Dec 23, 2014
How to: Difference between Key, Primary Key, Unique Key and Index in MySQL
How to: Difference between Key, Primary Key, Unique Key and Index inΒ MySQL
Difference between Key, Primary Key, Unique Key and Index in MySQL
When should I use KEY, PRIMARY KEY, UNIQUE KEY and INDEX?
Answer: Difference between Key, Primary Key, Unique Key and Index in MySQL
KEY and INDEX are synonyms.
You should add an index when performance measurements and EXPLAIN shows you that the query is inefficient because of a missing index. Adding an index can improve theβ¦
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