On Dec 26, 2006, at 18:39 , Mike Benoit wrote:
Fails
---------------------
select * from income_tax_rate_us UNION select * from
income_tax_rate_us
order by state is null;
ERROR: ORDER BY on a UNION/INTERSECT/EXCEPT result must be on one of
the result columns
Even though state is a column in both tables, the order by is using
an expression, rather than a column.
Should work:
SELECT *, state IS NULL AS state_is_null
FROM income_tax_rate_us
UNION
SELECT *, state IS NULL AS state_is_null
FROM income_tax_rate_us
ORDER BY state_is_null
This should also work:
SELECT *
FROM (
SELECT *
FROM income_tax_rate_us
UNION
SELECT *
FROM income_tax_rate_us
) union_result
ORDER BY state IS NULL
I'm not sure of the underlying reasons why your query doesn't work,
but give these a shot.
Michael Glaesemann
grzm seespotcode net
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