How can the optimization of Cartesian product in SQL be achieved?

When two tables in SQL are joined without any related conditions, the system performs a Cartesian Product, generating all possible combinations of the tables and leading to decreased performance and resource wastage.

To optimize the Cartesian product operation, the following methods can be implemented:

1. Add join conditions: When performing table joins, it is recommended to add join conditions as much as possible in order to reduce the number of cartesian product combinations and improve query efficiency.
2. Utilize appropriate joining methods such as INNER JOIN, LEFT JOIN, or RIGHT JOIN based on the specific scenario to prevent unnecessary Cartesian product operations.
3. By using subqueries: splitting the Cartesian product operation into multiple subqueries, reducing the size of each subquery’s result set, and improving query efficiency.
4. Using indexes: creating indexes for join fields to speed up queries and reduce the time taken for Cartesian product operations.
5. Limiting the result set size: When querying, try to limit the size of the result set by only returning the necessary data, to avoid unnecessary Cartesian join operations.