TSQL计算列限制

Question

CREATE TABLE [dbo].[MembershipModule](
 [Id] [uniqueidentifier] ROWGUIDCOL  NOT NULL,
 [ParentId] [uniqueidentifier] NULL,
 [TargetId] [int] NULL,
 [WebContentId] [uniqueidentifier] NULL,
 [Name] [varchar](35) NOT NULL,
 [NameUpper]  AS (isnull(upper([Name]),'')) PERSISTED NOT NULL,
 [UriPrefix] [varchar](max) NULL,
 [UriText] [varchar](max) NULL,
 [UriComputed]  AS ??? PERSISTED,
 [Description] [varchar](100) NULL,
 [Created] [date] NOT NULL,
 [Modified] [datetime2](7) NOT NULL,
 [MenuItem] [bit] NOT NULL,
 [Enabled] [bit] NOT NULL,
 [Position] [smallint] NULL,
 CONSTRAINT [PK_MembershipModule] PRIMARY KEY CLUSTERED 
(
 [Id] ASC
)WITH (PAD_INDEX  = OFF, STATISTICS_NORECOMPUTE  = OFF, IGNORE_DUP_KEY = OFF, ALLOW_ROW_LOCKS  = ON, ALLOW_PAGE_LOCKS  = ON) ON [PRIMARY]
) ON [PRIMARY]

到目前为止，UriComputed字段的计算如下：

lower(replace(isnull([UriPrefix],'/')+coalesce([UriText],[Name]),' ','-'))

这会产生如下输出

现在，我想用'/'终止所有UriComputed值。通过向计算字段添加+ '/'可以很容易地实现这一点，除了“无文字”uris将像//一样终止这一事实，我不想发生这种情况。

因为我可以放入计算字段的sql非常有限（而且我真的不知道这些限制的范围）我想我会问这里如何添加它。

基本上我希望图像中的输出为

/a/login/
/a/announcements/
/a/
/

我最近的尝试是：

isnull(convert(varchar(MAX),nullif(len(coalesce([UriText],[Name])),0)),'/')

哪种情况有点混乱，如果它应以'/'结尾，则添加一个数字，并在应该添加'/'时，我需要的是相反的（即长度为'/'）是0，'否则）

如果有一个内联的if或类似的东西我可以使用它基本上是它，但我不知道。

谢谢！

Answer 1

这对我有用：

[UriComputed]  AS (CASE 
                     WHEN RIGHT(lower(replace(isnull([UriPrefix],'/')+coalesce([UriText],[Name]),' ','-')), 1) = '/' THEN
                       lower(replace(isnull([UriPrefix],'/')+coalesce([UriText],[Name]),' ','-'))
                     ELSE
                       lower(replace(isnull([UriPrefix],'/')+coalesce([UriText],[Name]),' ','-')) +'/'
                   END) PERSISTED,

完整的CREATE TABLE语句：

CREATE TABLE [dbo].[MembershipModule](
 [Id] [uniqueidentifier] ROWGUIDCOL  NOT NULL,
 [ParentId] [uniqueidentifier] NULL,
 [TargetId] [int] NULL,
 [WebContentId] [uniqueidentifier] NULL,
 [Name] [varchar](35) NOT NULL,
 [NameUpper]  AS (isnull(upper([Name]),'')) PERSISTED NOT NULL,
 [UriPrefix] [varchar](max) NULL,
 [UriText] [varchar](max) NULL,
 [UriComputed]  AS (CASE 
                     WHEN RIGHT(lower(replace(isnull([UriPrefix],'/')+coalesce([UriText],[Name]),' ','-')), 1) = '/' THEN
                       lower(replace(isnull([UriPrefix],'/')+coalesce([UriText],[Name]),' ','-'))
                     ELSE
                       lower(replace(isnull([UriPrefix],'/')+coalesce([UriText],[Name]),' ','-')) +'/'
                    END) PERSISTED,
 [Description] [varchar](100) NULL,
 [Created] [date] NOT NULL,
 [Modified] [datetime2](7) NOT NULL,
 [MenuItem] [bit] NOT NULL,
 [Enabled] [bit] NOT NULL,
 [Position] [smallint] NULL)