Re: Question about WHERE CASE

Hi,

where requires a boolean expression, for instance
select * from stuff where true;

Hence "CASE WHEN $1=dir THEN TRUE ELSE metadir=$1 END" returns a boolean 
value everything is fine.

Regards martin



Am 05.09.2019 um 13:04 schrieb Mike Martin:
> I have come across the following construct which works in postgres
>
> WHERE CASE WHEN $1=dir THEN TRUE ELSE metadir=$1 END
>
> via 
> (https://stackoverflow.com/questions/49859153/filter-with-yes-no-and-all-in-postgres)
> |casewhen('yes'=lower($1))then(phone_number 
> isnotnull)when('no'=lower($1))then(phone_number isnull)elsetrue end |
> |I was always under the impression that a case expression could only 
> be on the right side of a where expression ie: |
> |WHERE fieldname=<cse expression> |
> |Is this a postgres extention, cant find any documentation on this |
> |thanks |
> |Mike |

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