sort a b descending 不能按照A B都降序排
Syntax
SORT itab [STABLE]
{ { [ASCENDING|DESCENDING]
[AS TEXT]
[BY { [ASCENDING|DESCENDING] [AS TEXT]}
{ [ASCENDING|DESCENDING] [AS TEXT]}
... ] }
| { [BY (otab)] } }.
解决:sort a descending b descending