diff --git a/README.md b/README.md
new file mode 100644
index 0000000..742515f
--- /dev/null
+++ b/README.md
@@ -0,0 +1,77 @@
+## Banco de dados de Alunos, Cursos e Disciplinas
+
+##### Modelagem de um banco de dados relacional de estudantes de uma universidade, assim como a inserção de dados de dois arquivos CSV (um para os [cursos](courses.csv) e outro para os [alunos](students.csv)) utilizando [script BASH shell](insert_data.sh) , e também a consulta de informações através de queries, em [outro script BASH shell](students_info.sh).
+
+Utilizando o PostgreSQL construi esse banco de dados seguindo o seguinte modelo:
+
+![modelo](images/bd_model.png)
+
+Para a inserção dos dados, desenvolvi um script shell, que lê arquivos CSV enquanto salva em variáveis e depois insere no banco de dados em loop:
+```
+# Exemplo da inserção dos cursos(o método para as disciplinas e alunos é o mesmo):
+
+PSQL="psql -X --username=freecodecamp --dbname=students --no-align --tuples-only -c"
+
+cat courses.csv | while IFS="," read MAJOR COURSE
+do
+  if [[ $MAJOR != "major" ]]
+  then
+    # get major_id
+    MAJOR_ID=$($PSQL "SELECT major_id FROM majors WHERE major='$MAJOR'")
+
+    # if not found
+    if [[ -z $MAJOR_ID ]]
+    then
+      # insert major
+      INSERT_MAJOR_RESULT=$($PSQL "INSERT INTO majors(major) VALUES('$MAJOR')")
+      if [[ $INSERT_MAJOR_RESULT == "INSERT 0 1" ]]
+      then
+        echo Inserted into majors, $MAJOR
+      fi
+
+      # get new major_id
+      MAJOR_ID=$($PSQL "SELECT major_id FROM majors WHERE major='$MAJOR'")
+    fi
+
+```
+Após a execução do script, as tabelas ficaram populadas assim:
+
+ - tabelas de cursos e disciplinas:
+ ![cursos_e_disciplinas](images/tables_1.png)
+
+ - tabelas de alunos:
+ ![alunos](images/tables_2.png)
+
+ - tabela de relação curso_disciplina:
+ ![cursos_disciplina](images/tables_3.png)
+
+
+---
+
+
+###### Consulta de informações utilizando queries SQL:
+
+Para consultar dados significativos com queries SQL, também desenvolvi um [script shell que realiza as queries](students_info.sh). O output no terminal desse script ficou assim:
+
+![querie1](images/query_1.png)
+![querie2](images/query_2.png)
+![querie3](images/query_3.png)
+
+
+---
+
+Com esse projeto eu aprendi MUITO, manipulação de arquivos com BASH, além de piping, comparações numéricas, comparações de string, execução de expressões, variáveis e muito mais... E isso só de bash scripting...
+
+Sobre SQL eu realmente adquiri expertise em queries, e utilizei diversas funções, JOINs, ordenação, agrupamento e bem mais.
+
+E o mais importante de tudo, eu me diverti pra caramba com esse projeto! 
+
+Para aqueles que possuem um ambiente linux e quiserem ver esse projeto em sua máquina, siga os passos a seguir:
+
+> 1. Instale o postgreSQL em sua máquina
+>
+> 2. insira o comando `psql students < students.sql` que vai ciar o BD sem os dados ou `psql students < students_full.sql` que já cria o BD populado!
+>
+> 3. Caso tenha criado só o modelo sem os dados, execute o script que insere os dados `./insert_data.sh`
+>
+> 4. Agora finalmente, execute o script com as queries `./students_info.sh`
diff --git a/courses.csv b/courses.csv
new file mode 100644
index 0000000..c582d99
--- /dev/null
+++ b/courses.csv
@@ -0,0 +1,29 @@
+major,course
+Database Administration,Data Structures and Algorithms
+Web Development,Web Programming
+Database Administration,Database Systems
+Data Science,Data Structures and Algorithms
+Network Engineering,Computer Networks
+Database Administration,SQL
+Data Science,Machine Learning
+Network Engineering,Computer Systems
+Computer Programming,Computer Networks
+Database Administration,Web Applications
+Game Design,Artificial Intelligence
+Data Science,Python
+Computer Programming,Object-Oriented Programming
+System Administration,Computer Systems
+Game Design,Calculus
+Web Development,Data Structures and Algorithms
+Data Science,Calculus
+Web Development,Object-Oriented Programming
+Game Design,Game Architecture
+System Administration,Computer Networks
+Game Design,Algorithms
+System Administration,UNIX
+System Administration,Server Administration
+Computer Programming,Computer Systems
+Computer Programming,Python
+Network Engineering,Network Security
+Web Development,Web Applications
+Network Engineering,Algorithms
diff --git a/images/bd_model.png b/images/bd_model.png
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diff --git a/images/tables_2.png b/images/tables_2.png
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diff --git a/images/tables_3.png b/images/tables_3.png
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diff --git a/insert_data.sh b/insert_data.sh
new file mode 100644
index 0000000..1b62f51
--- /dev/null
+++ b/insert_data.sh
@@ -0,0 +1,76 @@
+#!/bin/bash
+
+# Script to insert data from courses.csv and students.csv into students database
+
+PSQL="psql -X --username=freecodecamp --dbname=students --no-align --tuples-only -c"
+echo $($PSQL "TRUNCATE students, majors, courses, majors_courses")
+
+cat courses.csv | while IFS="," read MAJOR COURSE
+do
+  if [[ $MAJOR != "major" ]]
+  then
+    # get major_id
+    MAJOR_ID=$($PSQL "SELECT major_id FROM majors WHERE major='$MAJOR'")
+
+    # if not found
+    if [[ -z $MAJOR_ID ]]
+    then
+      # insert major
+      INSERT_MAJOR_RESULT=$($PSQL "INSERT INTO majors(major) VALUES('$MAJOR')")
+      if [[ $INSERT_MAJOR_RESULT == "INSERT 0 1" ]]
+      then
+        echo Inserted into majors, $MAJOR
+      fi
+
+      # get new major_id
+      MAJOR_ID=$($PSQL "SELECT major_id FROM majors WHERE major='$MAJOR'")
+    fi
+
+    # get course_id
+    COURSE_ID=$($PSQL "SELECT course_id FROM courses WHERE course='$COURSE'")
+
+    # if not found
+    if [[ -z $COURSE_ID ]]
+    then
+      # insert course
+      INSERT_COURSE_RESULT=$($PSQL "INSERT INTO courses(course) VALUES('$COURSE')")
+      if [[ $INSERT_COURSE_RESULT == "INSERT 0 1" ]]
+      then
+        echo Inserted into courses, $COURSE
+      fi
+
+      # get new course_id
+      COURSE_ID=$($PSQL "SELECT course_id FROM courses WHERE course='$COURSE'")
+    fi
+
+    # insert into majors_courses
+    INSERT_MAJORS_COURSES_RESULT=$($PSQL "INSERT INTO majors_courses(major_id, course_id) VALUES($MAJOR_ID, $COURSE_ID)")
+    if [[ $INSERT_MAJORS_COURSES_RESULT == "INSERT 0 1" ]]
+    then
+      echo Inserted into majors_courses, $MAJOR : $COURSE
+    fi
+  fi
+done
+
+cat students.csv | while IFS="," read FIRST LAST MAJOR GPA
+do
+  if [[ $FIRST != "first_name" ]]
+  then
+    # get major_id
+    MAJOR_ID=$($PSQL "SELECT major_id FROM majors WHERE major='$MAJOR'") 
+
+    # if not found
+    if [[ -z $MAJOR_ID ]]
+    then
+      # set to null
+      MAJOR_ID=null
+    fi
+
+    # insert student
+    INSERT_STUDENT_RESULT=$($PSQL "INSERT INTO students(first_name, last_name, major_id, gpa) VALUES('$FIRST', '$LAST', $MAJOR_ID, $GPA)")
+    if [[ $INSERT_STUDENT_RESULT == "INSERT 0 1" ]]
+    then
+      echo Inserted into students, $FIRST $LAST
+    fi
+  fi
+done
\ No newline at end of file
diff --git a/students.csv b/students.csv
new file mode 100644
index 0000000..8447fdb
--- /dev/null
+++ b/students.csv
@@ -0,0 +1,32 @@
+first_name,last_name,major,gpa
+Rhea,Kellems,Database Administration,2.5
+Emma,Gilbert,null,null
+Kimberly,Whitley,Web Development,3.8
+Jimmy,Felipe,Database Administration,3.7
+Kyle,Stimson,null,2.8
+Casares,Hijo,Game Design,4.0
+Noe,Savage,null,3.6
+Sterling,Boss,Game Design,3.9
+Brian,Davis,null,2.3
+Kaija,Uronen,Game Design,3.7
+Faye,Conn,Game Design,2.1
+Efren,Reilly,Web Development,3.9
+Danh,Nhung,null,2.4
+Maxine,Hagenes,Database Administration,2.9
+Larry,Saunders,Data Science,2.2
+Karl,Kuhar,Web Development,null
+Lieke,Hazenveld,Game Design,3.5
+Obie,Hilpert,Web Development,null
+Peter,Booysen,null,2.9
+Nathan,Turner,Database Administration,3.3
+Gerald,Osiki,Data Science,2.2
+Vanya,Hassanah,Game Design,4.0
+Roxelana,Florescu,Database Administration,3.2
+Helene,Parker,Data Science,3.4
+Mariana,Russel,Web Development,1.8
+Ajit,Dhungel,null,3.0
+Mehdi,Vandenberghe,Database Administration,1.9
+Dejon,Howell,Web Development,4.0
+Aliya,Gulgowski,System Administration,2.6
+Ana,Tupajic,Data Science,3.1
+Hugo,Duran,null,3.8
diff --git a/students.sql b/students.sql
new file mode 100644
index 0000000..3af453f
--- /dev/null
+++ b/students.sql
@@ -0,0 +1,298 @@
+--
+-- PostgreSQL database dump
+--
+
+-- Dumped from database version 12.9 (Ubuntu 12.9-2.pgdg20.04+1)
+-- Dumped by pg_dump version 12.9 (Ubuntu 12.9-2.pgdg20.04+1)
+
+SET statement_timeout = 0;
+SET lock_timeout = 0;
+SET idle_in_transaction_session_timeout = 0;
+SET client_encoding = 'UTF8';
+SET standard_conforming_strings = on;
+SELECT pg_catalog.set_config('search_path', '', false);
+SET check_function_bodies = false;
+SET xmloption = content;
+SET client_min_messages = warning;
+SET row_security = off;
+
+DROP DATABASE students;
+--
+-- Name: students; Type: DATABASE; Schema: -; Owner: freecodecamp
+--
+
+CREATE DATABASE students WITH TEMPLATE = template0 ENCODING = 'UTF8' LC_COLLATE = 'C.UTF-8' LC_CTYPE = 'C.UTF-8';
+
+
+ALTER DATABASE students OWNER TO freecodecamp;
+
+\connect students
+
+SET statement_timeout = 0;
+SET lock_timeout = 0;
+SET idle_in_transaction_session_timeout = 0;
+SET client_encoding = 'UTF8';
+SET standard_conforming_strings = on;
+SELECT pg_catalog.set_config('search_path', '', false);
+SET check_function_bodies = false;
+SET xmloption = content;
+SET client_min_messages = warning;
+SET row_security = off;
+
+SET default_tablespace = '';
+
+SET default_table_access_method = heap;
+
+--
+-- Name: courses; Type: TABLE; Schema: public; Owner: freecodecamp
+--
+
+CREATE TABLE public.courses (
+    course_id integer NOT NULL,
+    course character varying(100) NOT NULL
+);
+
+
+ALTER TABLE public.courses OWNER TO freecodecamp;
+
+--
+-- Name: courses_course_id_seq; Type: SEQUENCE; Schema: public; Owner: freecodecamp
+--
+
+CREATE SEQUENCE public.courses_course_id_seq
+    AS integer
+    START WITH 1
+    INCREMENT BY 1
+    NO MINVALUE
+    NO MAXVALUE
+    CACHE 1;
+
+
+ALTER TABLE public.courses_course_id_seq OWNER TO freecodecamp;
+
+--
+-- Name: courses_course_id_seq; Type: SEQUENCE OWNED BY; Schema: public; Owner: freecodecamp
+--
+
+ALTER SEQUENCE public.courses_course_id_seq OWNED BY public.courses.course_id;
+
+
+--
+-- Name: majors; Type: TABLE; Schema: public; Owner: freecodecamp
+--
+
+CREATE TABLE public.majors (
+    major_id integer NOT NULL,
+    major character varying(50) NOT NULL
+);
+
+
+ALTER TABLE public.majors OWNER TO freecodecamp;
+
+--
+-- Name: majors_courses; Type: TABLE; Schema: public; Owner: freecodecamp
+--
+
+CREATE TABLE public.majors_courses (
+    major_id integer NOT NULL,
+    course_id integer NOT NULL
+);
+
+
+ALTER TABLE public.majors_courses OWNER TO freecodecamp;
+
+--
+-- Name: majors_major_id_seq; Type: SEQUENCE; Schema: public; Owner: freecodecamp
+--
+
+CREATE SEQUENCE public.majors_major_id_seq
+    AS integer
+    START WITH 1
+    INCREMENT BY 1
+    NO MINVALUE
+    NO MAXVALUE
+    CACHE 1;
+
+
+ALTER TABLE public.majors_major_id_seq OWNER TO freecodecamp;
+
+--
+-- Name: majors_major_id_seq; Type: SEQUENCE OWNED BY; Schema: public; Owner: freecodecamp
+--
+
+ALTER SEQUENCE public.majors_major_id_seq OWNED BY public.majors.major_id;
+
+
+--
+-- Name: students; Type: TABLE; Schema: public; Owner: freecodecamp
+--
+
+CREATE TABLE public.students (
+    student_id integer NOT NULL,
+    first_name character varying(50) NOT NULL,
+    last_name character varying(50) NOT NULL,
+    major_id integer,
+    gpa numeric(2,1)
+);
+
+
+ALTER TABLE public.students OWNER TO freecodecamp;
+
+--
+-- Name: students_student_id_seq; Type: SEQUENCE; Schema: public; Owner: freecodecamp
+--
+
+CREATE SEQUENCE public.students_student_id_seq
+    AS integer
+    START WITH 1
+    INCREMENT BY 1
+    NO MINVALUE
+    NO MAXVALUE
+    CACHE 1;
+
+
+ALTER TABLE public.students_student_id_seq OWNER TO freecodecamp;
+
+--
+-- Name: students_student_id_seq; Type: SEQUENCE OWNED BY; Schema: public; Owner: freecodecamp
+--
+
+ALTER SEQUENCE public.students_student_id_seq OWNED BY public.students.student_id;
+
+
+--
+-- Name: courses course_id; Type: DEFAULT; Schema: public; Owner: freecodecamp
+--
+
+ALTER TABLE ONLY public.courses ALTER COLUMN course_id SET DEFAULT nextval('public.courses_course_id_seq'::regclass);
+
+
+--
+-- Name: majors major_id; Type: DEFAULT; Schema: public; Owner: freecodecamp
+--
+
+ALTER TABLE ONLY public.majors ALTER COLUMN major_id SET DEFAULT nextval('public.majors_major_id_seq'::regclass);
+
+
+--
+-- Name: students student_id; Type: DEFAULT; Schema: public; Owner: freecodecamp
+--
+
+ALTER TABLE ONLY public.students ALTER COLUMN student_id SET DEFAULT nextval('public.students_student_id_seq'::regclass);
+
+
+--
+-- Data for Name: courses; Type: TABLE DATA; Schema: public; Owner: freecodecamp
+--
+
+INSERT INTO public.courses VALUES (17, 'Data Structures and Algorithms');
+INSERT INTO public.courses VALUES (18, 'Web Programming');
+INSERT INTO public.courses VALUES (19, 'Database Systems');
+
+
+--
+-- Data for Name: majors; Type: TABLE DATA; Schema: public; Owner: freecodecamp
+--
+
+INSERT INTO public.majors VALUES (30, 'Database Administration');
+INSERT INTO public.majors VALUES (31, 'Web Development');
+INSERT INTO public.majors VALUES (32, 'Data Science');
+
+
+--
+-- Data for Name: majors_courses; Type: TABLE DATA; Schema: public; Owner: freecodecamp
+--
+
+INSERT INTO public.majors_courses VALUES (30, 17);
+INSERT INTO public.majors_courses VALUES (31, 18);
+INSERT INTO public.majors_courses VALUES (30, 19);
+INSERT INTO public.majors_courses VALUES (32, 17);
+
+
+--
+-- Data for Name: students; Type: TABLE DATA; Schema: public; Owner: freecodecamp
+--
+
+
+
+--
+-- Name: courses_course_id_seq; Type: SEQUENCE SET; Schema: public; Owner: freecodecamp
+--
+
+SELECT pg_catalog.setval('public.courses_course_id_seq', 19, true);
+
+
+--
+-- Name: majors_major_id_seq; Type: SEQUENCE SET; Schema: public; Owner: freecodecamp
+--
+
+SELECT pg_catalog.setval('public.majors_major_id_seq', 32, true);
+
+
+--
+-- Name: students_student_id_seq; Type: SEQUENCE SET; Schema: public; Owner: freecodecamp
+--
+
+SELECT pg_catalog.setval('public.students_student_id_seq', 1, true);
+
+
+--
+-- Name: courses courses_pkey; Type: CONSTRAINT; Schema: public; Owner: freecodecamp
+--
+
+ALTER TABLE ONLY public.courses
+    ADD CONSTRAINT courses_pkey PRIMARY KEY (course_id);
+
+
+--
+-- Name: majors_courses majors_courses_pkey; Type: CONSTRAINT; Schema: public; Owner: freecodecamp
+--
+
+ALTER TABLE ONLY public.majors_courses
+    ADD CONSTRAINT majors_courses_pkey PRIMARY KEY (major_id, course_id);
+
+
+--
+-- Name: majors majors_pkey; Type: CONSTRAINT; Schema: public; Owner: freecodecamp
+--
+
+ALTER TABLE ONLY public.majors
+    ADD CONSTRAINT majors_pkey PRIMARY KEY (major_id);
+
+
+--
+-- Name: students students_pkey; Type: CONSTRAINT; Schema: public; Owner: freecodecamp
+--
+
+ALTER TABLE ONLY public.students
+    ADD CONSTRAINT students_pkey PRIMARY KEY (student_id);
+
+
+--
+-- Name: majors_courses majors_courses_course_id_fkey; Type: FK CONSTRAINT; Schema: public; Owner: freecodecamp
+--
+
+ALTER TABLE ONLY public.majors_courses
+    ADD CONSTRAINT majors_courses_course_id_fkey FOREIGN KEY (course_id) REFERENCES public.courses(course_id);
+
+
+--
+-- Name: majors_courses majors_courses_major_id_fkey; Type: FK CONSTRAINT; Schema: public; Owner: freecodecamp
+--
+
+ALTER TABLE ONLY public.majors_courses
+    ADD CONSTRAINT majors_courses_major_id_fkey FOREIGN KEY (major_id) REFERENCES public.majors(major_id);
+
+
+--
+-- Name: students students_major_id_fkey; Type: FK CONSTRAINT; Schema: public; Owner: freecodecamp
+--
+
+ALTER TABLE ONLY public.students
+    ADD CONSTRAINT students_major_id_fkey FOREIGN KEY (major_id) REFERENCES public.majors(major_id);
+
+
+--
+-- PostgreSQL database dump complete
+--
+
diff --git a/students_full.sql b/students_full.sql
new file mode 100644
index 0000000..6622dc1
--- /dev/null
+++ b/students_full.sql
@@ -0,0 +1,374 @@
+SELECT pg_terminate_backend(pg_stat_activity.pid)
+FROM pg_stat_activity
+WHERE usename = 'freecodecamp';
+
+--
+-- PostgreSQL database dump
+--
+
+-- Dumped from database version 12.6 (Debian 12.6-1.pgdg90+1)
+-- Dumped by pg_dump version 12.6 (Debian 12.6-1.pgdg90+1)
+
+SET statement_timeout = 0;
+SET lock_timeout = 0;
+SET idle_in_transaction_session_timeout = 0;
+SET client_encoding = 'UTF8';
+SET standard_conforming_strings = on;
+SELECT pg_catalog.set_config('search_path', '', false);
+SET check_function_bodies = false;
+SET xmloption = content;
+SET client_min_messages = warning;
+SET row_security = off;
+
+DROP DATABASE IF EXISTS students;
+--
+-- Name: students; Type: DATABASE; Schema: -; Owner: freecodecamp
+--
+
+CREATE DATABASE students WITH TEMPLATE = template0 ENCODING = 'UTF8' LC_COLLATE = 'C.UTF-8' LC_CTYPE = 'C.UTF-8';
+
+
+ALTER DATABASE students OWNER TO freecodecamp;
+
+\connect students
+
+SET statement_timeout = 0;
+SET lock_timeout = 0;
+SET idle_in_transaction_session_timeout = 0;
+SET client_encoding = 'UTF8';
+SET standard_conforming_strings = on;
+SELECT pg_catalog.set_config('search_path', '', false);
+SET check_function_bodies = false;
+SET xmloption = content;
+SET client_min_messages = warning;
+SET row_security = off;
+
+SET default_tablespace = '';
+
+SET default_table_access_method = heap;
+
+--
+-- Name: courses; Type: TABLE; Schema: public; Owner: freecodecamp
+--
+
+CREATE TABLE public.courses (
+    course_id integer NOT NULL,
+    course character varying(100) NOT NULL
+);
+
+
+ALTER TABLE public.courses OWNER TO freecodecamp;
+
+--
+-- Name: courses_course_id_seq; Type: SEQUENCE; Schema: public; Owner: freecodecamp
+--
+
+CREATE SEQUENCE public.courses_course_id_seq
+    AS integer
+    START WITH 1
+    INCREMENT BY 1
+    NO MINVALUE
+    NO MAXVALUE
+    CACHE 1;
+
+
+ALTER TABLE public.courses_course_id_seq OWNER TO freecodecamp;
+
+--
+-- Name: courses_course_id_seq; Type: SEQUENCE OWNED BY; Schema: public; Owner: freecodecamp
+--
+
+ALTER SEQUENCE public.courses_course_id_seq OWNED BY public.courses.course_id;
+
+
+--
+-- Name: majors; Type: TABLE; Schema: public; Owner: freecodecamp
+--
+
+CREATE TABLE public.majors (
+    major_id integer NOT NULL,
+    major character varying(50) NOT NULL
+);
+
+
+ALTER TABLE public.majors OWNER TO freecodecamp;
+
+--
+-- Name: majors_courses; Type: TABLE; Schema: public; Owner: freecodecamp
+--
+
+CREATE TABLE public.majors_courses (
+    major_id integer NOT NULL,
+    course_id integer NOT NULL
+);
+
+
+ALTER TABLE public.majors_courses OWNER TO freecodecamp;
+
+--
+-- Name: majors_major_id_seq; Type: SEQUENCE; Schema: public; Owner: freecodecamp
+--
+
+CREATE SEQUENCE public.majors_major_id_seq
+    AS integer
+    START WITH 1
+    INCREMENT BY 1
+    NO MINVALUE
+    NO MAXVALUE
+    CACHE 1;
+
+
+ALTER TABLE public.majors_major_id_seq OWNER TO freecodecamp;
+
+--
+-- Name: majors_major_id_seq; Type: SEQUENCE OWNED BY; Schema: public; Owner: freecodecamp
+--
+
+ALTER SEQUENCE public.majors_major_id_seq OWNED BY public.majors.major_id;
+
+
+--
+-- Name: students; Type: TABLE; Schema: public; Owner: freecodecamp
+--
+
+CREATE TABLE public.students (
+    student_id integer NOT NULL,
+    first_name character varying(50) NOT NULL,
+    last_name character varying(50) NOT NULL,
+    major_id integer,
+    gpa numeric(2,1)
+);
+
+
+ALTER TABLE public.students OWNER TO freecodecamp;
+
+--
+-- Name: students_student_id_seq; Type: SEQUENCE; Schema: public; Owner: freecodecamp
+--
+
+CREATE SEQUENCE public.students_student_id_seq
+    AS integer
+    START WITH 1
+    INCREMENT BY 1
+    NO MINVALUE
+    NO MAXVALUE
+    CACHE 1;
+
+
+ALTER TABLE public.students_student_id_seq OWNER TO freecodecamp;
+
+--
+-- Name: students_student_id_seq; Type: SEQUENCE OWNED BY; Schema: public; Owner: freecodecamp
+--
+
+ALTER SEQUENCE public.students_student_id_seq OWNED BY public.students.student_id;
+
+
+--
+-- Name: courses course_id; Type: DEFAULT; Schema: public; Owner: freecodecamp
+--
+
+ALTER TABLE ONLY public.courses ALTER COLUMN course_id SET DEFAULT nextval('public.courses_course_id_seq'::regclass);
+
+
+--
+-- Name: majors major_id; Type: DEFAULT; Schema: public; Owner: freecodecamp
+--
+
+ALTER TABLE ONLY public.majors ALTER COLUMN major_id SET DEFAULT nextval('public.majors_major_id_seq'::regclass);
+
+
+--
+-- Name: students student_id; Type: DEFAULT; Schema: public; Owner: freecodecamp
+--
+
+ALTER TABLE ONLY public.students ALTER COLUMN student_id SET DEFAULT nextval('public.students_student_id_seq'::regclass);
+
+
+--
+-- Data for Name: courses; Type: TABLE DATA; Schema: public; Owner: freecodecamp
+--
+
+INSERT INTO public.courses VALUES (23, 'Data Structures and Algorithms');
+INSERT INTO public.courses VALUES (24, 'Web Programming');
+INSERT INTO public.courses VALUES (25, 'Database Systems');
+INSERT INTO public.courses VALUES (26, 'Computer Networks');
+INSERT INTO public.courses VALUES (27, 'SQL');
+INSERT INTO public.courses VALUES (28, 'Machine Learning');
+INSERT INTO public.courses VALUES (29, 'Computer Systems');
+INSERT INTO public.courses VALUES (30, 'Web Applications');
+INSERT INTO public.courses VALUES (31, 'Artificial Intelligence');
+INSERT INTO public.courses VALUES (32, 'Python');
+INSERT INTO public.courses VALUES (33, 'Object-Oriented Programming');
+INSERT INTO public.courses VALUES (34, 'Calculus');
+INSERT INTO public.courses VALUES (35, 'Game Architecture');
+INSERT INTO public.courses VALUES (36, 'Algorithms');
+INSERT INTO public.courses VALUES (37, 'UNIX');
+INSERT INTO public.courses VALUES (38, 'Server Administration');
+INSERT INTO public.courses VALUES (39, 'Network Security');
+
+
+--
+-- Data for Name: majors; Type: TABLE DATA; Schema: public; Owner: freecodecamp
+--
+
+INSERT INTO public.majors VALUES (36, 'Database Administration');
+INSERT INTO public.majors VALUES (37, 'Web Development');
+INSERT INTO public.majors VALUES (38, 'Data Science');
+INSERT INTO public.majors VALUES (39, 'Network Engineering');
+INSERT INTO public.majors VALUES (40, 'Computer Programming');
+INSERT INTO public.majors VALUES (41, 'Game Design');
+INSERT INTO public.majors VALUES (42, 'System Administration');
+
+
+--
+-- Data for Name: majors_courses; Type: TABLE DATA; Schema: public; Owner: freecodecamp
+--
+
+INSERT INTO public.majors_courses VALUES (36, 23);
+INSERT INTO public.majors_courses VALUES (37, 24);
+INSERT INTO public.majors_courses VALUES (36, 25);
+INSERT INTO public.majors_courses VALUES (38, 23);
+INSERT INTO public.majors_courses VALUES (39, 26);
+INSERT INTO public.majors_courses VALUES (36, 27);
+INSERT INTO public.majors_courses VALUES (38, 28);
+INSERT INTO public.majors_courses VALUES (39, 29);
+INSERT INTO public.majors_courses VALUES (40, 26);
+INSERT INTO public.majors_courses VALUES (36, 30);
+INSERT INTO public.majors_courses VALUES (41, 31);
+INSERT INTO public.majors_courses VALUES (38, 32);
+INSERT INTO public.majors_courses VALUES (40, 33);
+INSERT INTO public.majors_courses VALUES (42, 29);
+INSERT INTO public.majors_courses VALUES (41, 34);
+INSERT INTO public.majors_courses VALUES (37, 23);
+INSERT INTO public.majors_courses VALUES (38, 34);
+INSERT INTO public.majors_courses VALUES (37, 33);
+INSERT INTO public.majors_courses VALUES (41, 35);
+INSERT INTO public.majors_courses VALUES (42, 26);
+INSERT INTO public.majors_courses VALUES (41, 36);
+INSERT INTO public.majors_courses VALUES (42, 37);
+INSERT INTO public.majors_courses VALUES (42, 38);
+INSERT INTO public.majors_courses VALUES (40, 29);
+INSERT INTO public.majors_courses VALUES (40, 32);
+INSERT INTO public.majors_courses VALUES (39, 39);
+INSERT INTO public.majors_courses VALUES (37, 30);
+INSERT INTO public.majors_courses VALUES (39, 36);
+
+
+--
+-- Data for Name: students; Type: TABLE DATA; Schema: public; Owner: freecodecamp
+--
+
+INSERT INTO public.students VALUES (6, 'Rhea', 'Kellems', 36, 2.5);
+INSERT INTO public.students VALUES (7, 'Emma', 'Gilbert', NULL, NULL);
+INSERT INTO public.students VALUES (8, 'Kimberly', 'Whitley', 37, 3.8);
+INSERT INTO public.students VALUES (9, 'Jimmy', 'Felipe', 36, 3.7);
+INSERT INTO public.students VALUES (10, 'Kyle', 'Stimson', NULL, 2.8);
+INSERT INTO public.students VALUES (11, 'Casares', 'Hijo', 41, 4.0);
+INSERT INTO public.students VALUES (12, 'Noe', 'Savage', NULL, 3.6);
+INSERT INTO public.students VALUES (13, 'Sterling', 'Boss', 41, 3.9);
+INSERT INTO public.students VALUES (14, 'Brian', 'Davis', NULL, 2.3);
+INSERT INTO public.students VALUES (15, 'Kaija', 'Uronen', 41, 3.7);
+INSERT INTO public.students VALUES (16, 'Faye', 'Conn', 41, 2.1);
+INSERT INTO public.students VALUES (17, 'Efren', 'Reilly', 37, 3.9);
+INSERT INTO public.students VALUES (18, 'Danh', 'Nhung', NULL, 2.4);
+INSERT INTO public.students VALUES (19, 'Maxine', 'Hagenes', 36, 2.9);
+INSERT INTO public.students VALUES (20, 'Larry', 'Saunders', 38, 2.2);
+INSERT INTO public.students VALUES (21, 'Karl', 'Kuhar', 37, NULL);
+INSERT INTO public.students VALUES (22, 'Lieke', 'Hazenveld', 41, 3.5);
+INSERT INTO public.students VALUES (23, 'Obie', 'Hilpert', 37, NULL);
+INSERT INTO public.students VALUES (24, 'Peter', 'Booysen', NULL, 2.9);
+INSERT INTO public.students VALUES (25, 'Nathan', 'Turner', 36, 3.3);
+INSERT INTO public.students VALUES (26, 'Gerald', 'Osiki', 38, 2.2);
+INSERT INTO public.students VALUES (27, 'Vanya', 'Hassanah', 41, 4.0);
+INSERT INTO public.students VALUES (28, 'Roxelana', 'Florescu', 36, 3.2);
+INSERT INTO public.students VALUES (29, 'Helene', 'Parker', 38, 3.4);
+INSERT INTO public.students VALUES (30, 'Mariana', 'Russel', 37, 1.8);
+INSERT INTO public.students VALUES (31, 'Ajit', 'Dhungel', NULL, 3.0);
+INSERT INTO public.students VALUES (32, 'Mehdi', 'Vandenberghe', 36, 1.9);
+INSERT INTO public.students VALUES (33, 'Dejon', 'Howell', 37, 4.0);
+INSERT INTO public.students VALUES (34, 'Aliya', 'Gulgowski', 42, 2.6);
+INSERT INTO public.students VALUES (35, 'Ana', 'Tupajic', 38, 3.1);
+INSERT INTO public.students VALUES (36, 'Hugo', 'Duran', NULL, 3.8);
+
+
+--
+-- Name: courses_course_id_seq; Type: SEQUENCE SET; Schema: public; Owner: freecodecamp
+--
+
+SELECT pg_catalog.setval('public.courses_course_id_seq', 39, true);
+
+
+--
+-- Name: majors_major_id_seq; Type: SEQUENCE SET; Schema: public; Owner: freecodecamp
+--
+
+SELECT pg_catalog.setval('public.majors_major_id_seq', 42, true);
+
+
+--
+-- Name: students_student_id_seq; Type: SEQUENCE SET; Schema: public; Owner: freecodecamp
+--
+
+SELECT pg_catalog.setval('public.students_student_id_seq', 36, true);
+
+
+--
+-- Name: courses courses_pkey; Type: CONSTRAINT; Schema: public; Owner: freecodecamp
+--
+
+ALTER TABLE ONLY public.courses
+    ADD CONSTRAINT courses_pkey PRIMARY KEY (course_id);
+
+
+--
+-- Name: majors_courses majors_courses_pkey; Type: CONSTRAINT; Schema: public; Owner: freecodecamp
+--
+
+ALTER TABLE ONLY public.majors_courses
+    ADD CONSTRAINT majors_courses_pkey PRIMARY KEY (major_id, course_id);
+
+
+--
+-- Name: majors majors_pkey; Type: CONSTRAINT; Schema: public; Owner: freecodecamp
+--
+
+ALTER TABLE ONLY public.majors
+    ADD CONSTRAINT majors_pkey PRIMARY KEY (major_id);
+
+
+--
+-- Name: students students_pkey; Type: CONSTRAINT; Schema: public; Owner: freecodecamp
+--
+
+ALTER TABLE ONLY public.students
+    ADD CONSTRAINT students_pkey PRIMARY KEY (student_id);
+
+
+--
+-- Name: majors_courses majors_courses_course_id_fkey; Type: FK CONSTRAINT; Schema: public; Owner: freecodecamp
+--
+
+ALTER TABLE ONLY public.majors_courses
+    ADD CONSTRAINT majors_courses_course_id_fkey FOREIGN KEY (course_id) REFERENCES public.courses(course_id);
+
+
+--
+-- Name: majors_courses majors_courses_major_id_fkey; Type: FK CONSTRAINT; Schema: public; Owner: freecodecamp
+--
+
+ALTER TABLE ONLY public.majors_courses
+    ADD CONSTRAINT majors_courses_major_id_fkey FOREIGN KEY (major_id) REFERENCES public.majors(major_id);
+
+
+--
+-- Name: students students_major_id_fkey; Type: FK CONSTRAINT; Schema: public; Owner: freecodecamp
+--
+
+ALTER TABLE ONLY public.students
+    ADD CONSTRAINT students_major_id_fkey FOREIGN KEY (major_id) REFERENCES public.majors(major_id);
+
+
+--
+-- PostgreSQL database dump complete
+--
\ No newline at end of file
diff --git a/students_info.sh b/students_info.sh
new file mode 100644
index 0000000..87c1cce
--- /dev/null
+++ b/students_info.sh
@@ -0,0 +1,40 @@
+#!/bin/bash
+
+# Info about my computer science students from students database
+
+echo -e "\n~~ My Computer Science Students ~~\n"
+
+PSQL="psql -X --username=freecodecamp --dbname=students --no-align --tuples-only -c"
+
+echo -e "\nFirst name, last name, and GPA of students with a 4.0 GPA:"
+echo "$($PSQL "SELECT first_name, last_name, gpa FROM students WHERE gpa = 4.0")"
+
+echo -e "\nAll course names whose first letter is before 'D' in the alphabet:"
+echo "$($PSQL "SELECT course FROM courses WHERE course < 'D'")"
+
+echo -e "\nFirst name, last name, and GPA of students whose last name begins with an 'R' or after and have a GPA greater than 3.8 or less than 2.0:"
+echo "$($PSQL "SELECT first_name, last_name, gpa FROM students WHERE last_name >= 'R' AND (gpa > 3.8 OR gpa < 2.0)")"
+
+echo -e "\nLast name of students whose last name contains a case insensitive 'sa' or have an 'r' as the second to last letter:"
+echo "$($PSQL "SELECT last_name FROM students WHERE last_name ILIKE '%sa%' OR last_name ILIKE '%r_'")"
+
+echo -e "\nFirst name, last name, and GPA of students who have not selected a major and either their first name begins with 'D' or they have a GPA greater than 3.0:"
+echo "$($PSQL "SELECT first_name, last_name, gpa FROM students WHERE major_id IS NULL AND (first_name LIKE 'D%' OR gpa > 3.0)")"
+
+echo -e "\nCourse name of the first five courses, in reverse alphabetical order, that have an 'e' as the second letter or end with an 's':"
+echo "$($PSQL "SELECT course FROM courses WHERE course LIKE '_e%' OR course LIKE '%s' ORDER BY course DESC LIMIT 5")"
+
+echo -e "\nAverage GPA of all students rounded to two decimal places:"
+echo "$($PSQL "SELECT ROUND(AVG(gpa), 2) FROM students")"
+
+echo -e "\nMajor ID, total number of students in a column named 'number_of_students', and average GPA rounded to two decimal places in a column name 'average_gpa', for each major ID in the students table having a student count greater than 1:"
+echo "$($PSQL "SELECT major_id, COUNT(*) AS number_of_students, ROUND(AVG(gpa), 2) AS average_gpa FROM students GROUP BY major_id HAVING COUNT(*) > 1")"
+
+echo -e "\nList of majors, in alphabetical order, that either no student is taking or has a student whose first name contains a case insensitive 'ma':"
+echo "$($PSQL "SELECT major FROM students FULL JOIN majors ON students.major_id = majors.major_id WHERE major IS NOT NULL AND (student_id IS NULL OR first_name ILIKE '%ma%') ORDER BY major")"
+
+echo -e "\nList of unique courses, in reverse alphabetical order, that no student or 'Obie Hilpert' is taking:"
+echo "$($PSQL "SELECT DISTINCT course FROM students FULL JOIN majors USING(major_id) FULL JOIN majors_courses USING(major_id) FULL JOIN courses USING(course_id) WHERE student_id IS NULL OR (first_name='Obie' AND last_name='Hilpert') ORDER BY course DESC")"
+
+echo -e "\nList of courses, in alphabetical order, with only one student enrolled:"
+echo "$($PSQL "SELECT course FROM students FULL JOIN majors USING(major_id) FULL JOIN majors_courses USING(major_id) FULL JOIN courses USING(course_id) GROUP BY course HAVING COUNT(student_id)=1 ORDER BY course  ")"