MySql. How to use Self Join

Question

I need to use Self Join on this table.

+------------+------+--------+
| Country    | Rank |  Year  |
+------------+------+--------+
|France      |  55  |  20         


        

Answer 1

Change a.Country = 'Turkey' to b.Country = 'Turkey'

You have SELECT DISTINCT a.Country, but your condition is a.Country = 'Turkey'. Even if you do get multiple rows, they are filtered by the DISTINCT