Which of the following queries contains an error?

1. Select * from emp where empid = 10003;
2. Select empid from emp where empid = 10006;
3. Select empid from emp;
4. Select empid where empid = 1009 and lastname = 'GUPTA';

Consider the following table namely Employee :

Employee_id	Name	Salary
1001	Misha	6000
1009	Khushi	4500
1018	Japneet	7000

Which of the names will not be displayed by the below given query ?

SELECT name FROM employee WHERE employee_id > 1009 ;

1. Misha, Khushi
2. Khushi, Japneet
3. Japneet
4. Misha, Japneet

Consider the following query

SELECT name FROM class WHERE subject LIKE ' ............... Computer Science' ;

Which operator tests a column for the absence of data (i.e., NULL value) ?

1. EXISTS operator
2. NOT operator
3. IS operator
4. None of these