Re: Setting a default value for a select statement without results - Mailing list pgsql-sql

On 2013-02-06, JORGE MALDONADO <jorgemal1960@gmail.com> wrote:
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>
> I have an UPDATE query with the following general structure:
>
> UPDATE table1 SET (SELECT field FROM table2 WHERE conditions ORDER BY
> order_field LIMIT 1)

assuming you mean this, and you are happy with its performance.

 UPDATE table1 SET field1 = (SELECT field FROM table2 WHERE conditions ORDER BY

 order_field LIMIT 1)


> Is it possible to assign a default value in case no results are returned by
> the SELECT statement?

use coalesce.

 UPDATE table1 SET field1 = coalesce( (SELECT field FROM table2 WHERE conditions ORDER BY
 order_field LIMIT 1) , default_value )




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