A.A inner join B B.A left join B C.A right join B D. Across join B
A.update table A setcol2=’N’ where col1=1 B.modify table A setcol2=N where col1=1 C.update A set col2=’N’ where col1=1 D.modify A set col2=N where col1=1
A.一對(duì)一 B.一對(duì)多 C.多對(duì)多 D.不確定