Intersect
Similar to the UNION command, INTERSECT also operates on two SQL statements. The difference is that, while UNION essentially acts as an OR operator (value is selected if it appears in either the first or the second statement), the INTERSECT command acts as an AND operator (value is selected only if it appears in both statements).
The syntax is as follows:
[SQL Statement 1]
INTERSECT
[SQL Statement 2]
Let’s assume that we have the following two tables,
Table Store_Information
| store_name | Sales | Date |
| Los Angeles | $1500 | Jan-05-1999 |
| San Diego | $250 | Jan-07-1999 |
| Los Angeles | $300 | Jan-08-1999 |
| Boston | $700 | Jan-08-1999 |
Table Internet_Sales
| Date | Sales |
| Jan-07-1999 | $250 |
| Jan-10-1999 | $535 |
| Jan-11-1999 | $320 |
| Jan-12-1999 | $750 |
and we want to find out all the dates where there are both store sales and internet sales. To do so, we use the following SQL statement:
SELECT Date FROM Store_Information
INTERSECT
SELECT Date FROM Internet_Sales
Result:
| Date |
| Jan-07-1999 |
Please note that the INTERSECT command will only return distinct values.