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SQL INTERSECT

SQL intersect operator is used to combine two or more SELECT statements, but it only displays the data similar to the SELECT statement.

The syntax for the INTERSECT operation:

SELECT COLUMN_NAME1, COLUMN_NAME2, COLUMN_NAME3 FROM TABLE_NAME1 INTERSECT SELECT COLUMN_NAME1, COLUMN_NAME2, COLUMN_NAME3 FROM TABLE_NAME2;

Rules to be followed using INTERSECT operator are as follows:

  1. The number of Columns and Order of Columns must be same.
  2. Data Type must be Compatible.

Let's understand the concept of SQL INTERSECT with the help of examples.

Consider the following tables along with the given records.

Table 1: Student

STUDENT_IDSTUDENT_NAMEPHYSICS_MARKSCHEMISTRY_MARKSMATHS_MARKSTOTAL_MARKS
1NEHA8588100273
2VISHAL709082242
3SAMKEET758896259
4NIKHIL607580215
5YOGESH566578199
6ANKITA958596276
7SONAM9889100287
8VINEET8590100275
9SANKET867865229
10PRACHI908075245
101SNEHA8588100273
103VISHAL758896259

Table 2: Stud

STUDENT_IDSTUDENT_NAMEPHYSICS_MARKSCHEMISTRY_MARKSMATHS_MARKSTOTAL_MARKS
4NIKHIL607580215
6ANKITA958596276
7SONAM9889100287
9SANKET867865229
101SNEHA8588100273
102SAMKEET709082242
103VISHAL758896259
105YOGESHWARI566578199
106VINAY8590100275
107PRASHAKA908075245
8VINEET8590100275

Example 1: Execute a query to perform INTERSECT operation between Student table and Stud table.

SELECT * FROM STUDENT INTERSECT SELECT * FROM STUD;

In the above query, we have used two SELECT queries. The First SELECT query fetches the data from the Student table. It performs INTERSECT operation with the data fetched by the Second SELECT query that retrieves the data from the Stud table. Only similar records between these two tables are selected.

The output from the above query is:

STUDENT_IDSTUDENT_NAMEPHYSICS_MARKSCHEMISTRY_MARKSMATHS_MARKSTOTAL_MARKS
4NIKHIL607580215
6ANKITA958596276
7SONAM9889100287
8VINEET8590100275
9SANKET867865229
101SNEHA8588100273
103VISHAL758896259
SQL INTERSECT

Only common records between the Student Table and the Stud tables are displayed.

Example 2: Execute a query to perform INTERSECT operation between Student table and Stud table but display only those Student records from the Stud table where maths marks are equal to 100.

SELECT * FROM STUDENT INTERSECT SELECT * FROM STUD WHERE MATHS_MARKS = 100;

The output from the above query is:

STUDENT_IDSTUDENT_NAMEPHYSICS_MARKSCHEMISTRY_MARKSMATHS_MARKSTOTAL_MARKS
7SONAM9889100287
8VINEET8590100275
101SNEHA8588100273
SQL INTERSECT

Only those students' records are displayed whose math marks are equal to 100 from the Stud table and are common between both the Student and the Stud table.

Example 3: Execute a query to perform INTERSECT operation between Student table and Stud table but display only those Student records from the Student table where chemistry marks are greater than 80.

SELECT * FROM STUDENT WHERE CHEMISTRY_MARKS > 80 INTERSECT SELECT * FROM STUD;

The output from the above query is:

STUDENT_IDSTUDENT_NAMEPHYSICS_MARKSCHEMISTRY_MARKSMATHS_MARKSTOTAL_MARKS
6ANKITA958596276
7SONAM9889100287
8VINEET8590100275
101SNEHA8588100273
103VISHAL758896259
SQL INTERSECT

Only those students' records are displayed whose chemistry marks are greater than 80 from the Student Table and are common between both the Student and the Stud table.

Example 4: Execute a query to perform INTERSECT operation between Student table and Stud table and display only those Student records where physics marks are greater than 75 from the Student Table, and second select queries that display only those Student records where maths marks are greater than 90 from the Stud.

SELECT * FROM STUDENT WHERE PHYSICS_MARKS > 75 INTERSECT SELECT * FROM STUD WHERE MATHS_MARKS > 90;

The output from the above query is:

STUDENT_IDSTUDENT_NAMEPHYSICS_MARKSCHEMISTRY_MARKSMATHS_MARKSTOTAL_MARKS
6ANKITA958596276
7SONAM9889100287
8VINEET8590100275
101SNEHA8588100273
SQL INTERSECT

Only those students' records are displayed whose physics marks are greater than 75 from the Student Table, and math marks are greater than 90 from the Stud Table and are common between both the Student and the Stud table.



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