SQL 函数和运算符参考
下表列出了每个SQL函数和运算符，并提供了每个函数的简短说明。
MySQL
MySQL Group By 出错
MySQL Group By 查询出错 (1055): Expression #1 of SELECT list is not in GROUP BY clause and contains nonaggregated column 'rbac_auth_assignment.item_name' which is not functionally depe