資料庫查詢錯誤，條件是 select main.chinesef, COALESCE( rcuvs.chap) as chap,COALESCE( rcuvs.sec) as sec,COALESCE( rcuvs.id) as id,main.engs,rcuvs.txt from rcuvs,main where main.engs=COALESCE( rcuvs.engs) and main.chineses='可' and COALESCE( rcuvs.chap)=8 and COALESCE( rcuvs.sec)=31—9 order by rcuvs.id !