Echo Column with Same Name - PHP/MYSQL Left Join

Question

So i have a left join query but both of my tables have some of the same column names. I am wondering how to specifically call one of the columns. My query looks like this:

SELECT * FROM Contacts AS Contacts LEFT JOIN Events AS Events ON Contacts.PK = 
Events.Realted_Contact

So these tables have columns that are the same. For example, both tables have a PK column for their primary key. Right now when i echo $row['PK'] it only returns the Events PK and not the Contacts PK. Im trying to do something like this but it's not working:

echo $row['Contacts.PK']; 

But when I do this it's echoing nothing. How can i echo a column that has the same name as another column in the join. Thank you for any help.

Answer 1

Use AS in the SELECT statament of the query

SELECT Contacs.*, Events.PK AS EventsPK FROM Contacts AS Contacts LEFT JOIN Events AS Events ON Contacts.PK = Events.Realted_Contact

And then access the value like this

echo $row['EventsPK']; 

Be ware that you are using LEFT JOIN and the Event's columns could be NULL

Answer 2

给列起这样的别名：

SELECT Contacts.PK as Contacts_PK...

Answer 3

Query result you can check by using print_r function. Example as print_r(query result);

SELECT Contacts.PK as contact_pk FROM Contacts AS Contacts LEFT JOIN Events AS Events ON Contacts.PK = Events.Realted_Contact