📅 最后修改于: 2020-11-20 06:50:39 🧑 作者: Mango
MySQL提供了多种功能，可满足多种算术目的。下表简要说明了每个功能：
| Functions | Description |
|---|---|
| ABS() | The ABS() function returns the absolute value of the specified number. |
| ACOS() | The ACOS() function is used to get the arc cosine of the given number. |
| SIGN() | The SIGN() function is used to get a sign of the specified number. |
| SIN() | The SIN() function is used to get the sine value of the given number. |
| SQRT() | The SQRT() function is used to get the square root of the given number. |
| SUM() | This function is used to sum the values of given expressions. |
| TAN() | The TAN() function is used to get the tangent of the given number |
| TRUNCATE() | The TRUNCATE() function is used to get the given number truncated up to given certain decimal places. |
| ASIN() | The ASIN() function is used to get the arc sine of the given number. |
| ATAN2() | The ATAN2 function is used to get the arc tangent of the specified numbers n and m. |
| ATAN() | The ATAN() function is used to get the arc tangent of the specified number. |
| AVG() | The AVG() function is used to get the average value from the given expression. |
| CEIL() | The CEIL() function returns the smallest value which is greater than or equal to the specified number. |
| CEILING() | The CEILING() function returns the smallest value which is greater than or equal to the given number. |
| COS() | The COS() function is used to get the cosine of the given number. |
| COT() | The COT() function is used to get the cotangent of the given number. |
| COUNT() | The COUNT() function is used to get the total count for the specified column of the table. |
| DEGREES() | DEGREES() function is used to convert the given radian number into a degree. |
| DIV() | The DIV() function is used to find the integer division by dividing the number n by the number m. |
| EXP() | The EXP() function is used to find e raised to the power of number i.e. enumber. |
| FLOOR() | The FLOOR() function is used to find the greatest integer which is equal to or less than the specified number. |
| GREATEST() | The GREATEST() function is used to get the largest number from the list. |
| LEAST() | The LEAST() function is used to get the smallest number from the list. |
| LN() | The LN() function is used to get the natural logarithm for the specified number. |
| LOG10() | The LOG10() function is used to get the base-10 logarithm for the specified number. |
| LOG() | The LOG() function is used to return either the natural logarithm of the given number if it has one parameter or specified base logarithm number if it has two parameters. |
| LOG2() | The LOG2() function is used to get the base-2 logarithm for the specified number. |
| MAX() | The MAX() function is used to get the maximum number of the given column name. |
| MIN() | The MIN() function is used to get the minimum number of the given column name. |
| MOD() | The MOD() function is used to get the remainder for the specified values. |
| PI() | The PI() function is used to get the value of pi upto 6 decimal places. |
| POWER() | The POWER() function is used to get the power for the specified values. |
| POW() | The POW function is used to get the power for the specified values. |
| RADIANS() | The RADIANS() function is used to convert the given degrees to radians. |
| RAND() | The RAND() function is used to generate the random number. |
| ROUND() | The ROUND() function is used to round off the specified number. |
select pi();
输出：
mysql> SELECT PI();
+----------+
| PI() |
+----------+
| 3.141593 |
+----------+
1 row in set (0.00 sec)
Select pow(3,2);
输出：
mysql> SELECT POW(3, 2);
+-----------+
| POW(3, 2) |
+-----------+
| 9 |
+-----------+
1 row in set (0.00 sec)
select 4 % 3;
输出：
mysql> SELECT 4 % 3;
+-------+
| 4 % 3 |
+-------+
| 1 |
+-------+
1 row in set (0.00 sec)