Question

This is an example MYSQL result

+----+---+
|  A | B |
+----+---+
|  1 | 1 |
|  1 | 2 | 
|  2 | 3 |
|  2 | 4 |
|  3 | 5 |
+----+---+

I would like to run through every distinct in Column A and do something utilizing the values in Column B.
Let’s say A has userids and B has foods. I would like to grab all the foods that user 1 likes and then shoot an email to 1, then grab all the foods that user 2 likes and email to her, and so forth. Would appreciate any suggestions.

Answer 1

If you want comma separated values, you can use GROUP_CONCAT

SELECT A, GROUP_CONCAT(DISTINCT B) foodList
FROM   tableName
GROUP  BY A

• SQLFiddle Demo

Other Link

• GROUP BY clause