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Intersect - (MySQL Misc)

In MySQL, the INTERSECT operator is used to combine the results of two or more SELECT statements and return only the common rows between them. In this tutorial, we'll explain the syntax and usage of the INTERSECT operator in MySQL.

Syntax

The syntax for using the INTERSECT operator in MySQL is as follows:

SELECT column1, column2, ...
FROM table1
INTERSECT
SELECT column1, column2, ...
FROM table2;

Example

Let's take an example of two tables, "users1" and "users2", and we want to find the common rows between them. Here's how we can do it using the INTERSECT operator:

SELECT *
FROM users1
INTERSECT
SELECT *
FROM users2;

Output

When we run the above example query, it will return only the rows that are common between the "users1" and "users2" tables.

Explanation

The INTERSECT operator is used to combine the results of two or more SELECT statements and return only the common rows between them. In the above example, we used the INTERSECT operator to return the rows that are common between the "users1" and "users2" tables.

Use

The INTERSECT operator is useful when you need to find the common rows between two or more tables. You can use it to narrow down your search results and filter out the unnecessary data.

Important Points

  • The INTERSECT operator is not supported in MySQL by default.
  • You can emulate the functionality of the INTERSECT operator by using the INNER JOIN clause.
  • The number and types of columns in both SELECT statements must be the same when using the INTERSECT operator.

Summary

In this tutorial, we discussed the syntax and usage of the INTERSECT operator in MySQL. We learned that the INTERSECT operator is used to combine the results of two or more SELECT statements and return only the common rows between them. We also learned that it's not supported in MySQL by default and how to emulate its functionality using INNER JOIN.

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