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From: Jasen Betts <jasen@xnet.co.nz>
To: pgsql-sql@postgresql.org
Subject: Re: DELETE WHERE EXISTS unexpected results
Date: 2 Dec 2010 07:47:09 GMT
Message-ID: <id7itt$69m$3@reversiblemaps.ath.cx> (raw)
References: <OF34A9AF8F.539E0789-ON852577EB.0077F498-852577EB.007A650B@us.ibm.com>

On 2010-11-30, Jeff Bland <bland@us.ibm.com> wrote:
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> I want to delete certain rows from table USER_TBL. 
> Two tables are involved.  USER_TBL and OWNER_TBL. 

delete ... using  was invented for this purpose.

> In the end I expect the USER_TBL to  not contain the 3  HOME  entries. 
> But what is happening is the whole USER_TBL is empty after the query. 

your subselect is being effected by the table used in the delete.

-- 
⚂⚃ 100% natural



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