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Chaz
Chaz

Reputation: 817

MySQL Query with multiple GROUP BY - How do I make one group a column head and one group a row head in an HTML table?

That title may not make sense, I'm not sure how to ask what I'm trying to do in a single sentence...

I have a MySQL table like this:

| id | user  | team   | month | result |
|----|-------|--------|-------|--------|
| 1  | Joe   | red    | sept  | 100    |
| 2  | Joe   | red    | oct   | 40     |
| 3  | Jim   | red    | sept  | 70     |
| 4  | Jim   | red    | oct   | 50     |
| 5  | Susy  | red    | sept  | 40     |
| 6  | Tim   | blue   | sept  | 60     |
| 7  | Tim   | blue   | oct   | 100    |
| 8  | Betty | blue   | sept  | 70     |
| 9  | Dave  | blue   | sept  | 20     |
| 10 | Stan  | green  | oct   | 40     |
| 11 | Alan  | green  | sept  | 80     |
| 12 | Tina  | green  | oct   | 100    |
| 13 | Tina  | green  | sept  | 30     |
| 14 | Rick  | yellow | oct   | 50     |
| 15 | Ellen | yellow | oct   | 60     |

Ultimately I'm trying to output an HTML table that shows a total number of users who have a result greater than 50 organized by team and month.

Here's the query I'm running right now:

SELECT team, month, count(*)
FROM example
WHERE result >= 50
GROUP BY team, month

Which returns this:

| team   | month | count(*) |
|--------|-------|----------|
| blue   | oct   | 1        |
| blue   | sept  | 2        |
| green  | oct   | 1        |
| green  | sept  | 1        |
| red    | oct   | 1        |
| red    | sept  | 2        |
| yellow | oct   | 2        |

But in my HTML table I want to list out months as columns (and add a total column). So an HTML table that renders like this (ignore the sorting, it's arbitrary):

| Team   | sept | oct | Total |
|--------|------|-----|-------|
| red    | 2    | 1   | 3     |
| blue   | 2    | 1   | 3     |
| green  | 1    | 1   | 2     |
| yellow | 0    | 2   | 2     |

Can I work with the query result I have and somehow manipulate it into the end format in the PHP/HTML? Or do I need to change the way I'm querying in the first place?

*Editing to change the HTML table output example - I want this to be dynamic so that as more months are added to original table the resulting HTML table can expand horizontally.

Upvotes: 1

Views: 2116

Answers (1)

GarethD
GarethD

Reputation: 69789

The basic SQL you need is:

SELECT  Team,
        COUNT(CASE WHEN Month = 'Sept' THEN 1 END) AS Sept,
        COUNT(CASE WHEN Month = 'Oct' THEN 1 END) AS oct,
        COUNT(*) AS Total
FROM    T
GROUP BY Team;

Example on SQL Fiddle

If you don't know the number of columns you need you will need to do it dynamically with a prepared statement'

SET @sql = NULL;
SELECT  GROUP_CONCAT(DISTINCT
            CONCAT(
                'COUNT(CASE WHEN Month = ''',
                Month,
                ''' THEN 1 END) AS ',
                Month
                )
            ) 
INTO    @sql
FROM    T;

SET @sql = CONCAT('SELECT Team, ', @sql, ', COUNT(*) AS Total FROM T GROUP BY Team');

PREPARE stmt FROM @sql;
EXECUTE stmt;
DEALLOCATE PREPARE stmt;

Example on SQL Fiddle

Upvotes: 2

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