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SQL Basic Concepts SQL Server

Intersection command in SQL Server

Byvivekjohari

Aug 11, 2014 #SQL Functions
This function is used to returns distinct values that are returned by both the query on the left and right sides of the INTERSECT operand. For intersection command, below basic rules must be followed.
  1. The number and the order of the columns must be the same in all queries.
  2. The data types must be compatible.
 Syntax:-

{ query_specification }
 INTERSECT
{ query_specification }

In this article, we are going to use the following table for the examples:-

CREATE TABLE [dbo]. [Employee](
[Empid] [Int] IDENTITY (1, 1) NOT NULL Primary key,
[EmpNumber] [nvarchar](50) NOT NULL,
[EmpFirstName] [nvarchar](150) NOT NULL,
[EmpLAStName] [nvarchar](150) NULL,
[EmpEmail] [nvarchar](150) NULL,
[Salary] [int] NULL
)

We insert following data into the above tables:-

Insert Into Employee (EmpNumber,EmpFirstName,EmpLAStName,EmpEmail,salary)
Values(‘A001′,’Vivek’,’Johari’,’samir@abcmail.com’,200000)

Insert Into Employee (EmpNumber,EmpFirstName,EmpLAStName,EmpEmail,salary)
Values(‘A002′,’Amit’,’Kumar’,’amit@abcmail.com’,100000)

Insert Into Employee (EmpNumber,EmpFirstName,EmpLAStName,EmpEmail,salary)
Values(‘A003′,’Neha’,’Sharma’,’neha@abcmail.com’,300000)

Insert Into Employee (EmpNumber,EmpFirstName,EmpLAStName,EmpEmail,salary)
Values(‘A004′,’Chandra’,’Singh’,’vivek@abcmail.com’,320000)

Insert Into Employee (EmpNumber,EmpFirstName,EmpLAStName,EmpEmail,salary)
Values(‘A005′,’Avinash’, ‘Dubey’,’avinash@abcmail.com’,250000)

Example

If we execute the below queries individually, we get the following result:-

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Select Empnumber from employee where salary>200000


Result

A003
A004
A005

Select Empnumber from employee where salary between 100000 and 320000

Result

A001
A002
A003
A004
A005


Now if we use Intersection command between these queries, we get the following result.

Select Empnumber from employee where salary>200000
 INTERSECT
Select Empnumber from employee where salary between 100000 and 320000
Result

A003
A004
A005

Above example shows that the Intersection command will return only those distinct records which are return by both the queries(left side query as well as right side query).

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By vivekjohari

I am currently working as a Senior Database Professional and have around 18 years of experience in database. Degree:- Master Degree in Computer(MCA) Certification course in Data Science & Machine Learning from Indian Institute of Technology (IIT), Delhi Work experience:- Designing of the database. Database Optimization. Writing Complex Stored Procedures,Functions,Triggers etc. Designing and developing SSIS & DTS packages. Designing SQL Reports using SSRS. Database Server Maintenance. Certification:- MCTS: DA-100: Analysing Data with Microsoft Power BI MCTS: DP-300: Administering Relational Databases on Microsoft Azure Microsoft certified Sql DBA in Sql server 2008 (MCTS). Microsoft certified BI professional in Sql server 2008 (MCTS). Oracle certified profession DBA in ORACLE 10g (OCP) certified profession DBA in ORACLE 9i (OCP) My other publication Technical Blog:- Technologies with Vivek Johari Guest Author and Blogger at sqlservercentral.com

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