AVG-Function

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SQL Aggregate Functions

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Given a Persons table with id, name and age columns, which query should be used ...

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Assuming some column EX_COL contains following data in it - 100, 200, 300, NULL,...

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Given the Persons table: +-----+--------------+-------+ | Id | Fir...

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Given Clients table +------+--------------+----------+ | ID | Name...

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Given PAYMENT table ( ID INTEGER NOT NULL, PAY ...