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Editorial Team
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Asked: 2026-05-21T06:58:55+00:00

Why does this work SELECT DISTINCT FIRSTNAME, LASTNAME FROM books, CUSTOMERS, orders, orderitems WHERE

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Why does this work

SELECT DISTINCT FIRSTNAME, LASTNAME
FROM books, CUSTOMERS, orders, orderitems
WHERE STATE IN('FL ', 'GA')
GROUP BY orders.order#, firstname, lastname
HAVING SUM(retail*quantity) > 80

but when firstname, lastname is removed from group by it doesn’t?

ORA-00979: not a GROUP BY expression

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1 Answer

  1. Editorial Team

    In that case where firstname, lastname are removed from the group by, you get that error because you’re SELECTing a column(s) that aren’t in the GROUP BY expression, or aren’t part of an aggregation/function (i.e. MIN, MAX, AVG, and others).

    You could also eliminate the DISTINCT as well.

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