troubleshooting Question

MySQL JOIN Clause

Avatar of Ray Paseur
Ray PaseurFlag for United States of America asked on
MySQL ServerSQL
3 Comments2 Solutions548 ViewsLast Modified:
Scenario:  I have two MySQL tables.  Both of them have an index on the column called "foo."  

1. I run a SELECT query and use a JOIN clause naming "foo" in the two tables.  I get a results set giving the intersection of the tables on "foo."

2. I remove the index from one or both of the tables and rerun the query in #1.

Will I get the same results set from the second (unindexed) SELECT?  Or does the presence of an index affect the results of JOIN?
ASKER CERTIFIED SOLUTION
John Easton
Director

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