sql语句如下
SELECT * FROM
(SELECT a.CHARGE_TYPE as 复选框扣费类型 FROM a -- 特意弄个字段
UNION ALL
SELECT a.CHARGE_TYPE as 复选框扣费类型 FROM a
)
WHERE a.id='129' and 复选框扣费类型 != 'PROMOTION' -- 在外面做条件用
错误解析:
Every derived table must have its own alias
每个派生表必须有自己的别名
说白了就是,最外面的select(派生表)没有表名,他不知道查哪个表,此时应该给他个虚拟表名,如 haha
SELECT * FROM
(SELECT a.CHARGE_TYPE as 复选框扣费类型 FROM a
UNION ALL
SELECT a.CHARGE_TYPE as 复选框扣费类型 FROM a
)
as haha WHERE a.id='129' and 复选框扣费类型 != 'PROMOTION' -- 加个别名,就不报错了。