Merge pull request #1123 from yangj1211/ceiling

add doc of ceiling

docs/MatrixOne/Reference/Functions-and-Operators/Mathematical/ceil.md

@@ -2,7 +2,7 @@
 
 ## **函数说明**
 
-CEIL(X) 函数返回不小于 X 的最小整数。
+CEIL(X) 函数返回不小于 X 的最小整数。与 [`CEILING()`](ceiling.md) 同义。
 
 ## **函数语法**
 

docs/MatrixOne/Reference/Functions-and-Operators/Mathematical/ceiling.md

@@ -0,0 +1,65 @@
+# **ceiling()**
+
+## **函数说明**
+
+ceiling(X) 函数返回不小于 X 的最小整数。[`ceil()`](ceil.md) 同义。
+
+## **函数语法**
+
+```
+> ceiling(X)
+```
+
+## **参数释义**
+
+|  参数   | 说明  |
+|  ----  | ----  |
+| X | 必要参数，可取任意数值数据类型 |
+
+对 int 类的绝对数值类型，返回值也是相同的绝对数值类型。对浮点数来说，返回值也是浮点数。
+
+## **示例**
+
+```sql
+drop table if exists t1;
+create table t1(a int ,b float);
+insert into t1 values(1,0.5);
+insert into t1 values(2,0.499);
+insert into t1 values(3,0.501);
+insert into t1 values(4,20.5);
+insert into t1 values(5,20.499);
+insert into t1 values(6,13.500);
+insert into t1 values(7,-0.500);
+insert into t1 values(8,-0.499);
+insert into t1 values(9,-0.501);
+insert into t1 values(10,-20.499);
+insert into t1 values(11,-20.500);
+insert into t1 values(12,-13.500);
+
+mysql> select a,ceiling(b) from t1;
++------+------------+
+| a    | ceiling(b) |
++------+------------+
+|    1 |          1 |
+|    2 |          1 |
+|    3 |          1 |
+|    4 |         21 |
+|    5 |         21 |
+|    6 |         14 |
+|    7 |         -0 |
+|    8 |         -0 |
+|    9 |         -0 |
+|   10 |        -20 |
+|   11 |        -20 |
+|   12 |        -13 |
++------+------------+
+12 rows in set (0.00 sec)
+
+mysql> select sum(ceiling(b)) from t1;
++-----------------+
+| sum(ceiling(b)) |
++-----------------+
+|               6 |
++-----------------+
+1 row in set (0.01 sec)
+```

docs/MatrixOne/Reference/Functions-and-Operators/matrixone-function-list.md

@@ -66,6 +66,7 @@
 | [ACOS()](./Mathematical/acos.md)  | 用于求给定数值的余弦（用弧度表示）  |
 | [ATAN()](./Mathematical/atan.md)  | 用于求给定数值的反正切（用弧度表示）|
 | [CEIL()](./Mathematical/ceil.md)  | 用于求不小于参数的最小整数。|
+| [CEILING()](./Mathematical/ceiling.md)  | 用于求不小于参数的最小整数。|
 | [COS()](./Mathematical/cos.md)    | 用于求输入参数（用弧度表示）的余弦值。|
 | [COT()](./Mathematical/cot.md)    | 用于求输入参数（用弧度表示）的余切值。 |
 | [EXP()](./Mathematical/exp.md)    | 用于求以自然常数 e 为底的 number 的指数。|

mkdocs.yml

@@ -563,6 +563,7 @@ nav:
             - ACOS(): MatrixOne/Reference/Functions-and-Operators/Mathematical/acos.md
             - ATAN(): MatrixOne/Reference/Functions-and-Operators/Mathematical/atan.md
             - CEIL(): MatrixOne/Reference/Functions-and-Operators/Mathematical/ceil.md
+            - CEILING(): MatrixOne/Reference/Functions-and-Operators/Mathematical/ceiling.md
             - COS(): MatrixOne/Reference/Functions-and-Operators/Mathematical/cos.md
             - COT(): MatrixOne/Reference/Functions-and-Operators/Mathematical/cot.md
             - EXP(): MatrixOne/Reference/Functions-and-Operators/Mathematical/exp.md