sqlserver字符串多行合並為一行

--創建測試表
IF OBJECT_ID('test') IS NOT NULL
    DROP TABLE test
CREATE TABLE dbo.test(
    id int IDENTITY(1,1) NOT NULL,
    name varchar(50) NULL,
    subject varchar(50) NULL,
    source decimal(18,2) NULL
)
GO

--插入測試數據
INSERT INTO test (name,subject,source) 
    SELECT '張三','語文',60  UNION ALL
    SELECT '張三','英語',90  UNION ALL
    SELECT '李四','語文',70  UNION ALL
    SELECT '李四','數學',80  UNION ALL
    SELECT '王五','數學',75  UNION ALL
    SELECT '王五','英語',80
GO

SELECT * FROM test

--1 通過 select 累加
DECLARE @sql_col VARCHAR(8000)
SELECT @sql_col = ISNULL(@sql_col + ',','') + QUOTENAME(Subject) FROM test 
GROUP BY Subject

SELECT @sql_col

--2 通過 FOR xml path('') 合並字符串記錄
SELECT 
    STUFF(
        (SELECT '#' + Subject
         FROM test
         WHERE name = '王五'
         FOR xml path('')
        ),1,1,''
        )
  
--3 分組合並字符串記錄
SELECT
    name,
    Subject = (
               STUFF(
                    (SELECT '#' + Subject
                     FROM test
                     WHERE name = A.name
                     FOR xml path('')
                    ),1,1,''
                    )
                 )
FROM test A
GROUP by name