insertinto...select...where...join這樣的語法為什么會報錯？例如：insertintoT2(c1,c2,c3)selectt1.c1,t1.c2,t1.c3fromT1t1wheret1.c2='y'leftjoinT3t3ont1.c1=t3.c1leftjoinT4t4ont1.c1=t4.c1;