sql中行数据，层级显示
列明：一级 二级 三级
值 ：a b e
a f
c d x
c h
显示：
级别 值
1 a
2 b
3 e
2 f
1 c
2 d
3 x
2 h
[解决办法]
declare @test table(一级 varchar(1), 二级 varchar(1), 三级 varchar(1))insert into @testselect 'a', 'b', 'e' union allselect 'a', 'f', '' union allselect 'c', 'd', 'x' union allselect 'c', 'h', '';with cte as( select row_number() over(order by 一级) rn,* from @test),t as( select row_number() over(order by rn,级别)id,级别,值 from ( select rn,一级 as 值,1 级别 from cte union all select rn,二级,2 from cte union all select rn,三级,3 from cte )t where 值<>'')select 级别,值 from t awhere not exists(select 1 from t where a.id>id and 级别=a.级别 and 值=a.值)order by id/*级别 值----------- ----1 a2 b3 e2 f1 c2 d3 x2 h*/
