I have two tables like these;
LIB NAME SRCLIB SRCFILE SRCMBR
--- ---- ------ ------- ------
fd ds fds ee aw
aa aa aa aa aa
we nb ty ya as
bv sd de aa as

and

SRCLIBB SRCFILEB SRCMBRB
------- -------- -------
de aa as
ty aa as
.
SRCLIB=SRCLIBB
SRCFILE=SRCFILEB
SRCMBR=SRCMBRB
and I want to see lib and name where not in second table.
At last, I want to see

LIB NAME
--- ----
fd ds
aa aa
we nb

.

I did it

SELECT A.LIB, A."NAME" FROM BUSRA.ATABLE AS A EXCEPT SELECT ATA
BLE.LIB, ATABLE."NAME" FROM BUSRA.ATABLE AS ATABLE, BUSRA.BTABLE AS BTABLE wHERE ATABLE.SRCLIB = BTA
BLE.SRCLIBB AND ATABLE.SRCFILE = BTABLE.SRCFILEB AND ATABLE.SRCMBR = BTABLE.SRCMBRB