mysql in 子查询 效率慢，对比

SELECT id,detail,groupId from hs_knowledge_point where groupId in ( SELECT groupId from hs_knowledge_point where groupId>0 GROUP BY groupId HAVING COUNT(groupId) > 1 UNION all SELECT groupId from hs_knowledge_point_commit where groupId>0 GROUP BY groupId HAVING COUNT(groupId) > 1 ) UNION ALL SELECT id,detail,groupId from hs_knowledge_point_commit where groupId in ( SELECT groupId from hs_knowledge_point where groupId>0 GROUP BY groupId HAVING COUNT(groupId) > 1 UNION all SELECT groupId from hs_knowledge_point_commit where groupId>0 GROUP BY groupId HAVING COUNT(groupId) > 1 ) View Code

SELECT id,detail,groupId from hs_knowledge_point where groupId in (
    select groupId from (
        SELECT groupId from hs_knowledge_point where groupId>0 GROUP BY groupId HAVING COUNT(groupId) > 1 
        UNION all
        SELECT groupId from hs_knowledge_point_commit where groupId>0 GROUP BY groupId HAVING COUNT(groupId) > 1 
    ) tmp
)
UNION ALL
SELECT id,detail,groupId from hs_knowledge_point_commit where groupId in (
    select groupId from (
        SELECT groupId from hs_knowledge_point where groupId>0 GROUP BY groupId HAVING COUNT(groupId) > 1 
        UNION all
        SELECT groupId from hs_knowledge_point_commit where groupId>0 GROUP BY groupId HAVING COUNT(groupId) > 1 
    ) tmp
)

View Code

 

 

 

 

mysql in 子查询 效率慢，对比

标签：com   技术   sed   closed   where   gif   commit   ima   select