在MYSQL数据库中以下语句错误的是() A: select-sal+1from-emp; B: select-sal*10,sal*deptnofrom-emp; C: select-sal*10,deptno*10-from-emp; D: select-sal*10,deptno*10-TO-emp;
在MYSQL数据库中以下语句错误的是() A: select-sal+1from-emp; B: select-sal*10,sal*deptnofrom-emp; C: select-sal*10,deptno*10-from-emp; D: select-sal*10,deptno*10-TO-emp;
以下语句正确的是() A: select<br/>sal+1 from emp; B: select<br/>sal*10,sal*deptno from emp; C: 不能使用运算符号 D: select<br/>sal*10,deptno*10 from emp;
以下语句正确的是() A: select<br/>sal+1 from emp; B: select<br/>sal*10,sal*deptno from emp; C: 不能使用运算符号 D: select<br/>sal*10,deptno*10 from emp;
以下语句错误的是( ) A: alter table emp delete column addcolumn; B: alter table emp modify column addcolumn char(10); C: alter table emp change addcolumn addcolumn int; D: alter table emp add column addcolumn int;
以下语句错误的是( ) A: alter table emp delete column addcolumn; B: alter table emp modify column addcolumn char(10); C: alter table emp change addcolumn addcolumn int; D: alter table emp add column addcolumn int;
有如下类的定义,创建Employee对象错误的是() public class Employee{ private int age; private String name; public Employee(int age){ this.age = age; } public Employee(String name){ this.name = name; } public Employee(int age,String name){ this(age); this.name = name; } } A: Employee emp = new Employee(10); B: Employee emp = new Employee("Tom"); C: Employee emp = new Employee(); D: Employee emp = new Employee(10,"Tom");
有如下类的定义,创建Employee对象错误的是() public class Employee{ private int age; private String name; public Employee(int age){ this.age = age; } public Employee(String name){ this.name = name; } public Employee(int age,String name){ this(age); this.name = name; } } A: Employee emp = new Employee(10); B: Employee emp = new Employee("Tom"); C: Employee emp = new Employee(); D: Employee emp = new Employee(10,"Tom");
以下能删除表的语句是( ) A: Delete * from emp B: Drop database emp C: Drop * from emp D: delete database emp
以下能删除表的语句是( ) A: Delete * from emp B: Drop database emp C: Drop * from emp D: delete database emp
EMP途径
EMP途径
分析下面的JavaScript代码段,输出的结果是()。 var emp=new Array(5); emp[1]=1; emp[5]=2; document.write(emp.length);
分析下面的JavaScript代码段,输出的结果是()。 var emp=new Array(5); emp[1]=1; emp[5]=2; document.write(emp.length);
查询员工表emp中的第3条到第8条记录。显示emp表中的全部字段。( ) A: select rownum rn,emp.* from emp where rownum3; B: select * from(select rownum RN,emp.* from emp where RN3; C: select * from(select rownum RN,emp.* from emp where rownum3; D: select rownum RN,emp.* from emp where RN3;
查询员工表emp中的第3条到第8条记录。显示emp表中的全部字段。( ) A: select rownum rn,emp.* from emp where rownum3; B: select * from(select rownum RN,emp.* from emp where RN3; C: select * from(select rownum RN,emp.* from emp where rownum3; D: select rownum RN,emp.* from emp where RN3;
下面删除记录的语句正确的是( ) A: delete from emp where name="Tony"; B: delete * from emp where name="Tony"; C: drop from emp where name="Tony"; D: drop * from emp where name="Tony";
下面删除记录的语句正确的是( ) A: delete from emp where name="Tony"; B: delete * from emp where name="Tony"; C: drop from emp where name="Tony"; D: drop * from emp where name="Tony";
名词解释: EMP途径:
名词解释: EMP途径: