MySQL SELECT and GROUPING - mysql

Question

I am new to SQL (mySQL) and I am trying to create a query that will populate a google chart specifically
The result should look something like this:
['group_name', 'Open_tickets_count', 'closed_tickets_count'],
['Team A', 10, 400],
['Team B', 30, 460],
['Team C', 66, 1120],
['Team D', 5, 540]
I have a tickets table that includes the following fields: id ticket_status group_name.
A few things:
In this example I only have two statuses, but the number of
statuses is actually variable
The number of teams is also variable
the actual group_names and tickets_statuses are ids to other
tables in my real table. (but I can figure out how to substitute)
I have tried everything my imagination and limited knowledge allows and got not even near to achieve this. Any help or pointers would be highly appreciated.
Thank you.
[Adding sample table structures (only relevant fields)]
Table: tickets
'id', 'int(10)'
'ticket_status_id', 'int(10)'
'ticket_group_id', 'int(10)'
Table: status
'id', 'int(10)'
'name', 'varchar(250)'
Table: groups
'id', 'int(10)'
'name', 'varchar(250)'

Answer 1

In order to achieve your goal you need to use conditional SUM() with GROUP BY and dynamic SQL (PREPARE, EXECUTE).
Your base script might look like this
SET #sql = '';
SELECT
GROUP_CONCAT(DISTINCT
CONCAT(
'SUM(CASE WHEN t.ticket_status = ''',
id,
''' THEN 1 ELSE 0 END) `',
name, '`'
)
) INTO #sql
FROM
status;
SET #sql = CONCAT
('SELECT g.name, ', #sql, '
FROM tickets t JOIN status s
ON t.ticket_status = s.id JOIN groups g
ON t.ticket_group_id = g.id
GROUP BY t.ticket_group_id, g.name'
);
PREPARE stmt FROM #sql;
EXECUTE stmt;
DEALLOCATE PREPARE stmt;
Here is SQLFiddle demo.

Answer 2

Lets go with your assumptions.
You can try something like
SELECT group_name,
SUM(CASE WHEN ts.status = 'OPEN' THEN 1 ELSE 0 END) Open_tickets_count
SUM(CASE WHEN ts.status = 'CLOSED' THEN 1 ELSE 0 END) closed_tickets_count
FROM tickets t INNER JOIN
ticket_statusses ts ON t.ticket_status = ts.id
GROUP BY group_name
You would have to add new columns for different statusses.