Question

我正在试图找出一个将字段值截断为100个字符的select语句，并将...添加到它的末尾，如下所示：

HundredLetterSentence变成了HundredLetter Sen ......或类似的东西。这是我的存储过程中的select语句。我有点被困在这里。选择TOP（1）描述是我想要截断的地方。

SELECT      [TI].[TicketID]
        ,   CAST([TI].[Subject] AS VARCHAR(100)) [Subject]
        ,   [TA].[DueDate]
        ,   CAST(
                    (   SELECT 
                        TOP(1)      SUBSTRING(Description, 0, 100)
                        FROM        Comment 
                        WHERE       TicketID = [TI].[TicketID] 
                        ORDER BY    CommentDate DESC
                    ) AS VARCHAR(100)
                ) AS [Description]
FROM        [dbo].[Ticket]      [TI]
INNER JOIN  [dbo].[Task]        [TA] 
ON          [TI].[TicketID]     = [TA].[TicketID]
INNER JOIN  [dbo].[Task_Status] [TS] 
ON          [TA].[StatusID]     = [TS].[StatusID]
WHERE       [TI].[IsDeleted]    = 0 
AND         [TS].[IsDeleted]    = 0
AND         [TS].[Status]       = 'Open'
AND         [TI].[AssigneeView] IS NULL
AND         [TI].[AssignedTo]   = @AssignedTo

Answer 1

我认为这里最好的方法是创建一个User Defined Function（UDF）。

在这个UDF中你会有类似的东西：

IF LEN(@Value)>100
BEGIN
   SET @Value = SUBSTRING(@Value, 0, 100) + '...'
END
RETURN @Value

然后在你的SELECT声明中，你会这样做：

SELECT [TI].[TicketID], dbo.TruncateString([TI].[Subject]) .....

Answer 2

什么会起作用 -

SELECT CASE 
           WHEN (LEN(Table1.LongText) < 100) THEN Table1.LongText
           ELSE SUBSTRING(Table1.LongText,1, 97) + '...'
       END AS [Description]
FROM Table1;

Answer 3

;WITH x (d, tid, rn) AS
(
  SELECT SUBSTRING(Description, 1, 100) + CASE
    WHEN LEN(Description) > 100 THEN '...' ELSE '' END,
    TicketID, rn = ROW_NUMBER() OVER
    (PARTITION BY TicketID ORDER BY CommentDate DESC)
    FROM dbo.Comment
)
SELECT [TI].[TicketID], 
  CAST([TI].[Subject] AS VARCHAR(100)) [Subject], 
  [TA].[DueDate], 
  x.d AS [Description]
    FROM     [dbo].[Ticket] [TI]
             INNER JOIN [dbo].[Task] [TA] ON [TI].[TicketID] = [TA].[TicketID]
             INNER JOIN [dbo].[Task_Status] [TS] ON [TA].[StatusID] = [TS].[StatusID]
    LEFT OUTER JOIN x ON TI.TicketID = x.tid
    AND x.rn = 1 -- oops, forgot this important part
    WHERE    [TI].[IsDeleted] = 0 AND
             [TS].[IsDeleted] = 0 AND
             [TS].[Status] = 'Open' AND
             [TI].[AssigneeView] IS NULL AND
             [TI].[AssignedTo] = @AssignedTo;

Answer 4

你是否需要所有字段都有'...'或者只有那些实际上超过100个字符的字段。如果您需要所有，您可以执行以下操作：

select substring(name,0,97)+'...' from...

如何截断字段并将“...”附加到其中？

4 个答案: