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  • Users: trungson
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  1. trungson

    Unique Col & Efficiency

    Hi, Say I have a column that is unique (but not required). Is it good to keep it or it'd slow down when *inserting* new records (checking for uniqueness)? But also, keeping the unique constraint, does it help with *selecting* a row using that column as the condition? Eg: SELECT * FROM table...

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