GROUP BY

GROUP BY

The GROUP BY clause summarizes data. #GROUP BY CLAUSE SELECT NAME, COL#, COUNT(*) AS Number_of_times FROM col$ WHERE COL# = 1 GROUP BY NAME, COL#; Every object that is not in the aggreagate function such as COUNT() must be in the GROUP BY.

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GROUP BY

The WHERE clause is not needed with GROUP BY clauses. The columns being selected must be included in the GROUP BY CLAUSE SELECT NAME FROM col$ WHERE COL# = 1 GROUP BY NAME; so if I wanted to include two columns: name, age. I would have have to include them in the GROUP BY clause.

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