2. Which PostgreSQL clause is used to perform grouping operations beyond what is specified in the GROUP BY clause? UNION INTERSECT HAVING Grouping sets 8. Which are all possible grouping sets generated by the following statement: SELECT c1, c2, c3, aggregate(c4) FROM table_name GROUP BY ROLLUP (c1, c2, c3)? (c1, c2, c3); (c1, c2); (c2, c3); (c1,c3); (c1); (c2); (c3); () (c1, c2, c3); (c1, c2); (c1,c3); (c1); (c2); (c3); () (c1, c2, c3); (c2, c3); (c1,c3); (c1); (c2); () (c1, c2, c3); (c1, c2); (c1); (c2); () (c1, c2, c3); (c1, c2); (c1); ()
Question
- Which PostgreSQL clause is used to perform grouping operations beyond what is specified in the GROUP BY clause?
UNION INTERSECT HAVING Grouping sets
- Which are all possible grouping sets generated by the following statement: SELECT c1, c2, c3, aggregate(c4) FROM table_name GROUP BY ROLLUP (c1, c2, c3)?
(c1, c2, c3); (c1, c2); (c2, c3); (c1,c3); (c1); (c2); (c3); () (c1, c2, c3); (c1, c2); (c1,c3); (c1); (c2); (c3); () (c1, c2, c3); (c2, c3); (c1,c3); (c1); (c2); () (c1, c2, c3); (c1, c2); (c1); (c2); () (c1, c2, c3); (c1, c2); (c1); ()
Solution
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The PostgreSQL clause used to perform grouping operations beyond what is specified in the GROUP BY clause is HAVING.
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The possible grouping sets generated by the given statement are (c1, c2, c3); (c1, c2); (c1); ().
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