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I have a simple mysql table with five columns:
id: auto_increment (primary)
id_symbol: INT(4)
id_category: INT(4)
id_sector: INT(4)
name: VARCHAR(100)
I would like to create an index for id_simbol, id_category, id_sector so ONE index for those columns. My question is:
DO i also have to add the id (auto_increment) do this index so four columns in total?
Thank you!
No, you don’t have to add
idcolumn to that index.