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Displaying posts with tag: mysql index (reset)

Explain this
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The EXPLAIN command is an important tool to review how a SQL query is executed and in this example includes what indexes are used.

By adding a covering index I ended up with the following EXPLAIN plan I was unable to explain. The end result was a boost in server performance which was the ultimate goal.

mysql> explain select max(md)  from e_r  where email = '' and id = '36981';
| id | select_type | table | type …
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