declarex number:=0;beginfor x in 1..2000 loopif(x<=100) theninsert into TT values(system.XL.nextval,5000);else if(x>100) and(x<301) theninsert into TT values(system.XL.nextval,4000);else if(x>300)and(x<1301) theninsert into TT values(system.XL.nextval,3000);elseinsert into TT values(system.XL.nextval,2500);end if;end loop;end;
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