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Re: Procedure that select different number of columns
Posted by: Peter Brawley
Date: October 15, 2013 03:47PM

Looks like an entity-attribute-value (EAV) model.

EAV queries are nightmares to write, they are nightmares to debug, they are nightmares to optimise, and they perform terribly. Consider reconsidering your model.

Otherwise, you'll be writing and debugging pivit tables for a long time. See "Pivot tables" at

To parameterise such queries for sprocs, you'll have one more layer of complication: you'll need to write the queries as Prepared Statements.

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Re: Procedure that select different number of columns
October 15, 2013 03:47PM

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