积分result表中有A B C D四列,要求:
1)当A列值大于等于B列时,选择A列否则选择B列
2)当C列值大于等于D列时,选择C列否则选择D列
用SQL语句实现正确的是:( )
select ( when A >=B then A else B ) MAX_AB, ( when C>=D then C else D ) MAX_CD from result
select (case when A>=B then A else B ) MAX_AB, (case when C>=D then C else D ) MAX_CD from result
select (case when A>=B then A else B end) MAX_AB, (case when C>=D then C else D end) MAX_CD from result
select case when A>=B then A else B end MAX_AB, case when C>=D then C else D end MAX_CD from result