SQL SERVER / ORACLE 拼接多行記錄欄位為一個字串的方法：

ORACLE：使用WMSYS.WM_CONCAT（注意選取的欄位增加to_char轉換，確保字元編碼正確）

SQL SERVER：使用連線字串方式選取

select @s = @s + ',' + rtrim(ltrim(NAME)) from tableA;

select substring(@s, 2, len(@s));

declare @sql VARCHAR(MAX), @tracetypes VARCHAR(MAX)
set @sql = 'select WMSYS.WM_CONCAT(to_char(TRACETYPE)) TRACETYPES from ( select TRACETYPE from data.COMMONTRACELOG where ID > 
 
' + CONVERT(VARCHAR(50),@c2) + ' group by TRACETYPE order by count(1) desc ) where rownum <= 10' 
SELECT @tracetypes=TRACETYPES FROM OPENQUERY(clinicdb, 'select WMSYS.WM_CONCAT(to_char(TRACETYPE)) TRACETYPES from ( select TRACETYPE from data.COMMONTRACELOG where ID > ' + CONVERT(VARCHAR(50),@c2) +
 
 ' group by TRACETYPE order by count(1) desc ) where rownum <= 10')

SELECT TRACETYPE, count(1) FROM OPENQUERY(clinicdb,'select * from data.commontracelog c') c WHERE c.ID > @c2 group by TRACETYPE order by count(1) desc

declare @s varchar(max);
set @s=''; 
select @s = @s + ',' + rtrim(ltrim(TRACETYPE)) from
 
 (SELECT TOP 10 TRACETYPE FROM OPENQUERY(clinicdb,'select * from data.commontracelog c') c WHERE c.ID > @c2 group by TRACETYPE order by count(1) desc) t;
select substring(@s, 2, len(@s));