SQL 2012 Group By Rollup, Grouping

GO
alter proc [zsp_BranchsData]
as
begin
/*
    CREATE TABLE [原始机构数据]
    (
        [序号]                [varchar](50) NULL,
        [一级分行号]            [varchar](50) NULL,
        [一级分行名称]        [varchar](50) NULL,
        [二级分行号]            [varchar](50) NULL,
        [二级分行名称]        [varchar](50) NULL,
        --[上级机构号]        [varchar](50) NULL,
        --[上级机构名称]        [varchar](50) NULL,
        --[责任中心号]        [varchar](50) NULL,
        --[责任中心名称]        [varchar](50) NULL
    )
*/
    SELECT
        --GROUPING([一级分行号])
        --, 
        [一级分行号]        =
                            iif
                                (
                                    GROUPING([一级分行号]) = 1
                                    , '合计:'
                                    , [一级分行号]
                                ) ,
        [一级分行名称]    =
                            iif
                                (
                                    GROUPING([一级分行号]) = 1
                                    ,
                                        cast
                                            (
                                                count(distinct [一级分行号]) as varchar
                                            )
                                    , max([一级分行名称])
                                ) , 
        [二级分行数量]    = count(distinct [二级分行号])
    FROM
        [原始机构数据]
    group by
        --[一级分行号]
        rollup
            (
                [一级分行号]
            )
    order by
        GROUPING([一级分行号])
        , [一级分行号]
    select
        [二级分行号] ,
        [二级分行名称]    = max([二级分行名称]) ,
        [一级分行号]        = max([一级分行号]) ,
        [一级分行名称]    = max([一级分行名称])
    from
        [原始机构数据]
    group by
        [二级分行号]
    order by
        3
;with T
as
(
    SELECT
        [一级分行组]            = GROUPING([一级分行号]) ,
        [全辖一级分行序号]    = DENSE_RANK()
                                over
                                    (
                                        order by
                                            [一级分行号]
                                    ) - 1 ,
        [一级分行号]            =
                                iif
                                    (
                                        GROUPING([一级分行号]) = 1
                                        , '全部合计:'
                                        , [一级分行号]
                                    ) ,
        [一级分行名称]        =
                                case
                                    when
                                        GROUPING([一级分行号]) = 1
                                            then
                                                cast(count(distinct [一级分行号]) as varchar)
                                    when
                                        GROUPING([二级分行号]) = 1
                                        and GROUPING([一级分行号]) = 0
                                            then
                                                max([一级分行名称]) + ' 分组'
                                    else
                                        max([一级分行名称])
                                end ,
        [二级分行组]            = GROUPING([二级分行号]) ,
        [辖内二级分行序号]    = ROW_NUMBER()
                                    over
                                        (
                                            partition by
                                                [一级分行号]
                                            order by
                                                [二级分行号]
                                        ) - 1 ,
        [二级分行号]            =
                                case
                                    when
                                        GROUPING([一级分行号]) = 1
                                        and GROUPING([二级分行号]) = 1
                                            then
                                                '全部合计:'
                                    when
                                        GROUPING([二级分行号]) = 1
                                            then
                                                '分组小计:'
                                    else
                                        [二级分行号]
                                end ,
        [二级分行名称]        =
                                iif
                                    (
                                        GROUPING([二级分行号]) = 1
                                        , cast(count(distinct [二级分行号]) as varchar)
                                        , max([二级分行名称])
                                    )
    FROM
        [原始机构数据]
    group by
        --[一级分行号]
        rollup
            (
                [一级分行号]
                , [二级分行号]
            )
)
select
    --[一级分行组] ,
    [全辖一级分行序号] ,
    [一级分行号] ,
    [一级分行名称] ,
    --[二级分行组] ,
    [辖内二级分行序号] ,
    [二级分行号] ,
    [二级分行名称]
from
    T
order by
    [一级分行号] ,
    [一级分行组] ,
    [二级分行号] ,
    [二级分行组]
end