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Re: case when... end in update clause?

From: Emi Lu <emilu(at)encs(dot)concordia(dot)ca>
To: Aaron Bono <aaron(dot)bono(at)aranya(dot)com>
Cc: pgsql-sql(at)postgresql(dot)org
Subject: Re: case when... end in update clause?
Date: 2008-03-12 16:01:21
Message-ID: 47D7FE51.60004@encs.concordia.ca (view raw or flat)
Thread:
Lists: pgsql-sql
Aaron Bono wrote:
> On Wed, Mar 12, 2008 at 10:47 AM, Emi Lu <emilu(at)encs(dot)concordia(dot)ca> wrote:
> 
>> Hello,
>>
>> May I know can "case when " used by update clause. If yes, how?
>>
>> I use one small Example, table: test
>> =============================
>> id
>> ==
>> 5
>> 6
>> 8
>>
>> try to update test.id
>>
>>
>> update test
>>
>> case
>>  when id =5 then SET id = 6
>> end
>> ;
>>
>> <http://www.postgresql.org/mailpref/pgsql-sql>
>>
> 
> Is this what you are looking for:
> 
> 
> update test
> set id = case when id = 5 then 6 else id end;
> 
Exactly what I am looking for!

Thanks a lot!

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