Question

I have a query

SELECT
    cc.contact_id,
    cc.name,
    ct.name AS contact_type
FROM
    contacts AS c
    LEFT JOIN contact_companies AS cc ON c.contact_id = cc.contact_id
    LEFT JOIN contacts_to_types AS ctt ON cc.contact_id = ctt.contact_id
    LEFT JOIN contact_types AS ct ON ctt.contact_type_id = ct.contact_type_id
WHERE
     cc.name LIKE '%p%'
ORDER BY name, contact_id

which returns:

+------------+--------------------------------+--------------+
| contact_id | name                           | contact_type |
+------------+--------------------------------+--------------+
|        297 | Primary Properties Corporation | Supplier     |
|        297 | Primary Properties Corporation | Prospect     |
|        297 | Primary Properties Corporation | Customer     |
|        298 | San Miguel Corporation         | Prospect     |
|        301 | Sulpicio Lines                 | Supplier     |
+------------+--------------------------------+--------------+

when I would like it to return:

+------------+--------------------------------+------------------------------+
| contact_id | name                           | contact_type                 |
+------------+--------------------------------+------------------------------+
|        297 | Primary Properties Corporation | Supplier, Prospect, Customer |
|        298 | San Miguel Corporation         | Prospect                     |
|        301 | Sulpicio Lines                 | Supplier                     |
+------------+--------------------------------+------------------------------+

that is, I’d like it to combine the contact_type of 297.

Is this possible? Could someone please show me how? 🙂

Thanks

Answer 1

Use the GROUP_CONCAT() aggregate function

SELECT
    cc.contact_id,
    cc.name,
    GROUP_CONCAT(ct.name SEPARATOR ', ') AS contact_type
FROM
    contacts AS c
    LEFT JOIN contact_companies AS cc ON c.contact_id = cc.contact_id
    LEFT JOIN contacts_to_types AS ctt ON cc.contact_id = ctt.contact_id
    LEFT JOIN contact_types AS ct ON ctt.contact_type_id = ct.contact_type_id
WHERE
     cc.name LIKE '%p%'
GROUP BY cc.contact_id
ORDER BY name, contact_id