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Introducing grouping sets
Every advanced user of SQL should be familiar with GROUP BY and HAVING clauses. But are you also aware of CUBE, ROLLUP, and GROUPING SETS? If not, this chapter might be worth reading for you.
Every advanced user of SQL should be familiar with GROUP BY and HAVING clauses. But are you also aware of CUBE, ROLLUP, and GROUPING SETS? If not, this chapter might be worth reading for you.