This week's book giveaways are in the Refactoring and Agile forums.
We're giving away four copies each of Re-engineering Legacy Software and Docker in Action and have the authors on-line!
See this thread and this one for details.
Win a copy of Re-engineering Legacy Software this week in the Refactoring forum
or Docker in Action in the Cloud/Virtualization forum!
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joins and rollup

rama rajesh
Posts: 28
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How to identify which is a subquery and which is correlate subquery?i understand the difference between correlated subquery and subquery
(got information like subqeury executed only one and correlated subquery executes several times)

i read the rollup function, but i can't understand the functionality.
if anybody knows, please explain with simple example(rollup by more than 2 columns)
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