[英]SQL Server RTRIM(LTRIM([City])) not stripping whitespace
在對一個sproc進行故障排除后,我意識到這些字段有一個額外的字符,我假設是空白或者某些特殊字符不可見 例如,city字段包含值'Abbeville',其長度(LEN([city])為10.我以為我可以使用以下內容修剪空白區域:
UPDATE US_City_State
SET [City] = RTRIM(LTRIM([City]))
那沒用。 我轉向varbinary但我不知道該怎么做。 該列定義為nvarchar。 這是演員價值。
0x4100620062006500760069006C006C006500A000
[更新]樣本數據
City City_Hex_Value
Aaronsburg 0x4100610072006F006E0073006200750072006700A000
Abbeville 0x4100620062006500760069006C006C006500A000
謝謝!
也許空白不僅僅是一個空間:
嘗試這個:
UPDATE US_City_State
SET [City] = LTRIM(RTRIM(REPLACE(REPLACE(REPLACE(REPLACE([City], CHAR(10), ''), CHAR(13), ''), CHAR(9), ''), CHAR(160), '')))
說明:某些空格不是空格('')。 以下是一些空白:
CHAR(9) = Horizontal Tab
CHAR(10) = Line Feed
CHAR(13) = Carriage Return
CHAR(160) = Non-Breaking Space
我做的是刪除上面的空格。 您可以用空格('')或CHAR(32)
替換它,具體取決於您想要如何處理它們。
TRIM
所有SPACE
的TAB
和ENTER
的:
DECLARE @Str VARCHAR(MAX) = '
[ Foo ]
'
DECLARE @NewStr VARCHAR(MAX) = ''
DECLARE @WhiteChars VARCHAR(4) =
CHAR(13) + CHAR(10) -- ENTER
+ CHAR(9) -- TAB
+ ' ' -- SPACE
;WITH Split(Chr, Pos) AS (
SELECT
SUBSTRING(@Str, 1, 1) AS Chr
, 1 AS Pos
UNION ALL
SELECT
SUBSTRING(@Str, Pos, 1) AS Chr
, Pos + 1 AS Pos
FROM Split
WHERE Pos <= LEN(@Str)
)
SELECT @NewStr = @NewStr + Chr
FROM Split
WHERE
Pos >= (
SELECT MIN(Pos)
FROM Split
WHERE CHARINDEX(Chr, @WhiteChars) = 0
)
AND Pos <= (
SELECT MAX(Pos)
FROM Split
WHERE CHARINDEX(Chr, @WhiteChars) = 0
)
SELECT '"' + @NewStr + '"'
CREATE FUNCTION StrTrim(@Str VARCHAR(MAX)) RETURNS VARCHAR(MAX) BEGIN
DECLARE @NewStr VARCHAR(MAX) = NULL
IF (@Str IS NOT NULL) BEGIN
SET @NewStr = ''
DECLARE @WhiteChars VARCHAR(4) =
CHAR(13) + CHAR(10) -- ENTER
+ CHAR(9) -- TAB
+ ' ' -- SPACE
IF (@Str LIKE ('%[' + @WhiteChars + ']%')) BEGIN
;WITH Split(Chr, Pos) AS (
SELECT
SUBSTRING(@Str, 1, 1) AS Chr
, 1 AS Pos
UNION ALL
SELECT
SUBSTRING(@Str, Pos, 1) AS Chr
, Pos + 1 AS Pos
FROM Split
WHERE Pos <= LEN(@Str)
)
SELECT @NewStr = @NewStr + Chr
FROM Split
WHERE
Pos >= (
SELECT MIN(Pos)
FROM Split
WHERE CHARINDEX(Chr, @WhiteChars) = 0
)
AND Pos <= (
SELECT MAX(Pos)
FROM Split
WHERE CHARINDEX(Chr, @WhiteChars) = 0
)
END
END
RETURN @NewStr
END
-- Test
DECLARE @Str VARCHAR(MAX) = '
[ Foo ]
'
SELECT 'Str', '"' + dbo.StrTrim(@Str) + '"'
UNION SELECT 'EMPTY', '"' + dbo.StrTrim('') + '"'
UNION SELECT 'EMTPY', '"' + dbo.StrTrim(' ') + '"'
UNION SELECT 'NULL', '"' + dbo.StrTrim(NULL) + '"'
結果
+-------+----------------+
| Test | Result |
+-------+----------------+
| EMPTY | "" |
| EMTPY | "" |
| NULL | NULL |
| Str | "[ Foo ]" |
+-------+----------------+
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