Wordpress - fetch data from multiple tables - mysql

Question

I have these two different tables (wp_usermeta & my cutom table-sia_licence):
wp_usermeta table:-
sia_licence table(custom):-
and I want final data table to be like this:-
We tried using
$data = $wpdb->get_results("SELECT * FROM wp_usermeta, sia_licence WHERE wp_usermeta.user_id = sia_user_id
AND wp_usermeta.meta_key = 'first_name'
AND wp_usermeta.meta_key = 'last_name'
AND wp_usermeta.meta_key = 'phone_number'
AND wp_usermeta.meta_key = 'email'
AND wp_usermeta.meta_key = 'address'");
but getting blank array..

Answer 1

You need to perform conditional aggregation on wp_usermeta in order to pivot all attributes (first name, last name, ...) per user_id and then JOIN with sia_licence to produce desired output
SELECT q.user_id, q.first_name, q.last_name, q.email, q.phone_number, q.address,
l.select_licence, l.visa_expiry, l.licence_number, l.sia_licence, l.driving_licence
FROM
(
SELECT user_id,
MAX(CASE WHEN meta_key = 'first_name' THEN meta_value END) first_name,
MAX(CASE WHEN meta_key = 'last_name' THEN meta_value END) last_name,
MAX(CASE WHEN meta_key = 'phone_number' THEN meta_value END) phone_number,
MAX(CASE WHEN meta_key = 'email' THEN meta_value END) email,
MAX(CASE WHEN meta_key = 'address' THEN meta_value END) address
FROM wp_usermeta m
WHERE EXISTS
(
SELECT *
FROM sia_licence
WHERE sia_user_id = m.user_id
)
GROUP BY user_id
) q JOIN sia_licence l
ON q.user_id = l.sia_user_id
or join first and then aggregate
SELECT q.user_id,
MAX(CASE WHEN meta_key = 'first_name' THEN meta_value END) first_name,
MAX(CASE WHEN meta_key = 'last_name' THEN meta_value END) last_name,
MAX(CASE WHEN meta_key = 'phone_number' THEN meta_value END) phone_number,
MAX(CASE WHEN meta_key = 'email' THEN meta_value END) email,
MAX(CASE WHEN meta_key = 'address' THEN meta_value END) address,
MAX(select_licence) select_licence,
MAX(visa_expiry) visa_expiry,
MAX(licence_number) licence_number,
MAX(sia_licence) sia_licence,
MAX(driving_licence) driving_licence
FROM wp_usermeta q JOIN sia_licence l
ON q.user_id = l.sia_user_id
GROUP BY q.user_id

Answer 2

try this:
SELECT * FROM wp_usermeta wu
INNER JOIN sia_licence sl ON wu.user_id = sl.sia_user_id
WHERE <you can specify your filter here>;

Answer 3

Does sla_user_id reference user_id?
if so you want to use a JOIN like this...
SELECT um.*,sl.select_licence,sl.visa_expiry,sl.licence_number,sl.sia_licence,sl.driving_licence FROM `wp_usermeta`um JOIN `sia_licence`sl ON um.`user_id`=sl.`sia_user_id`;
You can also add a where clause like this
SELECT um.*,sl.select_licence,sl.visa_expiry,sl.licence_number,sl.sia_licence,sl.driving_licence FROM `wp_usermeta`um JOIN `sia_licence`sl ON um.`user_id`=sl.`sia_user_id` WHERE um.`user_id`=101;
if neeeded. IN the above example it would just return user ID = 101.
You can also just use SELECT *, in this case, but generally it's a bad idea because if there are any ambigious columns (columns with the same names) between the two tables it'll give you an error, but in your case it looks like you should be fine with:
SELECT * FROM `wp_usermeta`um JOIN `sia_licence`sl ON um.`user_id`=sl.`sia_user_id`;