用于搜索越来越高级别的SQL冒泡或分层模式

我们有公司、分支机构和用户表/级别。每个级别都有一个与配置表中的配置关联的可空id。如果配置id为null，则它应返回更高级别的配置，并且存在与该更高级别关联的不可为null的id。如果在最高级别没有关联的配置，那么它应该不返回任何内容。另一个复杂性是，配置的IsDeleted值应为0

对于这样的层次结构，什么是好的SQL模式？我确实在网上搜索过这个，但因为我甚至不知道该怎么称呼它，所以没有得到任何有用的结果

我在这里尝试了sql FIDLE:，但我不喜欢我使用的模式。模式只是一组表，每个表都有一个元素，公司是唯一指向配置的公司。 模式：

以下是查询：

    declare @UserID int
select @UserID = 1

declare @uconfigID int
declare @bconfigID int
declare @cconfigID int
declare @numConfigs int
    select @numConfigs = 0  -- UPDATE (makes query work)

SELECT @uconfigID = au.configID, @bconfigID = b.configID, @cconfigID = c.configID
from all_user au 
join branch b on au.branchID = b.ID
join company c on b.companyID = c.ID
where au.ID = @UserID

if @uconfigID is not null
BEGIN
    select @numConfigs = count(*) 
    from config
    where id = @uconfigID
    and IsDeleted = 0

    if @numConfigs = 1
    BEGIN
      select *
      from config
      where id = @uconfigID
      and IsDeleted = 0
    END
END

if @numConfigs = 0 and @bconfigID is not null
BEGIN
    select @numConfigs = count(*) 
    from config
    where id = @bconfigID
    and IsDeleted = 0

    if @numConfigs = 1
    BEGIN
      select * 
      from config
      where id = @bconfigID
      and IsDeleted = 0
    END
END

if @numConfigs = 0 and @cconfigID is not null
BEGIN
    select @numConfigs = count(*) 
    from config
    where id = @cconfigID
    and IsDeleted = 0

    if @numConfigs = 1
    BEGIN
      select *
      from config
      where id = @cconfigID
      and IsDeleted = 0
    END
END

另外，我不喜欢使用联接，因为我真的希望在第一级对它进行短路，以返回有效（非删除）配置

有更好的方法吗？也许是递归的

谢谢

    declare @UserID int
select @UserID = 1

declare @uconfigID int
declare @bconfigID int
declare @cconfigID int
declare @numConfigs int
    select @numConfigs = 0  -- UPDATE (makes query work)

SELECT @uconfigID = au.configID, @bconfigID = b.configID, @cconfigID = c.configID
from all_user au 
join branch b on au.branchID = b.ID
join company c on b.companyID = c.ID
where au.ID = @UserID

if @uconfigID is not null
BEGIN
    select @numConfigs = count(*) 
    from config
    where id = @uconfigID
    and IsDeleted = 0

    if @numConfigs = 1
    BEGIN
      select *
      from config
      where id = @uconfigID
      and IsDeleted = 0
    END
END

if @numConfigs = 0 and @bconfigID is not null
BEGIN
    select @numConfigs = count(*) 
    from config
    where id = @bconfigID
    and IsDeleted = 0

    if @numConfigs = 1
    BEGIN
      select * 
      from config
      where id = @bconfigID
      and IsDeleted = 0
    END
END

if @numConfigs = 0 and @cconfigID is not null
BEGIN
    select @numConfigs = count(*) 
    from config
    where id = @cconfigID
    and IsDeleted = 0

    if @numConfigs = 1
    BEGIN
      select *
      from config
      where id = @cconfigID
      and IsDeleted = 0
    END
END