MySQL Group by one column, but select all data

Question

I\'ve got a database which contains lots of data. I would like to select all data, but Group by one column.

So for example:

column a | column b
examp         


        

Answer 1

I think you can get what you want using group_concat():

select a, group_concat(b)
from t
group by a;

This will create a list of "b"s for each a. In your example:

example    apple,pear,orange,strawberry

You can change the separator using the SEPARATOR keyword.

EDIT:

You can use group_concat() multiple times:

select a, group_concat(b) as bs, group_concat(c) as cs
from t
group by a;

Or, combine it with concat():

select a, group_concat(concat(b, ':', 'c')) as bcs
from t
group by a;