I have a very simple question which is anoying me already for a very long time. I have two tables both with a key field, a common field and a table specic field. Like :
Key,common,spec1
222,AAAA,20000
333,BBBB,0000
444,CCCC,22000
Key,common,spec2
111,EEEE,PRO
222,AAAA,PRV
777,FFFF,PSR
Which I...