Can I concatenate multiple MySQL rows Group into one field?

Question

Using MySQL, I can do something like:

SELECT sum(capacity) FROM table_name GROUP BY HOUR(time) ;

My Output:

1240
987
1092
1205

but instead I just want 1 row, 1 col:

Expected Output:

1240, 987, 1092, 1205

Answer 1

You could use group concat on your result

  SELECT group_concat(my_sum)
  from  (
    select  sum(capacity) my_sum
    FROM table_name 
    GROUP BY HOUR(time) 
    ORDER BY Hour(time)
  ) t