Sub Query or Nested. I really dont know. maybe neither - mysql

Question

OK, I may have missed this in the search, but I am unsure of what I am looking for. I have a couple of tables that I need ti generate mailing labels from. Main table has name and surname. Then a second table has multiple rows for data like phon-123415324, address 1- 1 james st etc...There is also a table that bind the data. Here is an example result and the query.
SELECT
users.name,
users.surname,
details.`field`,
details.value
FROM
users
Inner Join details ON details.user_id = users.id
Inner Join bookings ON bookings.guest_id = users.id
WHERE
bookings.sub_event_id = '78'
NAME, SURNAME, field, value
David Oden title Mr
David Oden sex Male
David Oden mobile [phone]
David Oden company Fterns Group
David Oden position
David Oden address_1 Cnr wtrewr Rd & wert St
David Oden address_2
David Oden suburb wertt Mile wertw
David Oden state MAS
David Oden postcode 14113
David Oden country USA
WHAT I need I all the data i 1 row to export to excel for mailing labels. Sorry if this is really dumb. I have spent about 4 hours researching with no luck.
I need the type to be a column header and the value to be the data.
Shoud read
Title | Name | Surname | Mobile | Company | Address etc.....
MR | David | Oden | 0534600594 | Fterns Group | etc....
Any help would be appreciated/

Answer 1

This is known as a PIVOT function but unfortunately MySQL does not have a PIVOT, so you will have to replicate it use an aggregate function an a CASE statement. If you know the values that you need to include in the query, then you can hard-code them similar to the following:
select
min(case when d.field = 'title' then d.value end) as Title,
u.name,
u.surname,
min(case when d.field = 'sex' then d.value end) as Sex,
min(case when d.field = 'mobile' then d.value end) as Mobile,
min(case when d.field = 'company' then d.value end) as Company,
min(case when d.field = 'position' then d.value end) as Position,
min(case when d.field = 'address_1' then d.value end) as Address_1,
min(case when d.field = 'address_2' then d.value end) as Address_2,
min(case when d.field = 'suburb' then d.value end) as suburb,
min(case when d.field = 'state' then d.value end) as State,
min(case when d.field = 'postcode' then d.value end) as Postcode,
min(case when d.field = 'country' then d.value end) as country
from users u
left join details d
on u.id = d.id
left join bookings b
on u.id = b.guest_id
where b.sub_event_id = 78
group by u.name, u.surname
See SQL Fiddle with demo
But if you have an unknown number of columns or if the value will change, then you will want to perform this dynamically, then you should read the following article on prepared statements:
Dynamic pivot tables (transform rows to columns)
Your code would look like this:
SET #sql = NULL;
SELECT
GROUP_CONCAT(DISTINCT
CONCAT(
'min(case when d.field = ''',
d.field,
''' then d.value end) AS ',
d.field
)
) INTO #sql
from users u
left join details d
on u.id = d.d_id;
SET #sql = CONCAT('SELECT u.name,
u.surname, ', #sql, '
from users u
left join details d
on u.id = d.d_id
left join bookings b
on u.id = b.guest_id
where b.sub_event_id = 78
group by u.name, u.surname');
PREPARE stmt FROM #sql;
EXECUTE stmt;
DEALLOCATE PREPARE stmt;
See SQL Fiddle with Demo