Скачать или смотреть Tutorial 6- Indexing In MySQL-MySQL Complete Playlist

CREATE INDEX statement in SQL is used to create indexes in tables.
The indexes are used to retrieve data from the database more quickly than others.
The user can not see the indexes, and they are just used to speed up queries /searches.
Note: Updating the table with indexes takes a lot of time than updating a table without indexes.
It is because the indexes also need an update.
So, only create indexes on those columns that will be frequently searched against.
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