聯合查詢語句

sql=""
sql=sql & "select ID,Feed_Title,Feed_Type,Feed_Date,'A' as FromTbl FROM xinxi where user_name='"&username&"' ORDER BY Feed_Date DESC union "
sql=sql &"select ID,Feed_Title,Feed_Type,Feed_Date,'B' as FromTbl FROM tech where (Feed_Title like '%"&username&"%') union "
sql=sql &"select ID,Feed_Title,Feed_Type,Feed_Date,'C' as FromTbl FROM jisu where (Feed_Title like '%"&username&"%') ORDER BY Feed_Date DESC"