题目内容

当通过添加用户界面添加一个新的用户时,需要首先通过()命令操纵数据库,来进行重复性检测。

A. INSERT
B. SELECT
C. DELETE
D. UPDATE

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更多问题

A. userName.equals("")
B. userName==" "
C. userName==""
D. userName==null

A. FlowLayout
BorderLayout
C. GridLayout
D. CardLayou

ALTRE 8
B. UPDATE
C. SELECT
DELETE

A. select * from user;
B. select username,password from user;
C. select * from user order username;
D. select * from user where username="admin";