Question

我有4张桌子：

人员
yes_vote - ＆gt;那些投票赞成是＆＃39;
no_vote - ＆gt;那些投票的人员没有＆＃39;
not_voted - ＆gt;尚未投票的官员

我做了什么：

检查该人员是否存在于yes_vote。

现有数据不会显示为yes_vote的选项。

SELECT * 
FROM officers 
WHERE uuid NOT IN (SELECT officer_uuid 
                  FROM ".$table_vote." v 
                  WHERE v.resolution_uuid = '".$resolution_uuid."')"

我必须做的事情：

检查该人员是否在三票表中。
如果官员已经包含在yes_vote中，则他/她不得在no_vote和not_voted中显示为选项，等等。

Answer 1

恕我直言，你的桌子结构错了但是......

如果要检查3个表中的并行存在：

SELECT * FROM officers o
WHERE EXISTS
    (SELECT 'YES' FROM yes_vote y WHERE y.officer_uuid = o.id AND y.resolution_id = 'YOUR_VAR')
AND EXISTS
    (SELECT 'NO' FROM no_vote n WHERE n.officer_uuid = o.id AND y.resolution_id = 'YOUR_VAR')
AND EXISTS
    (SELECT 'NOTVOTED' FROM not_voted nv WHERE nv.officer_uuid = o.id AND y.resolution_id = 'YOUR_VAR')

我建议你改变你的表结构，而不是3个不同的表，你可以用官员的投票创建一个表如下：

TABLE VOTE:

id (PK of vote table)
officer_uuid (FK to officers table)
resolution_uuid (FK to resolutions table)
vote_kind (with check Y, N, X)

Answer 2

1）检查该人员是否在三张选票表中

SELECT * FROM officers WHERE uuid IN (SELECT officer_uuid FROM yes_vote union SELECT officer_uuid FROM no_vote  union SELECT officer_uuid FROM not_voted )

2）如果官员已经包含在yes_vote中，则他/她不得在no_vote和not_voted中显示为选项，等等。

我认为你想要列出在多个表中有条目并且不应该发生的官员。假设您要查找在yes_vote和no_vote

中有多个条目的人员

select * from officers where uuid in (   SELECT officer_uuid  FROM yes_vote inner join no_vote on yes_vot.officer_uuid =no_vote.officer_uuid )

同样适用于not_voted

如果你想找到其他官员已经给出了他/她的投票，你可以使用以下查询

select if(b.uuid is null,'still not voted','already voted'),a.officer_name from officers  a left join  (SELECT officer_uuid as uuid FROM yes_vote union SELECT officer_uuid as uuid FROM no_vote  union SELECT officer_uuid as uuid FROM not_voted )b   on a.uuid =b.uuid

MySQL查询用于限制目的

2 个答案: