Tutorialsteacher

Follow Us

Articles
  • C#
  • C# OOP
  • ASP.NET Core
  • ASP.NET MVC
  • LINQ
  • Inversion of Control (IoC)
  • Web API
  • JavaScript
  • TypeScript
  • jQuery
  • Angular 11
  • Node.js
  • D3.js
  • Sass
  • Python
  • Go lang
  • HTTPS (SSL)
  • Regex
  • SQL
  • SQL Server
  • PostgreSQL
  • MongoDB
  • SQL - Getting Started
  • What is SQL
  • Create Table
  • ALTER TABLE Statements
  • Rename Columns
  • Modify Column Type
  • Drop Columns
  • Rename Tables
  • Drop Tables
  • Insert Statement
  • Update Statement
  • Delete Statement
  • Truncate Statement
  • Merge Statement
  • Null Value
  • Select Query
  • WHERE Clause
  • GROUP BY Clause
  • HAVING Clause
  • ORDER BY Clause
  • SQL - Inner Join
  • SQL - Left Join
  • SQL - Right Join
  • SQL - Full Join
  • SQL - BETWEEN
  • SQL - IN
  • SQL - LIKE
  • SQL - INTERSECT
  • SQL - MINUS
  • SQL - UNION
  • SQL - UNION ALL
  • SQL - DISTINCT
  • SQL - ANY, SOME
  • SQL - ALL
  • SQL - AVG()
  • SQL - COUNT()
  • SQL - MAX()
  • SQL - MIN()
  • SQL - SUM()
Entity Framework Extensions - Boost EF Core 9
  Bulk Insert
  Bulk Delete
  Bulk Update
  Bulk Merge

SQL - Intersect Operator

The INTERSECT operator returns common result set of two or more SELECT queries. It returns all common records that are exist in the result set of all INTERSECT sub-queries.

Syntax:

SELECT column_name1, column_name2,... FROM tables [WHERE Condition] INTERSECT SELECT column_name1, column_name2, ... FROM tables [WHERE Condition];

For the demo purpose, we will use the following tables in all examples.

Employee Table
EmpIdFirstNameLastNameEmailSalaryHireDate
1'John''King''[email protected]'330002018-07-25
2'James''Bond'2018-07-29
3'Neena''Kochhar''[email protected]'170002018-08-22
4'Lex''De Haan''[email protected]'150002018-09-8
5'Amit''Patel'180002019-01-25
6'Abdul''Kalam''[email protected]'250002020-07-14
Employee_backup
EmpIdFirstNameLastNameEmailSalaryHireDate
1'John''King''[email protected]'330002018-07-25
2'James''Bond'2018-07-29
3'Neena''Kochhar''[email protected]'170002018-08-22
6'Abdul''K''[email protected]'250002020-07-14
7'Swati''Karia''[email protected]'220002020-09-18

Consider the following query with the INTERSECT operator.

SQL Script: INTERSECT Operator
SELECT * FROM Employee INTERSECT SELECT * from Employee_backup

Above query will return the common records in both the tables, as shown below.

EmpIdFirstNameLastNameEmailSalaryHireDate
1'John''King''[email protected]'330002018-07-25
2'James''Bond'2018-07-29
3'Neena''Kochhar''[email protected]'170002018-08-22

Notice that the above result does not include 'Abdul' because the LastName values are different.

Note that both the queries must have equal number of expressions in their SELECT clause. The following query will raise an error.

SQL Script: Error with INTERSECT
SELECT * FROM Employee INTERSECT SELECT EmpId, FirstName from Employee_backup

You can use the WHERE clause with any or all intersect queries, as shown below.

SQL Script: INTERSECT Query
SELECT * FROM Employee WHERE Salary > 15000 INTERSECT SELECT * from Employee_backup
EmpIdFirstNameLastNameEmailSalaryHireDate
1'John''King''[email protected]'330002018-07-25
3'Neena''Kochhar''[email protected]'170002018-08-22
TUTORIALSTEACHER.COM

TutorialsTeacher.com is your authoritative source for comprehensive technologies tutorials, tailored to guide you through mastering various web and other technologies through a step-by-step approach.

Our content helps you to learn technologies easily and quickly for learners of all levels. By accessing this platform, you acknowledge that you have reviewed and consented to abide by our Terms of Use and Privacy Policy, designed to safeguard your experience and privacy rights.

[email protected]

ABOUT USTERMS OF USEPRIVACY POLICY
copywrite-symbol

2024 TutorialsTeacher.com. (v 1.2) All Rights Reserved.