January 2019
Intermediate to advanced
286 pages
7h 41m
English
Content preview from Advanced MySQL 8
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The five general rules for your indexes
The five general rules to know when it is appropriate to create an index would be to respond positively to the following questions:
- Can you Index each primary key?
- Can you Index each foreign or secondary key?
- Can you Index each column used in a JOIN clause?
- Can you Index each column used in a WHERE?
- Can you Index each column used in a GROUP BY clause?
- Can you Index each column used in an ORDER BY clause?
- Are you going to generate reports?
In other words, indexes become necessary when you plan to use joins, that is, WHERE, GROUP BY, and ORDER BY.
If your table is very small, for example, only a few employees, it is more difficult to use an index than to let MySQL do a full scan of the table. Indexes ...
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