SQL面试题：有A B C三列,用SQL语句实现：当A列大于B列时选择A列否则选择B列

.请教一个面试中遇到的SQL语句的查询问题
表中有A B C三列,用SQL语句实现：当A列大于B列时选择A列否则选择B列，当B列大于C列时选择B列否则选择C列。
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select (case when a>b then a else b end ),
(case when b>c then b esle c end)
from table_name

drop table table1
create table table1(
    a int,
    b int,
    c int
)
insert into table1 values(22,24,23)

select * from table1

select (case when a>b then a else b end),(case when b>c then b else c end)
from table1

select (case when a>b then a
             when a>c then a
             when b>c then b else c
             end)
from table1