INNER or LEFT Joining Multiple Table Records Into A Single Row

Question

Phone Table

+----------------+-------------+
| Field          | Type        |
+----------------+-------------+
| f_id           | int(15)     |
|         


        

Answer 1

SELECT CONCAT(c.f_first_name, ' ', c.f_last_name) as Client_Name, 
       wp.f_phone_number as Work_Number,
       hp.f_phone_number as Home_Number

  FROM clients c
       LEFT OUTER JOIN phone hp
       ON hp.f_client_id = c.f_id
    AND
       hp.phone_type = 'home'
       LEFT OUTER JOIN phone wp
       ON wp.f_client_id = c.f_id
    AND
       wp.phone_type = 'work'

With LEFT OUTER JOINs you will still get rows for clients with missing numbers. If you don't want to see those, change to INNER JOINs.

Edit: As Nick kindly reminds me, this will return multiple rows for clients with multiple phone numbers. Once you have the data you need, you're then faced with presentation issue. You can handle that in the application layer, or make a sacrifice to the SQL gods and look into MySQL's GROUP_CONCAT() function.