Question

I need to combine 3 phone numbers for a user into one row. The end result would look like this

contactId | phone | mobile | fax

my tables look like this with the phone numbers broken into their own rows by phoneTypeId

---

contact_phone_link
contactId | contactPhoneNumberId
3344 | 1

---

contact_phone_numbers
id | phoneTypeId | phoneNumber
123 | 1 | 555-555-5555

---

phone_types
id | phoneTypeName
1 | Phone
2 | Mobile

3 | Fax

---

Dana thanks for your help, I’m getting closer to understanding this. I see how it’s grouping and naming and then grouping again.

I’ve gone through and adjusted the syntax, but I’m still having problems where it gets to ‘phone_link.phoneTypeId’. I think it’s because ‘contact_phone_link’ doesn’t hold ‘phoneTypeId’. Also it gets hung up when the SELECT section and JOIN section had the same variable name like ‘phone’ so I added a 1.

Tell me if I’m way off.

SELECT
    `ct`.`id` AS contact_id,
    `phone1`.`lineNumber` AS phone,
    `fax1`.`lineNumber` AS fax,
    `mobile1`.`lineNumber` AS mobile

FROM `cmd`.`contacts` AS ct

LEFT JOIN `cmd`.`contact_phone_link` AS `phone_link` ON (`phone_link`.`contactId` = `ct`.`id` AND `phone_link`.`phoneTypeId` = 1)
LEFT JOIN `cmd`.`contact_phone_numbers` AS `phone1` ON (`phone`.`id` = `phone_link`.`contactPhoneNumberId`)

LEFT JOIN `cmd`.`contact_phone_link` AS `fax_link` ON (`fax_link`.`contactId` = `ct`.`id` AND `fax_link`.`phoneTypeId` = 2)
LEFT JOIN `cmd`.`contact_phone_numbers` AS `fax1` ON (`fax`.`id` = `fax_link`.`contactPhoneNumberId`)

LEFT JOIN `cmd`.`contact_phone_link` AS `mobile_link` ON (`mobile_link`.`contactId` = `ct`.`id` AND `mobile_link`.`phoneTypeId` = 3)
LEFT JOIN `cmd`.`contact_phone_numbers` AS `mobile1` ON (`mobile`.`id` = `mobile_link`.`contactPhoneNumberId`)

WHERE (`ct`.`id` = 4160);

Answer 1

Edited solution below.

SELECT
    `ct`.`id` AS contact_id,
    `phone_sub_query`.`lineNumber` AS phone,
    `fax_sub_query`.`lineNumber` AS fax,
    `mobile_sub_query`.`lineNumber` AS mobile

FROM `cmd`.`contacts` AS ct

left join
    (select `phone_link`.`contactId`, `phone_number`.`lineNumber`
    from `cmd`.`contact_phone_link` AS `phone_link`
    join `cmd`.`contact_phone_numbers` AS `phone_number` ON (`phone_number`.`id` = `phone_link`.`contactPhoneNumberId`)
    where `phone_number`.`phoneTypeId` = 1) as `phone_sub_query` on `phone_sub_query`.`contactId` = `ct`.`id`

left join
    (select `phone_link`.`contactId`, `phone_number`.`lineNumber`
    from `cmd`.`contact_phone_link` AS `phone_link`
    join `cmd`.`contact_phone_numbers` AS `phone_number` ON (`phone_number`.`id` = `phone_link`.`contactPhoneNumberId`)
    where `phone_number`.`phoneTypeId` = 2) as `fax_sub_query` on `fax_sub_query`.`contactId` = `ct`.`id`

left join
    (select `phone_link`.`contactId`, `phone_number`.`lineNumber`
    from `cmd`.`contact_phone_link` AS `phone_link`
    join `cmd`.`contact_phone_numbers` AS `phone_number` ON (`phone_number`.`id` = `phone_link`.`contactPhoneNumberId`)
    where `phone_number`.`phoneTypeId` = 3) as `mobile_sub_query` on `mobile_sub_query`.`contactId` = `ct`.`id`

WHERE (`ct`.`id` = 4160);

Given your table structure, I think using sub-queries might be required. My solution actually looks a little more like @Eugene’s now, but you want to left join against an inner join. My sub-queries check the phone type and emit (a) a contact id and (b) a line number.

Let me know if this works. I think it should be closer.