mysql - Error: column is invalid because it is not contained in either an aggregate function or the GROUP BY -



mysql - Error: column is invalid because it is not contained in either an aggregate function or the GROUP BY -

i have such code, works fine:

select count (cast(faculty nvarchar(max))) num pupil grouping cast(faculty nvarchar(max))

faculty text. need count number of faculty in column, tried code, give error: column 'student.faculty' invalid in select list because not contained in either aggregate function or grouping clause.

select faculty, count (cast(faculty nvarchar(max))) num pupil grouping cast(faculty nvarchar(max))

i cant understand, problem, because same method works fine numbers. illustration one:

select id, count(id) pupil grouping id

what doing wrong?

you error because don't grouping same select. cast(faculty nvarchar(max)) not equal faculty. why not use:

select faculty, count (*) num pupil grouping faculty

mysql sql oracle tsql group-by

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