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I have no idea what this even means.

Try asking on http://dba.stackexchange.com if this is a database administration question, or on http://stackoverflow.com if it is a programming question.

Thanks. I am looking it up at various places. Rollup is a db command

> rollup is a db command

You need to read "How to ask questions the smart way".

A quick google suggests "rollup" is used with grouped-queries, so it is a modifier to an SQL select operation, not a db-command as such.

Thanks for correcting