Question

I know this question has already asked here, but I can’t figure this one out from the previous answers.

We’ve got 2 tables:

members
-----------------------
| id | country_iso_3 |
-----------------------
  1    USA
  2    DZA
  3    FRA
  4    ILI
  5    USA
  6    USA


members_details
-----------------------
| member_id | city    |
-----------------------
  1          AA
  2          BB
  3          CC
  4          DD
  5          EE
  6          FF

Now I want to query members_details and select the cities which are from the same countries, here “AA”, “EE” and “FF” should be the results (because the members are from USA)

I know how to compare different cols from different tables, but here we need to check the second table ‘member_id’ and the first table ‘id (country_iso_3)’ somehow!

Answer 1

Select city from members LEFT JOIN members_details 
ON members.id = members_details.memberid Where country_iso_3 = 'USA'