SQL Server查询条件IN中能否使用变量的示例详解

IF EXISTS (SELECT 1 FROM sys.objects WHERE name='TEST' AND type='U')
BEGIN
 DROP TABLE TEST;
END
GO
CREATE TABLE TEST ( ID INT, NAME VARCHAR(16) );
GO
 
INSERT INTO dbo.TEST
SELECT 1, 'a' UNION ALL
SELECT 2, 'b' UNION ALL
SELECT 3, 'c' UNION ALL
SELECT 4, 'a,b'UNION ALL
SELECT 5, '''b'',''c''' UNION ALL
SELECT 6, '''b';
GO

DECLARE @name VARCHAR(16);
SET @name='a';
 
SELECT * FROM TEST WHERE name IN (@name);
GO
 
DECLARE @name VARCHAR(16);
SET @name='a,b';
 
SELECT * FROM TEST WHERE name IN (@name);
GO

DECLARE @name1 VARCHAR(16);
DECLARE @name2 VARCHAR(16);
SET @name1='b|c';
SET @name2=REPLACE(@name1,'|',''',''')
SELECT @name2
 
SELECT * FROM TEST WHERE name IN (('''' + @name2 + ''''));

DECLARE @name1 VARCHAR(16);
DECLARE @name2 VARCHAR(16);
SET @name1='b|c';
SET @name2='''' + REPLACE(@name1,'|',''',''') +''''
SELECT @name2
 
SELECT * FROM TEST WHERE name IN (@name2 );

DECLARE @sql_cmd NVARCHAR(max);
DECLARE @name VARCHAR(16);
 
SET @name='b|c';
SET @sql_cmd='SELECT * FROM TEST WHERE name IN (''' + REPLACE(@name,'|',''',''') +''');'
 
EXEC sp_executesql @sql_cmd;

DECLARE @name VARCHAR(16);
 
SET @name='b|c';
SELECT *FROM test WHERE name IN (SELECT value FROM STRING_SPLIT(@name, '|'))

DECLARE @name VARCHAR(16);
DECLARE @xml_para XML;
 
SET @name = 'b|c';
SET @xml_para = CAST(( '<A>' + REPLACE(@name, '|', '</A><A>') + '</A>' ) AS XML);
 
 
SELECT *
FROM dbo.TEST
WHERE NAME IN ( SELECT A.value('.', 'varchar(max)') AS [Column]
     FROM  @xml_para.nodes('A') AS FN ( A ) );