asked on PHP MySQL and joining two table results
Hi Experts,
I have two tables that rows are linked by the 'PersonRef' field.
Table 'person' example:
PersonRef FirstName LastName
12 Jim Smith
23 Alex Lewis
34 Linda Smith
Table 'person_meta' example:
PersonRef Field Value
12 Age 24
12 Title Mr
23 Age 24
23 Title Mr
34 Age 24
34 Title Mrs
I am looking for a sql query (mysqli_connect) that would return any person who is 'Age' = '24' and 'LastName' = 'Smith' but in an array with this format:
[0] => array('FirstName'=>'Jim','
[1] => array('FirstName'=>'Linda'
So basically searching the two tables and linking the data. Removing PersonRef 23 as they don't have a LastName Smith.
Any help would be gratefully received. I've been going round in circles with Joins.
I have two tables that rows are linked by the 'PersonRef' field.
Table 'person' example:
PersonRef FirstName LastName
12 Jim Smith
23 Alex Lewis
34 Linda Smith
Table 'person_meta' example:
PersonRef Field Value
12 Age 24
12 Title Mr
23 Age 24
23 Title Mr
34 Age 24
34 Title Mrs
I am looking for a sql query (mysqli_connect) that would return any person who is 'Age' = '24' and 'LastName' = 'Smith' but in an array with this format:
[0] => array('FirstName'=>'Jim','
[1] => array('FirstName'=>'Linda'
So basically searching the two tables and linking the data. Removing PersonRef 23 as they don't have a LastName Smith.
Any help would be gratefully received. I've been going round in circles with Joins.
PHPMySQL Server
Last Comment
maccaj51
ASKER CERTIFIED SOLUTION
THIS SOLUTION ONLY AVAILABLE TO MEMBERS.
View this solution by signing up for a free trial.
Members can start a 7-Day free trial and enjoy unlimited access to the platform.
Here is the reference to case
https://dev.mysql.com/doc/refman/5.7/en/case.html
For age
(Case
When f.field='Age' then f.value
Else ''
End case) as Age
For Title
(Case
When f.field='Title' then f.value
Else ' '
End case) As Title
If mo title, you will get an empty string in the corresponding column, but if there is no Age, your query will return no values.
https://dev.mysql.com/doc/refman/5.7/en/case.html
For age
(Case
When f.field='Age' then f.value
Else ''
End case) as Age
For Title
(Case
When f.field='Title' then f.value
Else ' '
End case) As Title
If mo title, you will get an empty string in the corresponding column, but if there is no Age, your query will return no values.
ASKER
Thanks very much.
Select p.firstname,p.adtname,
(Get the title) as title,
(Get the age) as age
From person p join person_meta f on f.petsonref=p.personref
Where f.field='Age' and f.value=24 and p.lastname='Smith'
Group by p.lastname,p.firstname
This way if one is missing, you would still get the results.