A. select * from 表名 order by 列名1 and order by 列名2 B. select * from 表名 order by 列名1,列名2 C. select * from 表名 where 列1=值1 and 列2=值2 D. select * from 表名 where 列1=值1 and 列1=值2
A. remove B. delete C. truncate D. update
A. if B. if else C. if else if D. switch
A. case B. meet C. convert D. upper
A. create B. drop C. alter D. select