SQL Query for related Table with pair of id´s from another table (show names instead id´s)

Question

I have two related Tables. The first table (tbl1) is like

ID | name

• 1 | X
• 2 | Y
• . |.
• . |.
• . |.

And the second table (tbl2)

ID1 | ID2

• 2 | 1
• . |.
• . |.
• . |.

So, I try to write a SQL Query to show me the names like this:

Name1 | Name2

• Y | X
• . |.
• . |.
• . |.

I tried this SQL:

SELECT tbl1.name, tbl1.name FROM tbl2
INNER JOIN tbl1 ON tbl2.id_tbl1 = tbl1.id
INNER JOIN tbl1 AS t1 ON tbl2.id_tbl1 = t1.id;

But it doesn´t work. Can someone show me a SQL Query for my problem please?

Answer 1

Two joins are the right way to go. But you need to refer to the aliases:

SELECT t1_1.name, t1_2.name
FROM tbl2 t2 JOIN
     tbl1 t1_1
     ON t2.id_tbl1 = t1_1.id JOIN
     tbl1 t1_2 
     ON t2.id_tbl1 = t1_2.id;