In general, if you can let the database do the sorting/merging of the four queries it is likely to be faster (after all, that's what a database server is optimized to do!).

There may of course be situations where trying to get the database to do the right thing requires too much shoe-horning of the data to be worth it...

Michael

In reply to Re^3: Bitten by the worst case (or why it pays to know whats inside the black box) by mpeppler
in thread Bitten by the worst case (or why it pays to know whats inside the black box) by demerphq

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