You can find me on FacebookTwitter and Google Plus. Or here's the SQL: This is more than enough to answer the SQL interview question, the print nth highest salary of an employee in the Oracle. Once you know the generic logic to solve this problem, you can tackle all those variations by yourself.
Once you know the generic logic to solve this problem, you can tackle all those variations by yourself. This example shows that just following some simple SQL best practices can seriously improve the queries you write.
Can you write SQL query to list all Departments along with the total salary there? If there is no second highest salary, then the query should return NULL. You can find the nth highest salary in MySQL without using subquery as shown below: Write an SQL query to list Departments that have less than 3 people in it?
This improves the readability of SQL queries by clearing highlight which ones are keywords and which ones are object names even if syntax highlight is not available.
Performance analysis As we learned above that inner query executes every time, one row of outer query is processed, this brings a lot of performance overhead, specially if the number of rows are too big. Since many Programmers only know the easy way to solve this problem e.
In fact, there are several ways to find second highest salary and you must know couple of them e. If you able to find solution of all above SQL queries in quick time and feeling bore again, checkout my post about Top 20 SQL queries from Interviews for some more fun. Once you solve the problem, Interviewer will most likely increase the difficulty level by either moving to Nth salary direction or taking away this buit-in utilities.
You can write this query in number of ways, but i will explain one of the beset MySQL query which is easy to write and understand. Most of the people learn it character by character, but few understand how this query works.
We will populate this table with id, and and salary of employees. You can print top 10 records by saying TOP Now It's time to apply the knowledge you have learned so far. Lest understand first that the inner query executes every time, a row from outer query is processed.
The outer query will then pick the top most salary, which would be your Nth highest salary. The benefit of this approach is that it's faster than correlated query approach but its vendor dependent. Find second highest salary in Oracle using rank?
It is not handling duplicate salaries properly. If you are looking for second highest salary then your query will stop as soon as inner query will return 2. In order to find the Nth highest salary, we are only considering unique salaries.
The second query simply joins the original salary data to this totals query using DepartmentID as the common field and uses a criteria to show only employees above the average salary for their department: Just use order by clause to sort the result set then print the second salary as shown below: I frequently use this keyword to see the data from a large table, just to understand columns and data inside it.
If there is no second highest salary, then the query should return NULL. I have left the Oracle database for you as an exercise. Correlated and uncorrelated queries. To avoid this, one should use DB specific keywords to get the result faster. This solution uses subquery to first exclude the maximum salary from the data set and then again finds maximum salary, which is effectively the second maximum salary from the Employee table.
This section contains 6 problems for which you need to write SQL queries, the solution is provided in the next section but I suggest you to try to solve these problems first before looking at the solution. Create a new database schema.
All the keyword is on the capital case while table names and column names are in small and camel case. If there is no second highest salary, then the query should return NULL.
If you able to find solution of all above SQL queries in quick time and feeling bore again, checkout my post about Top 20 SQL queries from Interviews for some more fun.
In order to learn fast, start with a small table with few columns which include data types like number, date, and String, has less number of data so that you can quickly understand and expect what should be output.Write a SQL query to get the second highest salary from the table above.
Also write a query to find the nth highest salary in SQL, where n can be any number. The easiest way to start with a problem like this is to ask yourself a simpler question first. WHERE Salary (select MAX (Salary) from Employee) Find Nth Highest Salary We already learnt how to use CTE and CTE examples in Previous update.
here we use the same CTE to get the Nth max salary from a table using Row_Number() function.
Write SQL query to get the nth highest salary among all Employees. How can you find 10 employees with Odd number as Employee ID? Write a SQL Query to get the names of employees whose date of birth is between 01/01/ to 31/12/ Select kaleiseminari.comment,kaleiseminari.com From Employee E1,(Select Department,Max(Salary) as Salary From Employee group by Department) E2 Where kaleiseminari.comment = kaleiseminari.comment And kaleiseminari.comSalary Treat the result of above sql as a table and Now find maximum salary for each department from this.
In this blog we will discuss how to find the highest salary, the second highest salary and N number of the highest salaries with different examples. Step 1 Create table in SQL server and insert some data. this query uses a sub-query to find out the first two highest salaries of employees in employee_table relation (note that the value of limit is 2), now using these two records it finds the minimum of both, which would be the second highest salary.Download