PostgreSQL does not know how to sort 'TEST'.
You must help it be telling it what tpe it is.
Add ::text after 'TEST' as in 'TEST'::text.
Maybe PostgreSQL should default to text for unknown types...
JLL
Andreas Schlegel wrote:
>
> Hi,
>
> I need some help to let this sql statement run with Postgres 7.2.1
>
> Doesn't work:
> select DISTINCT tnr, titel, 'TEST' AS testcol from tTitel;
> ERROR: Unable to identify an ordering operator '<' for type 'unknown'
> Use an explicit ordering operator or modify the query
>
> If I remove the DISTINCT keyword it works:
> select tnr, titel, 'TEST' AS testcol from tTitel;
>
> Greetings,
> Andreas
>
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