can use more than 1 column in MySQL Group BY?

Posted by Am1rr3zA on Stack Overflow See other posts from Stack Overflow or by Am1rr3zA
Published on 2010-05-01T15:02:44Z Indexed on 2010/05/01 15:07 UTC
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query

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mysql

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group-by

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sql

Hi,

I want write these SQL Query:

CREATE VIEW `uniaverage` AS select `averagegrade`.`mjr`,`averagegrade`.`lev` , avg(`averagegrade`.`average`) AS `uniAVG` from `averagegrade` group by `averagegrade`.`lev`, `averagegrade`.`mjr`;

But MySQL Query Browser give this error:

Operand Should Contain 1 column(s)

I somewhere read can use group by on more than 1 column!!! How can I solve this error? or how can I change the Query to get the same result?

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