1This constraint uniquely identify each row in a table.

2. Which of the following will be the output after executing this statement:

SELECT LENGTH(ITDB202) FROM dual;

3. Which of the following will be the output after executing this statement:

SELECT CONCAT(Query, Language) FROM dual;

4.

Examine the EMPLOYEES table and the given SQL statement:

EID	Name	Dept	Salary
1001	Rashad	IT	700
1002	Salma	Admin	500
1003	Ahmed	IT

SELECT Name, Dept, Salary

FROM employees

WHERE name LIKE %d AND salary IS NULL;

Which of the following will be the output after executing the statement?

5.Which operator can be used with a multiple row subquery?