Obfuscated Conditions


The following sections demonstrate some popular methods for obfuscating conditions. Obfuscated conditions are where clauses that are phrased in a way that prevents proper index usage. This section is a collection of anti-patterns every developer should know about and avoid.

About the Author

Photo of Markus Winand
Markus Winand tunes developers for high SQL performance. He also published the book SQL Performance Explained and offers in-house training as well as remote coaching at http://winand.at/

?Recent questions at
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Join with inequalities only

Dec 16 at 12:06 Markus Winand ♦♦ 936
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PostgreSQL Bitmap Heap Scan on index is very slow but Index Only Scan is fast

Oct 31 at 11:31 Markus Winand ♦♦ 936
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