取唯一grpid

ZZ HK SCG0003 1 LIN 801
ZZ HK SCG0003 1 HGL KEYLOOK
ZZ HK SCG0003 1 CAT DRS

ZZ HK SCG0008 2 LIN 801
ZZ HK SCG0008 2 CAT DRS
ZZ HK SCG0008 2 HGL MUSTHAVE

 

SELECT LVL1.M142ILVLGRPID
FROM
(SELECT M142ILVLGRPID FROM ZTM142I WHERE M142ICOMCOD='ZZ' AND M142ISCGNUM='SCG0003' AND M142IMKTGRP='HK' AND M142IPLUATB='LIN' AND M142IATBCOD='801') LVL1,
(SELECT M142ILVLGRPID FROM ZTM142I WHERE M142ICOMCOD='ZZ' AND M142ISCGNUM='SCG0003' AND M142IMKTGRP='HK' AND M142IPLUATB='HGL' AND M142IATBCOD='KEYLOOK') LVL2,
(SELECT M142ILVLGRPID FROM ZTM142I WHERE M142ICOMCOD='ZZ' AND M142ISCGNUM='SCG0003' AND M142IMKTGRP='HK' AND M142IPLUATB='CAT' AND M142IATBCOD='DRS') LVL3
WHERE LVL1.M142ILVLGRPID = LVL2.M142ILVLGRPID AND LVL2.M142ILVLGRPID = LVL3.M142ILVLGRPID