Duplicate entry for key 'group_key'

Question

I\'m running a query in MySQL where I\'m grouping by four columns and selecting a lot of things, including the four values I\'m grouping by. But I get this error when I run

Answer 1

This is usually disk space issue. Specially temporary space (in linux /tmp). Check you database server Disk space.

Answer 2

Your issue seems like a MySQL bug. I was reviewing the logs for our production server the other day and the error logs were filled with this error. I used the workaround below and the errors are gone.

SET SESSION max_heap_table_size=536870912;

SET SESSION tmp_table_size=536870912;

Source: http://bugs.mysql.com/bug.php?id=58081

Answer 3

You should put the aliases in the group buy like this:

Create table table2 as
Select round(x, 0) as x, round(a, 0) as a, round(b, 0) as b, c, d, e, f
from table1
group by x, a, b, c;