多么真实的工作是在SQL中对OR的句子进行倍增

Question

请知道我是如何工作或判刑的 以及哪个查询正确....

例如，在第一个条件

中

clause.append(" AND (     ( e.isConfidential = false ) ");

如果确实如此，其余的查询句子永远不会被执行？ 在这种情况下真的有用吗？

clause.append("  OR ( e.coordinatorId = (:userId) )");
clause.append("  OR ( e.status <> 'APPROVED' AND e.status <> 'CLOSED') ");
clause.append("  OR ( e.id IN (SELECT a.meetingId FROM Attendant a where a.userId = (:userId) ) )");

查询1。 ......

clause.append(" AND (     ( e.isConfidential = false ) ");
clause.append("        OR ( e.coordinatorId = (:userId) )");
clause.append("        OR ( e.status <> 'APPROVED' AND e.status <> 'CLOSED') ");
clause.append("        OR ( e.id IN (SELECT a.meetingId FROM Attendant a where a.userId = (:userId) ) )");
clause.append("      )  ");
queryParameters.put("userId", userId);

查询2 ......

clause.append(" AND (    ( e.isConfidential = false ) ");
clause.append("       OR ( (e.isConfidential = true) AND (e.coordinatorId =  (:userId)) )");
clause.append("       OR ( (e.isConfidential = true) AND (e.coordinatorId <> (:userId)) AND (e.status <> 'APPROVED') AND (e.status <> 'CLOSED')) ");
clause.append("       OR ( (e.isConfidential = true) AND (e.coordinatorId <> (:userId)) AND (e.status  = 'APPROVED') AND (e.status  = 'CLOSED') 
                            AND e.id IN (SELECT a.meetingId FROM Attendant a where a.userId = (:userId) ) )");
clause.append("      )  ");
queryParameters.put("userId", userId);

Answer 1

所以AND / OR逻辑的工作原理如下;

True AND True = True
True AND False = False
False AND False = False

True OR True = True
True OR False = True
False OR False = False

所以只需按部分解析每个位;

True AND (False OR (True AND (False OR True)))

与;相同;

True AND (False OR (True AND True))

与;相同;

True AND (False OR True)

与;相同;

True AND True

与;相同;

True

我不能评论查询是否正确，除非我理解它的用途 - 但是乍一看语法看起来还不错。

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