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2Nd Highest Salary Inwards Oracle Using Row_Number In Addition To Grade Inwards Oracle In Addition To Mssql

This is the minute article close calculating 2nd highest salary inward SQL. In the first part, you lot convey learned how to honor the minute highest salary inward MySQL, SQL SERVER together with past times using ANSI SQL, which should too piece of work inward all database which confirms ANSI touchstone e.g. PostgreSQL, SQLLite etc. In this part, I volition demo you lot how to honor the 2nd maximum salary inward Oracle together with SQL SERVER using ROW_NUMBER(), RANK() together with DENSE_RANK() method. These are window business office inward Oracle, which tin endure used to assign unique row id, or grade to each row based on whatever column together with hence select the right row. For example, to calculate the 2nd highest salary, nosotros tin exercise row numbers using ROW_NUMBER() business office over salary together with hence acquire the minute row, which would endure your 2nd maximum salary. Though these ranking functions handles duplicates differently, hence depending upon whether your tabular array has the duplicate salary, you lot demand to select either ROW_NUMBER(), RANK() or DENSE_RANK(), which grip duplicate differently. This is too 1 of the most frequently asked SQL Interview questions for your reference.



SQL to laid upwards Schema inward Oracle database

Here are the SQL queries to exercise tables for this problem. It kickoff exercise an Employee tabular array together with hence insert unopen to dummy information amongst duplicate salaries.

CREATE TABLE Employee (name varchar(10), salary int);  INSERT INTO Employee VALUES ('Mr. X', 3000); INSERT INTO Employee VALUES ('Mr. Y', 4000); INSERT INTO Employee VALUES ('Mr. A', 3000); INSERT INTO Employee VALUES ('Mr. B', 5000); INSERT INTO Employee VALUES ('Mr. C', 7000); INSERT INTO Employee VALUES ('Mr. D', 1000);

2nd highest salary inward Oracle using ROW_NUMBER

Here is the SQL query to honor the minute highest salary inward Oracle using row_number() function:

select * from ( select e.*, row_number() over (order by salary desc) as row_num from Employee e ) where row_num = 2;  Output: NAME    SALARY  ROW_NUM Mr. B    5000     2

The work amongst this approach is that if you lot convey duplicate rows (salaries) hence 2nd together with third maximum both volition endure same.

2nd maximum salary inward Oracle using RANK

select * from ( select e.*, rank() over (order by salary desc) as grade from Employee e ) where grade = 2;  Output: Mr. B 5000 2

If you lot utilisation RANK hence same salaries volition convey the same rank, which agency 2nd maximum volition ever endure same but at that spot won't endure whatever third maximum. There volition endure fourth maximum.

2nd highest salary inward Oracle using DENSE_RANK

select * from ( select e.*, dense_rank() over (order by salary desc) as dense_rank from Employee e ) where dense_rank = 2;  Output NAME   SALARY  ROW_NUM Mr. B   5000     2

DENSE_RANK is only perfect. It volition ever provide right highest salary fifty-fifty amongst duplicates. For example, if the 2nd highest salary has appeared multiple times they would convey the same rank. So the minute maximum volition ever endure same. The side past times side dissimilar salary volition endure third maximum every bit opposed to fourth maximum every bit was the instance amongst RANK() function. Please see, Microsoft SQL Server 2012 T-SQL Fundamentals to larn to a greater extent than close the divergence betwixt rank() together with desnse_rank() business office inward SQL Server.

Nth Highest salary amongst duplicates
In this instance fourth highest salary is duplicate, hence if you lot utilisation row_number() fourth together with fifth highest salary volition endure same if you lot utilisation rank() hence at that spot won't endure whatever fifth highest salary.

fourth highest salary using row_number() inward Oracle:

select * from ( select e.*, row_number() over (order by salary desc) as row_num from Employee e ) where row_num = 4;  NAME    SALARY  ROW_NUM Mr. X    3000     4

fifth maximum salary using row_number() inward Oracle 11g R2 database:

select * from ( select e.*, row_number() over (order by salary desc) as row_num from Employee e ) where row_num = 5;  NAME    SALARY  ROW_NUM Mr. Influenza A virus subtype H5N1    3000    5

You tin encounter both times it returns solely 3000, fifth maximum should endure 1000.

If you lot calculate fifth maximum using RANK() hence you lot won't acquire anything:

select * from ( select e.*, rank() over (order by salary desc) as grade from Employee e ) where grade = 5;  Output:  Record Count: 0;

but DENSE_RANK() volition provide both fourth together with fifth highest salary correctly every bit 3000 together with 1000.

select distinct salary from ( select e.*, dense_rank() over (order by salary desc) as dense_rank from Employee e ) where dense_rank = 4;  Output SALARY 3000

together with the fifth maximum would be:

select distinct salary from ( select e.*, dense_rank() over (order by salary desc) as dense_rank from Employee e ) where dense_rank = 5;  Output: SALARY 1000

That's all close how to calculate minute highest salary inward Oracle using ROWNUM, RANK() together with DENSE_RANK() function.

Here is a overnice summary of divergence betwixt RANK, ROW_NUMBER together with DENSE_RANK business office for your quick reference:

Some to a greater extent than SQL query interview questions together with articles:

• What is the divergence betwixt truncate together with delete inward SQL (answer)
• What is the divergence betwixt UNION together with UNION ALL inward SQL? (answer)
• What is the divergence betwixt WHERE together with HAVING clause inward SQL? (answer)
• What is the divergence betwixt Correlated together with Non-Correlated subquery inward SQL? (answer)
• 5 Web sites to larn SQL online for FREE (resource)
• Write SQL queries to honor all duplicate records from the table? (query)
• How to bring together 3 tables inward 1 SQL query? (solution)

Further Learning
Introduction to SQL
The Complete SQL Bootcamp
SQL for Newbs: Data Analysis for Beginners

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