A.select col1,col2,col3 from T1 into T2(col1,col2,col3) B.insert T1 (col1,col,col3) into T2(col1,col2,col3) C.insert into T2 (col1,col2,col3) as select col1,col2,col3 from T1 D.insert into T2(col1,col2,col3) select col1,col2,col3 from T1;
已知表tbl中字段land_ID建有索引,字段cust_id建有唯一索引,下列語句查詢邏輯相同,其中執(zhí)行效率最優(yōu)的是()
A.A B.B C.C D.D