The Question :
225 people think this question is useful
Is it possible to
GROUP BY more than one column in a MySQL
SELECT query? For example:
GROUP BY fV.tier_id AND 'f.form_template_id'
The Question Comments :
The Answer 1
303 people think this answer is useful
GROUP BY col1, col2, col3
The Answer 2
128 people think this answer is useful
Yes, you can group by multiple columns. For example,
SELECT * FROM table
GROUP BY col1, col2
The results will first be grouped by col1, then by col2. In MySQL, column preference goes from left to right.
The Answer 3
23 people think this answer is useful
Yes, but what does grouping by more two columns mean? Well, it’s the same as grouping by each unique pair per row. The order you list the columns changes the way the rows are sorted.
In your example, you would write
GROUP BY fV.tier_id, f.form_template_id
Meanwhile, the code
GROUP BY f.form_template_id, fV.tier_id
would give similar results, but sorted differently.
The Answer 4
17 people think this answer is useful
group by fV.tier_id, f.form_template_id
The Answer 5
14 people think this answer is useful
To use a simple example, I had a counter that needed to summarise unique IP addresses per visited page on a site. Which is basically grouping by pagename and then by IP. I solved it with a combination of DISTINCT and GROUP BY.
SELECT pagename, COUNT(DISTINCT ipaddress) AS visit_count FROM log_visitors GROUP BY pagename ORDER BY visit_count DESC;
The Answer 6
5 people think this answer is useful
If you prefer (I need to apply this) group by two columns at same time, I just saw this point:
SELECT CONCAT (col1, '_', col2) AS Group1 ... GROUP BY Group1
The Answer 7
-3 people think this answer is useful
GROUP BY CONCAT(col1, '_', col2)