select (case when a>b then a else b end ),
(case when b>c then b esle c end)
from table_nameorselect greatest(a, b),
greatest(b, c)
from table_name
(case when b>c then b esle c end)
from table_nameorselect greatest(a, b),
greatest(b, c)
from table_name
解决方案 »
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