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From Robert Enyedi <robert.eny...@intland.com>
Subject How to emulate multiple DISTINCT aggregates?
Date Mon, 28 Aug 2006 15:58:15 GMT

When trying to use multiple DISTINCT aggregates in Derby:

/SELECT COUNT(distinct editable), COUNT( distinct visible )
FROM item/

the following error is reported:

/ERROR 42Z02: Multiple DISTINCT aggregates are not supported at this time./

For a simple query one could write:

/SELECT COUNT(distinct editable) AS editable_count, COUNT( (SELECT 
DISTINCT visible FROM item) )
FROM item/

but this is actually pretty uncomfortable and unmaintainable in a larger 

Does anyone know an elegant overcome for this Derby limitation?


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