El Jue 15 Abr 2004 07:25, Dan Field escribió:
> I've stumbled across a query I don't quite understand the error message
> for.
>
> This query is pulled from a working MySQL setup:
>
> SELECT
> DEWEY_ID, DEWEY_HUNDREDS, DEWEY_TENS, DEWEY_ONES, DEWEY_POINT_ONES,
> DEWEY_POINT_TENS,
> DEWEY_POINT_HUNDREDS, DEWEY_POINT_THOUSANDS, DEWEY_TYPE, DEWEY_LANG,
> DEWEY_SUBJECT FROM lu_dewey
> WHERE
> (DEWEY_HUNDREDS = 9) AND
> (DEWEY_TENS >= 0) AND
> (DEWEY_TENS <= 9) AND
> (DEWEY_ONES = 0 || DEWEY_ONES = NULL) AND
> (DEWEY_POINT_ONES = 0 || DEWEY_POINT_ONES = NULL) AND
> (DEWEY_POINT_TENS = 0 || DEWEY_POINT_TENS = NULL) AND
> (DEWEY_POINT_HUNDREDS = 0 || DEWEY_POINT_HUNDREDS = NULL) AND
> (DEWEY_POINT_THOUSANDS = 0 || DEWEY_POINT_THOUSANDS = NULL) AND
> (DEWEY_TYPE = 't') AND
> (DEWEY_LANG = 'en')
> ORDER BY DEWEY_TENS
>
>
> However I'm getting the following error:
>
> ERROR: Unable to identify an operator '=' for types 'character' and
> 'boolean' You will have to retype this query using an explicit cast.
1) Change the "= NULL" to "IS NULL" which is how it's defined in the SQL
standards.
2) What data type does DEWEY_TYPE have?
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Martín Marqués | select 'mmarques' || '@' || 'unl.edu.ar'
Centro de Telematica | DBA, Programador, Administrador
Universidad Nacional
del Litoral
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