In this article I am giving example of some SQL query which is asked in most the of interviews who is having one or two year experience on this field .whenever you go for java developer position or any other programmer position interviewee expect that if you are working from one or two years on any project definitely you come across to handle this database query, so they test your skill by asking this type of simple query.
Que 1: SQL Query to find second highest salary of Employee
Ans : There are many ways to find second highest salary of Employee in SQL, you can either use SQL Join or Subquery to solve this problem. Here is SQL query using Subquery :
select MAX(Salary) from Employee WHERE Salary NOT IN (select MAX(Salary) from Employee );
Que 2: SQL Query to find Max Salary from each department.
SELECT DeptID, MAX(Salary) FROM Employee GROUP BY DeptID.
Que 3: Write SQL Query to display current date.
Ans: SQL has built in function called GetDate() which returns current timestamp.
Que 4: Write an SQL Query to check whether date passed to Query is date of given format or not.
Ans: SQL has IsDate() function which is used to check passed value is date or not of specified format ,it returns 1(true) or 0(false) accordingly.
SELECT ISDATE('1/08/13') AS "MM/DD/YY";
It will return 0 because passed date is not in correct format.
Que 5: Write a SQL Query to print the name of distinct employee whose DOB is between 01/02/2012 to 31/12/2013.
SELECT DISTINCT EmpName FROM Employees WHERE DOB BETWEEN ‘01/02/2012’ AND ‘31/12/2013’;
Que 6:Write an SQL Query find number of employees according to gender whose DOB is between 01/01/1960 to 31/12/1975.
Ans : SELECT COUNT(*), sex from Employees WHERE DOB BETWEEN ‘01/01/1960 ' AND ‘31/12/1975’ GROUP BY sex;
Que 7:Write an SQL Query to find employee whose Salary is equal or greater than 20000.
Ans : SELECT EmpName FROM Employees WHERE Salary>=20000;
Que 8:Write an SQL Query to find name of employee whose name Start with ‘S’
Ans: SELECT * FROM Employees WHERE EmpName like 'S%';
Que 9: find all Employee records containing the word "John", regardless of whether it was stored as JOHN, John, or john.
Ans : SELECT * from Employees WHERE upper(EmpName) like upper('john%');
Que 10: Write a SQL Query to find year from date.
Ans : SELECT YEAR(GETDATE()) as "Year";