add doc of create-table-like (#1009)

matrixorigin · Apr 30, 2024 · 1740467 · 1740467
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diff --git a/...MatrixOne/Reference/SQL-Reference/Data-Definition-Language/create-table-like.md b/...MatrixOne/Reference/SQL-Reference/Data-Definition-Language/create-table-like.md
@@ -0,0 +1,72 @@
+# CREATE TABLE ... LIKE
+
+## 语法说明
+
+`CREATE TABLE ... LIKE` 根据另一个表的定义创建一个空表，它会复制原始表的结构，但不会复制原始表中存储的数据。
+
+## 语法结构
+
+```sql
+CREATE TABLE new_tbl LIKE orig_tbl;
+```
+
+## 示例
+
+```sql
+create table test1 (a int primary key, b varchar(5) unique key);
+create table test2 (a int primary key,b varchar(5) unique key,c double DEFAULT 0, d char,e int, foreign key(e) references foreign01(a), unique index(c,d));
+insert into test1 values (101,'abc'),(102,'def');
+insert into test2 values (1,'zs1',1,'a',101),(2,'zs2',2,'b',102);
+
+mysql> create table test3 like test2;
+Query OK, 0 rows affected (0.02 sec)
+
+mysql> show CREATE TABLE test2;
++-------+---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+
+| Table | Create Table                                                                                                                                                                                                                                                                                                                                            |
++-------+---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+
+| test2 | CREATE TABLE `test2` (
+`a` INT NOT NULL,
+`b` VARCHAR(5) DEFAULT NULL,
+`c` DOUBLE DEFAULT 0,
+`d` CHAR(1) DEFAULT NULL,
+`e` INT DEFAULT NULL,
+PRIMARY KEY (`a`),
+UNIQUE KEY `b` (`b`),
+UNIQUE KEY `c` (`c`,`d`),
+CONSTRAINT `018eb74f-38f3-7eb4-80c1-95d9c65de706` FOREIGN KEY (`e`) REFERENCES `foreign01` (`a`) ON DELETE RESTRICT ON UPDATE RESTRICT
+) |
++-------+---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+
+1 row in set (0.00 sec)
+
+mysql> show CREATE TABLE test3;
++-------+---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+
+| Table | Create Table                                                                                                                                                                                                                                                                                                                                            |
++-------+---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+
+| test3 | CREATE TABLE `test3` (
+`a` INT NOT NULL,
+`b` VARCHAR(5) DEFAULT null,
+`c` DOUBLE DEFAULT 0,
+`d` CHAR(1) DEFAULT null,
+`e` INT DEFAULT null,
+PRIMARY KEY (`a`),
+UNIQUE KEY `b` (`b`),
+UNIQUE KEY `c` (`c`,`d`),
+CONSTRAINT `018eb74f-38f3-7eb4-80c1-95d9c65de706` FOREIGN KEY (`e`) REFERENCES `foreign01` (`a`) ON DELETE RESTRICT ON UPDATE RESTRICT
+) |
++-------+---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+
+1 row in set (0.00 sec)
+
+mysql> select * from test2;
++------+------+------+------+------+
+| a    | b    | c    | d    | e    |
++------+------+------+------+------+
+|    1 | zs1  |    1 | a    |  101 |
+|    2 | zs2  |    2 | b    |  102 |
++------+------+------+------+------+
+2 rows in set (0.00 sec)
+
+mysql> select * from test3;
+Empty set (0.01 sec)
+
+```
diff --git a/mkdocs.yml b/mkdocs.yml
@@ -271,6 +271,7 @@ nav:
           - CREATE DATABASE: MatrixOne/Reference/SQL-Reference/Data-Definition-Language/create-database.md
           - CREATE INDEX: MatrixOne/Reference/SQL-Reference/Data-Definition-Language/create-index.md
           - CREATE TABLE: MatrixOne/Reference/SQL-Reference/Data-Definition-Language/create-table.md
+          - CREATE TABLE ... LIKE: MatrixOne/Reference/SQL-Reference/Data-Definition-Language/create-table-like.md         
           - CREATE EXTERNAL TABLE: MatrixOne/Reference/SQL-Reference/Data-Definition-Language/create-external-table.md
           - CREATE CLUSTER TABLE: MatrixOne/Reference/SQL-Reference/Data-Definition-Language/create-cluster-table.md
           - CREATE PUBLICATION: MatrixOne/Reference/SQL-Reference/Data-Definition-Language/create-publication.md