数学函数
DRDS 支持如下数学函数：
| 函数名 | 描述 |
|---|---|
| ABS() | Return the absolute value |
| ACOS() | Return the arc cosine |
| ASIN() | Return the arc sine |
| ATAN() | Return the arc tangent |
| ATAN2(), ATAN() | Return the arc tangent of the two arguments |
| CEIL() | Return the smallest integer value not less than the argument |
| CEILING() | Return the smallest integer value not less than the argument |
| CONV() | Convert numbers between different number bases |
| COS() | Return the cosine |
| COT() | Return the cotangent |
| CRC32() | Compute a cyclic redundancy check value |
| DEGREES() | Convert radians to degrees |
| EXP() | Raise to the power of |
| FLOOR() | Return the largest integer value not greater than the argument |
| LN() | Return the natural logarithm of the argument |
| LOG() | Return the natural logarithm of the first argument |
| LOG10() | Return the base-10 logarithm of the argument |
| LOG2() | Return the base-2 logarithm of the argument |
| MOD() | Return the remainder |
| PI() | Return the value of pi |
| POW() | Return the argument raised to the specified power |
| POWER() | Return the argument raised to the specified power |
| RAND() | Return a random floating-point value |
| ROUND() | Round the argument |
| SIGN() | Return the sign of the argument |
| SIN() | Return the sine of the argument |
| SQRT() | Return the square root of the argument |
| TAN() | Return the tangent of the argument |
| TRUNCATE() | Truncate to specified number of decimal places |
不支持函数列表
与 MySQL5.7 相比，DRDS 暂不支持如下数学函数：
| 函数名 | 描述 |
|---|---|
| RADIANS() | Return argument converted to radians |
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