Table A
| col 1 | col 2 |
|---|---|
| a | b |
| c | d |
Table B
| col 1 | col 2 |
|---|---|
| a | e |
| b | f |
| c | g |
| d | h |
Result :
| col 1 | col 2 |
|---|---|
| e | f |
| g | h |
CodePudding user response：
You can join table B twice such as
SELECT B1.col2 AS col1, B2.col2
FROM A
JOIN B B1
ON B1.col1 = A.col1
JOIN B B2
ON B2.col1 = A.col2