Does MySQL Automatically Index Primary Keys in MyISAM and InnoDB?

Indexing the Primary Key in MySQL

Question:

When defining a primary key in MySQL, does it require an explicit index creation or is it implicitly indexed? Is this behavior consistent across the MyISAM and InnoDB storage engines?

Answer:

The primary key is automatically indexed in MySQL, without the need for explicit index creation. This holds true for both MyISAM and InnoDB storage engines. Most storage engines that support indexing generally adhere to this behavior.

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