如何用 sql 找出具有相同外键的 关系 - V2EX
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如何用 sql 找出具有相同外键的 关系

  •  
  •   ruandao 2020-01-16 21:44:05 +08:00 3214 次点击
    这是一个创建于 2170 天前的主题,其中的信息可能已经有所发展或是发生改变。

    mysql 中

    表(hell)的结构: fk_field_1, fk_field_2 

    然后想要找出

    fk_field_2 = (fk_field_2_1, fk_field_2_2, fk_field_2_3) 的 fk_field_1 要怎么写 sql 

    谢谢

    第 1 条附言    2020-01-17 14:50:45 +08:00

    找到解法了

    select * from Parents p where 3 = ( select Count(DISTINCT c.xId) from Child c where p.id = c.pid and c.xid in (4,5,6) ) 
    2 条回复    2020-01-17 12:47:21 +08:00
    tairan2006
        1
    tairan2006  
       2020-01-17 08:47:20 +08:00 via Android
    先 join 然后用 where 不就可以了?
    no1xsyzy
        2
    no1xsyzy  
       2020-01-17 12:47:21 +08:00
    你可以把老二插电风扇里
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