【单选题】以下哪个SQL语句是正确的:
B.
create table (Code int primary key);
D.
select Code as ‘代号’ from users;
【单选题】Users with IAD often find it difficult to get along in their work.
【简答题】They are often shared by many users connected to the computer.
【判断题】公路运输主要承担短途运输和无铁路可通的长途货物的运输任务。
【简答题】通常所说三视图是指主视图 、____、侧视图。
【判断题】在一间19平方米的室内进行紫外线消毒需要30W紫外线灯管3个。()
【判断题】Email users often spend time putting out fires.
【单选题】以下哪个 SQL 语句是正确的( )
A.
insert into users (‘p001’,’ 张三 ’,’ 男 ’);
B.
create table (Code int primary key);
C.
update users Code=’p002’ where Code=’p001’;
D.
select Code as ‘ 代号 ’ from users ;