add doc of ceiling

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

@@ -2,7 +2,7 @@
 
 ## **Description**
 
-The CEIL(X) function returns the smallest integer value not less than X.
+The CEIL(X) function returns the smallest integer value not less than X.Synonymous with [`CEILING()`](ceiling.md).
 
 ## **Syntax**
 

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

@@ -0,0 +1,65 @@
+# **CEILING()**
+
+## **Description**
+
+The CEILING(X) function returns the smallest integer value not less than X.Synonymous with [`CEIL()`](ceil.md).
+
+## **Syntax**
+
+```
+> CEILING(X)
+```
+
+## **Arguments**
+
+|  Arguments   | Description  |
+|  ----  | ----  |
+| X | Required. Any numeric data type supported now. |
+
+For exact-value numeric arguments, the return value has an exact-value numeric type. For floating-point arguments, the return value has a floating-point type.
+
+## **Examples**
+
+```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 @@ This document lists the functions supported in the latest version of MatrixOne.
 | [ACOS()](./Mathematical/acos.md)  | Used to find the cosine of a given value (expressed in radians)  |
 | [ATAN()](./Mathematical/atan.md)  | Used to find the arctangent of a given value (expressed in radians)|
 | [CEIL()](./Mathematical/ceil.md)  | Used to find the smallest integer that is not less than the argument.|
+| [CEILING()](./Mathematical/ceiling.md)  | Used to find the smallest integer that is not less than the argument.|
 | [COS()](./Mathematical/cos.md)    | Used to find the cosine of an input parameter (expressed in radians).|
 | [COT()](./Mathematical/cot.md)    | Used to find the cotangent value of the input parameter (expressed in radians). |
 | [EXP()](./Mathematical/exp.md)    | Used to find the exponent of number with the natural constant e as the base.|

mkdocs.yml

@@ -552,6 +552,7 @@ 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