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

From: Emi Lu <emilu(at)encs(dot)concordia(dot)ca>
To: Scott Marlowe <scott(dot)marlowe(at)gmail(dot)com>
Cc: pgsql-sql(at)postgresql(dot)org
Subject: Re: case when... end in update clause?
Date: 2008-03-12 16:11:09
Message-ID: 47D8009D.6000703@encs.concordia.ca
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>>
>> 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
>> ;
>
> would this work:
>
> update test set id=5 where id=6;
>

No. I provide one small fake example.

I want to know how to use case when in update/set clause as the following:

update test
set id = case when id = 5 then 6 else id end;

Thanks.

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