UNION operator is a powerful feature that allows you to combine two or more SELECT statements into a single result set. The
UNION operator is used to merge the results of two or more
SELECT statements into a single result set.
The syntax for using the
UNION operator is quite simple. You start with the
SELECT statement that you want to use to create the result set, and then you add the UNION keyword followed by another SELECT statement. You can use as many SELECT statements as you want, as long as they all have the same number of columns and data types.
Here is the basic syntax for using the
UNION operator in SQLite:
SELECT column1, column2, ... columnN FROM table1 UNION SELECT column1, column2, ... columnN FROM table2;
In this syntax, the
UNION operator is used to combine the results of two
SELECT statements that retrieve data from two different tables. The columns specified in both SELECT statements should be identical and in the same order. The result set of the UNION operator will only include unique rows, so duplicates are automatically removed.
You can also use the
UNION operator with other operators like
UNION ALL operator works like the UNION operator but does not remove duplicates. The
INTERSECT operator retrieves only the rows that are common to both SELECT statements, while the
EXCEPT operator retrieves only the rows that are unique to the first SELECT statement.
In conclusion, the SQLite
UNION operator is a powerful tool that allows you to combine the results of two or more SELECT statements into a single result set. By using the
UNION operator, you can create more complex and sophisticated queries that can help you to retrieve and manipulate data more efficiently.