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From: Robert Klemme <shortcutter@googlemail.com>
Newsgroups: comp.databases.postgresql
Subject: Re: issue with UPDATE
Date: Sat, 6 Oct 2018 13:17:41 +0200
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On 05.10.2018 18:44, lboc80@gmail.com wrote:
> I'm stuck with an UPDATE, probably I'm messing something up:
> 
> 
> the amount of rows in the '`proj_los`' table expected to be updated are 32, but only 8 get updated,

No, 174202 get updated.

> unless I add an AND condition.
> 
>      select count(*) from import.tmp_kk where root_id = '57b2e67b-5862-499a-a471-0f2f6b23440e';
>      > 32
>      
>      
>    
>    
> 1) correct result -> using last AND clause (`root_id = '57b2e67b-5862-499a-a471-0f2f6b23440e'`)
> 
>      
>      sql> update
>             proj_los as oko
>             set lo_root_id = import.tmp_kk.root_id
>             from import.tmp_kk
>             where oko.lo_id = import.tmp_kk.lo_id
>             and import.tmp_kk.root_id = '57b2e67b-5862-499a-a471-0f2f6b23440e'
>      [2018-10-05 18:13:59] 32 rows affected in 50 ms
>      
>      
>      select count(*) from proj_los where lo_root_id = '57b2e67b-5862-499a-a471-0f2f6b23440e';
>      
>      > 32
>      
>      
>      
>      
> 2) wrong result
>      
>      sql> update
>               proj_los as oko
>             set lo_root_id = import.tmp_kk.root_id
>             from import.tmp_kk
>             where oko.lo_id = import.tmp_kk.lo_id;
>      [2018-10-05 18:17:31] 174202 rows affected in 17 s 427 ms
>      
>      select count(*) from proj_los where lo_root_id = '57b2e67b-5862-499a-a471-0f2f6b23440e';
>      
>      > 8
> 
> Any help on this?
> 


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