Question

I have a mapping table tableA

key   value
----------- 
1     "John"
2     "George"
3     "Kate"
4     "loves"
5     "hates"

and another tableB that contains rows based on keys of tableA

col1   col2   col3
------------------
1      5      2
2      4      3
3      4      1

I want to write a selection query which will return rows from table B but replaced with their appropriate values.

e.g. the output has to be:

John   | hates | George
George | loves | Kate
Kate   | loves | John

Thank you.

Answer 1

SELECT A1.value, A2.value, A3.value 
FROM tableB 
JOIN tableA as A1 ON tableB.col1 = A1.key 
JOIN tableA as A2 ON tableB.col2 = A2.key 
JOIN tableA as A3 ON tableB.col3 = A3.key;