mysql 中LIKE 與FIND_IN_SET 與關聯表left join 速度效率比較

有一張表Table有IDStr字段，如下只顯示二個字段還有很多其他字段

方式一 字段逗號分割，直接用UserIDStr字段，里面存多個ID用逗號分割

UUID　　UserIDStr

1111　　1,2,3

2222　　3

方式二用關聯表，關聯表如下：

UUID　　UserID

1111　　 1

1111　　 2

1111　　 3

222　　　3

 

測試了50W條數量

-- 方式一設計用 Like查幾次時間分別是： 1.192s 1.140s 1.171s 1.425s
select * from af_archive where concat(',',EditUserIDArr,',') like CONCAT('%,','6',',%') and CreateUserID=10 order by CreateTime desc limit 11,20;

-- 方式一設計用 FIND_IN_SET查了幾次時間分別是： 1.441s 1.336s 1.214s 1.116s
select * from af_archive where FIND_IN_SET('6',EditUserIDArr) and CreateUserID=10 order by CreateTime desc limit 11,20;

--方式二設計用 left join on 查了幾次時間分別是 1.134s 1.037s 1.068s 1.120s 1.112s 1.472 1.422 1.160s 1.047
select a.* from af_archive a left join archiveedituser b on a.ArchiveUUID=b.ArchiveUUID and b.EditUserID=6 where a.CreateUserID=10 order by a.CreateTime desc limit 11,20;

分析結果

方式一(字段逗號分割)的LIKE與FIND_IN_SET時間差不多，不分上下

方式二(關聯表)的用LEFT JOIN ON 時間比上面這種方式要快一些。

另外方式二有二種 不推薦的寫法查詢時間較久，如下

--方式二先 left join on再 where條件 用時 5.641s 5.488s 7.679s 6.230
select a.* from af_archive a left join archiveedituser b on a.ArchiveUUID=b.ArchiveUUID where b.EditUserID=6 and a.CreateUserID=10 order by a.CreateTime desc limit 11,20;

-- 方式二用where in 用時： 6.397s 5.842s 5.621s
select a.* from af_archive a where 6 in (select b.EditUserID from archiveedituser b where a.ArchiveUUID=b.ArchiveUUID) and a.CreateUserID=10 order by a.CreateTime desc limit 11,20;

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后面把數據添加到150W條數據測試結果如下

-- Like 7.256s 6.072s 8.108s 6.013s 6.060s
-- select * from jsj_af.af_archive where concat(',',EditUserIDArr,',') like CONCAT('%,','6',',%') and CreateUserID=10 order by CreateTime desc limit 11,20;

-- FIND_IN_SET 5.624s 5.574s 5.608s 7.465s 5.931s
-- select * from jsj_af.af_archive where FIND_IN_SET('6',EditUserIDArr) and CreateUserID=10 order by CreateTime desc limit 11,20;

-- left join on 5.872s 7.254s 7.317s 5.671s 6.305s
-- select a.* from jsj_af.af_archive a left join jsj_af.archiveedituser b on a.ArchiveUUID=b.ArchiveUUID and b.EditUserID=6 where a.CreateUserID=10 order by a.CreateTime desc limit 11,20;