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if request("tpid")<>"" then
Sql="select * from [product] where typeid="&request("tpid")&" order by news_time desc"
else
set rsc=server.CreateObject("adodb.recordset")
sqlc="select id from [class] where resideid="&request("typeid")&" "
rsc.open sqlc,conn
sql="select * from news where typeid in ("&rsc("id")&") order by news_time desc"
end if
'或者最后一句直接写成
sql="select * from news where typeid in (select id from [class] where resideid="&request("typeid")& ") order by news_time desc"
'这样也不行啊