with t as (
select 10 c1, 20 c2, 30 c3, 40 c4 from dual union all
select 50, 30, 20, 10 from dual union all
select 30, 20, 60, 30 from dual
)
select c1, c2, c3, c4, greatest (c1,c2,c3,c4) from t
댓글등록
SQL문을 포맷에 맞게(깔끔하게) 등록하려면 code() 버튼을 클릭하여 작성 하시면 됩니다.