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Why doesn MAX(Primary key field) use index?

April 26, 2017field index key Max primary

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Why doesn MAX(Primary key field) use index?

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It’s because primary keys are enforced using ascending index and MAX only uses descending index. For example, if you try to get MIN(PK) it would use the index. If you often have queries using MAX, it is a good idea to create another, DESCENDING index on PK column.