两个相似SQL的查询结果，以前未曾注意
select a.*, case when x.resno is null then 0 else 1 end as isown from prm_res a
left join
(select b.resno from prm_res b
inner join prmg_role_res c on b.resno=c.resno
inner join prmg_acct_role d on d.roleno=c.roleno and d.acct=1
) as x
on a.resno=x.resno where a.sysno=1;
select a.*, case when x.resno is null then 0 else 1 end as isown from prm_res a
left join
(select b.resno from prm_res b
inner join prmg_role_res c on b.resno=c.resno
inner join prmg_acct_role d on d.roleno=c.roleno and d.acct=1
) as x
on a.resno=x.resno and a.sysno=1;
谁知道啥情况？欢迎留言
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原文：http://lavasoft.blog.51cto.com/62575/1941135