Is using LIMIT and OFFSET in MySQL less expensive than returning the full set of records?

Yes, it would be more expensive, for two reasons.

The difference can be enormous. Not only is the network difference big sometimes (a few rows vs hundreds to thousands), but the number of rows the database needs to find can be large also. For example, if you ask for 10 rows, the database can stop after finding 10 rows, rather than having to check every row.

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