Mark Dale wrote:
Hello MySQL List
I have a simple table that outputs results like so:
select name, question_id, answer from table;
+-------+--------------+---------+
|NAME |QUESTION_ID |ANSWER |
+-------+--------------+---------+
|Mark |100 |Yes |
|Mark |101 |No |
|Leigh |100 |Yes |
|Leigh |101 |No |
+-------+--------------+---------+
Is there a way to query things so the result looks like this:
select ???
+--------+-----------+-----------+
|NAME |100 |101 |
+--------+-----------+-----------+
|Mark |Yes |No |
|Leigh |No |Yes |
+--------+-----------+-----------+
No, but you can get it to look like this:
mysql> select n.name, n.question_id, n2.answer from blah n, blah n2
where n.name=n2.name and n.answer=n2.answer;
+-------+-------------+--------+
| name | question_id | answer |
+-------+-------------+--------+
| chris | 1 | yes |
| chris | 2 | no |
+-------+-------------+--------+
2 rows in set (0.00 sec)
You need to do a self-join on all but one column so you can get the
"rows" to become "columns".
Make sure you have indexes on all joining columns otherwise it will be slow.
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