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In a SQL database. Are the primary keys indexed? If

yes why do I need to index other columns?

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If the primary key is defined why you want to index a primary key? Index other columns but not Primary Key

704682000-4164616D73 Автор вопроса
Chandala Masimpe
If the primary key is defined why you want to inde...

I'm asking if primary keys are not automatically indexed

704682000 4164616D73
I'm asking if primary keys are not automatically i...

As a long as Primary key has been defined by you or automatically then its not necessary to index it.

Normally yes (I didn't check every dbms), so if you lookup by PK is fast. If you need to access the data by other patterns (ex filtering by "status" and "event_type" and "event_date" in an hypotetical event table) it's a good practice to index also these data, according to your specific patterns

704682000-4164616D73 Автор вопроса

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