Which of the following SQL keywords is used to perform a Cartesian product in SQL?
Question
Which of the following SQL keywords is used to perform a Cartesian product in SQL?
Solution
The SQL keyword used to perform a Cartesian product is the CROSS JOIN.
In SQL, a Cartesian product results from combining every row of one table with every row of another table. This operation creates a new result set that contains all possible combinations of the two tables. The CROSS JOIN
keyword effectively implements this operation.
For example, if you have two tables, TableA
and TableB
, the SQL statement for a Cartesian product would look like this:
SELECT * FROM TableA CROSS JOIN TableB;
This will return a result set consisting of every row from TableA
combined with every row from TableB
. It's important to use CROSS JOIN
judiciously, as it can lead to very large result sets, especially with large tables.
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