Re: nested query

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От Oliver Elphick
Тема Re: nested query
Дата
Msg-id 200101051501.f05F1ZH32112@linda.lfix.co.uk
обсуждение исходный текст
Ответ на nested query  (Mustapha Amrani <ma10024@newton.cam.ac.uk>)
Список pgsql-docs
Mustapha Amrani wrote:
  >I have two linked tables Table1 and Table2. I have deleted some rows in tabl
      >e1
  >Now I need two delete the rows in table2 that correspond to the rows
  >deleted in table1. The two table are linked by field id.
  >I tried the following but with no success:
  >delete * from table2 where not exists (select * from table1 where
  >table2.id=id);

How about:

DELETE FROM table2 WHERE id NOT IN (select id FROM table1);

--
Oliver Elphick                                Oliver.Elphick@lfix.co.uk
Isle of Wight                              http://www.lfix.co.uk/oliver
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