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query index not used
Posted by: Adrian Petre
Date: August 15, 2013 05:23AM

Hi, I have the following simple self-explained query:

SELECT items.*
FROM gallery.items
WHERE left_ptr <= 7776

Mysql EXPLAIN output:

id select_type table type possible_keys key key_len ref rows Extra
1 SIMPLE items ALL PRIMARY,left_ptr,right_ptr NULL NULL NULL 4858 Using where

I have an index on left_ptr; why is not used ?

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