Every derived table must have its own alias（sql语句错误解决方法）

时间：2025-02-13 22:32:26

  • 在做多表查询，或者查询的时候产生新的表的时候会出现这个错误：Every derived table must have its own alias（每一个派生出来的表都必须有一个自己的别名）。

  • eg：

  •  delete from stock   
where (org_id,material_id,state) 
in  (SELECT * from 
(select org_id,material_id, state from stock WHERE state = 1 group by org_id,material_id,state having count(*) > 1)
)

  • 当执行这条sql语句的时候就会出现Every derived table must have its own alias；

  • 这条sql：

  • (select org_id,material_id, state from stock WHERE state = 1 group by org_id,material_id,state having count(*) > 1)

  • 就会产生一张新的表，和前面的表stock联合查询，但是mysql要求每一个派生出来的表都必须有一个自己的别名，那我给派生表加上别名即可；

  • eg：修改后的sql，直接在新生产的表中加入 他的别命名就行（“as a”或者“a”），“a”为新表的别名

  •  delete from stock   
where (org_id,material_id,state) in  
(SELECT * from (select org_id,material_id, state 
from stock WHERE state = 1 group by org_id,material_id,state having count(*) > 1) as a )

  • 这样就解决了问题；

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