SQLite `INTERSECT`

operator is used to combine the results of two or more `SELECT`

statements by returning only the rows that are common to all of them. In other words, the `INTERSECT`

operator returns the intersection of the result sets produced by each `SELECT`

statement.

## Syntax

The syntax for using the INTERSECT operator is as follows:

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

In this syntax, the columns selected in each `SELECT`

statement must match in number and data type. Also, the tables involved in the `SELECT`

statements must have the same number of columns, and the columns must be in the same order.

The `INTERSECT`

operator works by comparing the result sets produced by each `SELECT`

statement and returning only the rows that exist in all of them. This means that the result set produced by the `INTERSECT`

operator will have the same number of columns as the SELECT statements, and the data in each column will be the same data type as the corresponding columns in the SELECT statements.

It is important to note that the `INTERSECT`

operator only returns distinct rows. This means that if there are duplicate rows in either of the SELECT statements, they will be eliminated from the result set produced by the INTERSECT operator.

In conclusion, the SQLite `INTERSECT`

operator is a powerful tool that allows developers to combine the results of multiple SELECT statements and retrieve only the rows that are common to all of them. This can be particularly useful in scenarios where you need to find the intersection of two or more data sets.