Question

Is it possible to group_concat records by distinct Ids:

GROUP_CONCAT(Column2 BY DISTINCT Column1)

I need to get the values from column2 by distinct values from column1. Because there are repeating values in column 2, that’s why I can’t use distinct on column2.

Any thoughts on this? Thanks!

EDIT 1

Sample Table Records:

ID  Value
1   A
1   A
2   B
3   B
4   C
4   C

Using the GROUP_CONCAT the I wanted [GROUP_CONCAT(Value BY DISTINCT Id)], I will have an output:

A, B, B, C

EDIT 2

Somehow got my group_concat working:

GROUP_CONCAT(DISTINCT CONCAT(Id, '|', Value))

This will display the concatenated values by distinct id, just need to get rid of the Id somewhere. You can do it without the concat function, but I need the separator. This may not be a good answer but I’ll post it anyway.

Answer 1

Try this one, (the simpliest way)

SELECT GROUP_CONCAT(VALUE)
FROM
(
    SELECT DISTINCT ID, VALUE
    FROM TableName
) a

SQLFiddle Demo