-- hadoop開(kāi)頭的是UCenter表，cdb開(kāi)頭的是BBS部分的表
? -- 搜索出所有垃圾用戶名: select `hadoop_members`.`username` from `hadoop_members` left join `cdb_members` on `hadoop_members`.`username`=`cdb_members`.`username` where `cdb_members`.`username` is null; select `hadoop_members`.`username` from `hadoop_members` where not exists (select `cdb_members`.`username` from `cdb_members` where `hadoop_members`.`username`=`cdb_members`.`username`);
? -- 搜索出垃圾用戶個(gè)數(shù): select count(`hadoop_members`.`username`) from `hadoop_members` left join `cdb_members` on `hadoop_members`.`username`=`cdb_members`.`username` where `cdb_members`.`username` is null; select count(`hadoop_members`.`username`) from `hadoop_members` where not exists (select `cdb_members`.`username` from `cdb_members` where `hadoop_members`.`username`=`cdb_members`.`username`);
? -- 刪除垃圾用戶 delete from `hadoop_members` where not exists (select 1 from `cdb_members` where `hadoop_members`.`username`=`cdb_members`.`username`);

?

? ? 本文轉(zhuǎn)自eyjian 51CTO博客，原文鏈接：http://blog.51cto.com/mooon/909768，如需轉(zhuǎn)載請(qǐng)自行聯(lián)系原作者

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