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java
发表于 2018-4-28 19:40:53
join on 与 where
查询条件连接后,一定要加上where条件才起作用
SELECT a.name, b.age FROM table_a a left join table_b b on a.name=b.name where (a.status > 0 or a.status is null)
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join on 与 where