[英]Find the column(s) with values which has special characters using SQL
我在數據庫中有一些表,如下所述。
**Table1**
+-------+--------------+-------------+
|**ID** |**Name** |**Country** |
+-------+--------------+-------------+
| 1 |Avinash Kumar |India |
| 2 |Sat!sh@S |USA |
| 3 |$32kjs |UK |
| 4 |#$@@@ |AFRICA |
| 5 |Krishnas_has |USA |
+-------+--------------+-------------+
**Table2**
+-------+--------------+-------------+-----------+
|**ID** |**Name1** |**Country1** |**Region1**|
+-------+--------------+-------------+-----------+
| 1 |Avinash Kumar |India |EMEA |
| 2 |Sat!sh@S |USA |ASIA@@ |
| 3 |$32kjs |UK |EU._A |
| 4 |#$@@@ |AFRICA |HAS&# |
| 5 |Krishnas_has |USA |KALc!! |
+-------+--------------+-------------+-----------+
**Table3**
+-------+--------------+-------------+-----------+-----------+
|**ID** |**Name2** |**Country2** |**Region2**|**State2** |
+-------+--------------+-------------+-----------+-----------+
| 1 |Avinash.Kumar |India$ |EMEA |BANG_& |
| 2 |Sat!sh@S |US!!A |ASIA@@ |SO$TH |
| 3 |$32kjs |U@K |EU._A |TRUTH |
| 4 |#$@@@ |AFRICA |HAS |HAPPY |
| 5 |Krishnas_has |USA# |KALc!! |!ASDF# |
+-------+--------------+-------------+-----------+-----------+
還有一件事就像我想將表名作為變量傳遞。 像這樣
Declare @Table Select * from @Table
我在@Table中傳遞的代碼必須能夠動態工作
現在,如果我通過@Table = Table3,如何查找特殊字符列
例如:當我想在Table3中查找特殊字符時,我的輸出應該是這樣的
**EXPECTED OUTPUT**
+-------+--------------+-------------+-----------+-----------+
|**ID** |**Name2** |**Country2** |**Region2**|**State2** |
+-------+--------------+-------------+-----------+-----------+
| 1 |Avinash.Kumar |India$ | |BANG_& |
| 2 |Sat!sh@S |US!!A |ASIA@@ |SO$TH |
| 3 |$32kjs |U@K |EU._A | |
| 4 |#$@@@ | | | |
| 5 |Krishnas_has |USA# |KALc!! |!ASDF# |
+-------+--------------+-------------+-----------+-----------+
有人可以幫我嗎?
提前致謝!
看一下這種方法:
CREATE TABLE Test (
ID INT,
Name2 NVARCHAR(100),
Country2 NVARCHAR(100),
Region2 NVARCHAR(100),
State2 NVARCHAR(100)
)
GO
DELETE test
INSERT INTO Test VALUES(1, 'Avinash.Kumar', 'India$', 'EMEA', 'BANG_&'), (2, 'Sat!sh@S', 'US!!A', 'ASIA', 'SO$TH'), (3, 'Test1', 'Test2', 'Test3', 'Test4')
GO
CREATE FUNCTION chkStrg4Chars(@InputString NVARCHAR(4000)) RETURNS NVARCHAR(4000)
AS
BEGIN
DECLARE @RetVal NVARCHAR(4000);
SET @RetVal = CASE WHEN @InputString LIKE '%[^A-Za-z0-9 .]%' THEN @InputString ELSE NULL END;
RETURN @RetVal
END;
GO
CREATE PROCEDURE chkTableColumns4Chars(@InputTable NVARCHAR(500))
AS
BEGIN
DECLARE @ColList NVARCHAR(MAX);
DECLARE @ColListNonC NVARCHAR(MAX);
DECLARE @ColListRes NVARCHAR(MAX);
DECLARE @ColListPiv NVARCHAR(MAX);
SELECT @ColList = (SELECT CASE WHEN t.name IN ('nvarchar','varchar') THEN 'dbo.chkStrg4Chars(' + c.name + ') AS ' + c.name ELSE c.name END + ','
FROM sys.columns c
JOIN sys.types t ON c.system_type_id = t.system_type_id AND c.user_type_id = t.user_type_id
WHERE c.object_id = OBJECT_ID(@InputTable)
ORDER BY c.column_id
FOR XML PATH('')
);
SET @ColList = SUBSTRING(@ColList, 1, LEN(@ColList)-1);
SELECT @ColListRes = (SELECT 'MAX(' + c.name + ') AS ' + c.name + ','
FROM sys.columns c
JOIN sys.types t ON c.system_type_id = t.system_type_id AND c.user_type_id = t.user_type_id
WHERE c.object_id = OBJECT_ID(@InputTable)
AND t.name IN ('nvarchar','varchar')
ORDER BY c.column_id
FOR XML PATH('')
);
SET @ColListRes = SUBSTRING(@ColListRes, 1, LEN(@ColListRes)-1);
SELECT @ColListNonC = (SELECT c.name + ','
FROM sys.columns c
JOIN sys.types t ON c.system_type_id = t.system_type_id AND c.user_type_id = t.user_type_id
WHERE c.object_id = OBJECT_ID(@InputTable)
AND t.name NOT IN ('nvarchar','varchar')
ORDER BY c.column_id
FOR XML PATH('')
);
SELECT @ColListPiv = (SELECT c.name + ','
FROM sys.columns c
JOIN sys.types t ON c.system_type_id = t.system_type_id AND c.user_type_id = t.user_type_id
WHERE c.object_id = OBJECT_ID(@InputTable)
AND t.name IN ('nvarchar','varchar')
ORDER BY c.column_id
FOR XML PATH('')
);
SET @ColListPiv = SUBSTRING(@ColListPiv, 1, LEN(@ColListPiv)-1);
DECLARE @stmt NVARCHAR(MAX) = 'SELECT ' + @ColList + ' INTO #TTest1 FROM ' + @InputTable + ';
DECLARE @SubCol nvarchar(max) = (SELECT ColName + ' + CHAR(39) + ',' + CHAR(39) + ' FROM (SELECT ' + @ColListRes + ' FROM #TTest1) x UNPIVOT (StrVal FOR ColName in (' + @ColListPiv + '))u FOR XML PATH('+CHAR(39)+CHAR(39)+'));
SET @SubCol = SUBSTRING(@SubCol, 1, len(@SubCol)-1)
DECLARE @SubStmt nvarchar(max) = ' + CHAR(39) + 'SELECT + ' + @ColListNonC + char(39) + ' + @SubCol + ' + CHAR(39) + ' FROM #TTest1 WHERE COALESCE( ' + CHAR(39) + ' + @SubCol + '+ CHAR(39) + ') IS NOT NULL' + CHAR(39) + ';
EXEC sp_executesql @SubStmt;'
EXEC sp_executesql @stmt;
END
GO
EXEC chkTableColumns4Chars 'dbo.Test'
如您所說,如果表中有很多列,那么編寫sql查詢來檢查每一列將是一件繁瑣的工作。 為了簡便起見,我們可以通過執行動態sql查詢來做到這一點。
詢問
declare @sql as varchar(max);
select @sql = stuff((
select ', case when [' + [column_name] + '] like '
+ char(39) + '%[^A-Za-z0-9 ]%' + char(39)
+ ' then [' + [column_name] + '] else '
+ char(39) + char(39) + ' end as [' + [column_name] + '] '
from information_schema.columns
where table_name = 'your_table_name'
and [column_name] <> 'ID'
for xml path('')
)
, 1, 1, ''
);
select @sql = 'select [ID], ' + @sql + ' from [your_table_name];';
exec(@sql);
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