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
Ask.Use-The-Index-Luke.com

0
votes
0
answers
665
views

Index for PostgreSQL ORDER BY

Apr 21 at 09:39 Lamplighter 1
postgresql
-1
votes
0
answers
2.1k
views

ORACLE 12C Unstructured Data Management (text mining)

Mar 11 at 09:19 Helraezer 0
oracle unstructured 12c data
1
vote
2
answers
6.0k
views

"Order by RAND()" - can use Index?

Feb 23 at 12:06 Markus Winand ♦♦ 936
random index mysql order-by-rand