Select all items from a table and check if there is corresponding items in another table

Question

i'm trying to workout this problem :
I got a table A of default value and a table B of custom value for certain entities.
For example :
I got my first table of default value here

And i want to select all of them , but i also want the one from the value table B

I can do that for every entry with a simple join, the problem is that i want only the value of the entity #45, So in the end it would look something like that :

If any ones has any idea on how to do this or at least some references it would be greatly appreciated.
Thanks and have a good day!

Answer 1

Use this

SELECT t1.*
 ,t2.value
FROM table1 t1
LEFT JOIN
TableB t2 
ON t1.id = t2.fk_id_setting
And t2.fk_id_entities=45