聚合函数
更新时间：2024-02-21
GaiaDB-X 支持的函数，如下：
| 函数名 | 描述 |
|---|---|
| COUNT() | Return a count of the number of rows returned |
| COUNT(DISTINCT) | Return the count of a number of different values |
| MAX() | Return the maximum value |
| MIN() | Return the minimum value |
| SUM() | Return the sum |
相比MySQL5.7，GaiaDB-X暂不支持的函数，如下
| 函数名 | 描述 |
|---|---|
| AVG() | Return the average value of the argument |
| BIT_AND() | Return bitwise AND |
| BIT_OR() | Return bitwise OR |
| BIT_XOR() | Return bitwise XOR |
| JSON_ARRAYAGG() (introduced 5.7.22) | Return result set as a single JSON array |
| JSON_OBJECTAGG() (introduced 5.7.22) | Return result set as a single JSON object |
| STD() | Return the population standard deviation |
| STDDEV() | Return the population standard deviation |
| STDDEV_POP() | Return the population standard deviation |
| STDDEV_SAMP() | Return the sample standard deviation |
| VAR_POP() | Return the population standard variance |
| VAR_SAMP() | Return the sample variance |
| VARIANCE() | Return the population standard variance |