Delete - I can't specify target table?

2019-01-17 10:47发布

Why this query doesn't work?

DELETE FROM recent_edits 
WHERE trackid NOT IN 
     (SELECT DISTINCT history.trackid 
     FROM history JOIN recent_edits ON history.trackid=recent_edits.trackid 
     GROUP BY recent_edits.trackid)

I get this message : "You can't specify target table "recent_edits" for update in FROM clause

2条回答
一纸荒年 Trace。
2楼-- · 2019-01-17 11:23

Try in this way

DELETE FROM recent_edits 
WHERE trackid NOT IN 
     (select * from (SELECT DISTINCT history.trackid 
     FROM history JOIN recent_edits ON history.trackid=recent_edits.trackid 
     GROUP BY recent_edits.trackid) as t);
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Anthone
3楼-- · 2019-01-17 11:35

You can't post-process a table which is locked for deletion. using the hack select * from (query) as Nicola states will generate a temporary table instead of direct access.

Edit - make sure that you give ID to the tables you use since it is nested and will require uniqueID for every table.

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