クエリは次のようになります。
select substr('P_A_VA1234_1_EE',(INSTR('P_A_VA1234_1_EE','_',1,2)+1),(INSTR('P_A_VA1234_1_EE','_',1,4)-(INSTR('P_A_VA1234_1_EE','_',1,2)+1)))original from dual
select substr(shipment_gid,(INSTR(shipment_gid,'_',1,2)+1),(INSTR(shipment_gid,'_',1,4)-(INSTR(shipment_gid,'_',1,2)+1)))original from dual
SUBSTR(S.SHIPMENT_GID,8,8) LOADID,
select substr(shipment_gid,(INSTR(shipment_gid,'_',1,2)+1),(INSTR(shipment_gid,'_',1,4)-(INSTR(shipment_gid,'_',1,2)+1)))load,shipment_gid from shipment where shipment_gid like '%DHL/CLS.CLS_CV_%';
SUBSTR(S.SHIPMENT_GID,(INSTR(S.SHIPMENT_GID,'_',1,2)+1),(INSTR(S.SHIPMENT_GID,'_',1,4)-(INSTR(S.SHIPMENT_GID,'_',1,2)+1)))