在SQL Server vNext中，这将内置STRING_AGG函数。在STRING_AGG（Transact-SQL）中了解有关它的更多信息。

首先，您应该声明一个表变量并用表数据填充它，然后，使用WHILE循环，逐个选择行并将其值添加到nvarchar（max）变量中。

    Go
    declare @temp table(
        title nvarchar(50)
    )
    insert into @temp(title)
    select p.Title from dbo.person p
    --
    declare @mainString nvarchar(max)
    set @mainString = '';
    --
    while ((select count(*) from @temp) != 0)
    begin
        declare @itemTitle nvarchar(50)
        set @itemTitle = (select top(1) t.Title from @temp t)
    
        if @mainString = ''
        begin
            set @mainString = @itemTitle
        end
        else
        begin
            set @mainString = concat(@mainString,',',@itemTitle)
        end
    
        delete top(1) from @temp
    
    end
    print @mainString

我真的很喜欢Dana回答的优雅，只想让它变得完整。

DECLARE @names VARCHAR(MAX)
SET @names = ''

SELECT @names = @names + ', ' + Name FROM Names

-- Deleting last two symbols (', ')
SET @sSql = LEFT(@sSql, LEN(@sSql) - 1)

一个现成的解决方案，没有额外的逗号：

select substring(
        (select ', '+Name AS 'data()' from Names for xml path(''))
       ,3, 255) as "MyList"

空列表将导致NULL值。通常，您会将列表插入到表列或程序变量中：根据需要调整最大长度255。

（迪瓦卡尔和延斯·弗兰森提供了很好的答案，但需要改进。）

虽然为时已晚，而且已经有了许多解决方案。下面是MySQL的简单解决方案：

SELECT t1.id,
        GROUP_CONCAT(t1.id) ids
 FROM table t1 JOIN table t2 ON (t1.id = t2.id)
 GROUP BY t1.id

以下是实现这一目标的完整解决方案：

-- Table Creation
CREATE TABLE Tbl
( CustomerCode    VARCHAR(50)
, CustomerName    VARCHAR(50)
, Type VARCHAR(50)
,Items    VARCHAR(50)
)

insert into Tbl
SELECT 'C0001','Thomas','BREAKFAST','Milk'
union SELECT 'C0001','Thomas','BREAKFAST','Bread'
union SELECT 'C0001','Thomas','BREAKFAST','Egg'
union SELECT 'C0001','Thomas','LUNCH','Rice'
union SELECT 'C0001','Thomas','LUNCH','Fish Curry'
union SELECT 'C0001','Thomas','LUNCH','Lessy'
union SELECT 'C0002','JOSEPH','BREAKFAST','Bread'
union SELECT 'C0002','JOSEPH','BREAKFAST','Jam'
union SELECT 'C0002','JOSEPH','BREAKFAST','Tea'
union SELECT 'C0002','JOSEPH','Supper','Tea'
union SELECT 'C0002','JOSEPH','Brunch','Roti'

-- function creation
GO
CREATE  FUNCTION [dbo].[fn_GetItemsByType]
(   
    @CustomerCode VARCHAR(50)
    ,@Type VARCHAR(50)
)
RETURNS @ItemType TABLE  ( Items VARCHAR(5000) )
AS
BEGIN

        INSERT INTO @ItemType(Items)
    SELECT  STUFF((SELECT distinct ',' + [Items]
         FROM Tbl 
         WHERE CustomerCode = @CustomerCode
            AND Type=@Type
            FOR XML PATH(''))
        ,1,1,'') as  Items



    RETURN 
END

GO

-- fianl Query
DECLARE @cols AS NVARCHAR(MAX),
    @query  AS NVARCHAR(MAX)

select @cols = STUFF((SELECT distinct ',' + QUOTENAME(Type) 
                    from Tbl
            FOR XML PATH(''), TYPE
            ).value('.', 'NVARCHAR(MAX)') 
        ,1,1,'')

set @query = 'SELECT CustomerCode,CustomerName,' + @cols + '
             from 
             (
                select  
                    distinct CustomerCode
                    ,CustomerName
                    ,Type
                    ,F.Items
                    FROM Tbl T
                    CROSS APPLY [fn_GetItemsByType] (T.CustomerCode,T.Type) F
            ) x
            pivot 
            (
                max(Items)
                for Type in (' + @cols + ')
            ) p '

execute(@query)