Souy Soeng

MySQL EXISTS The EXISTS operator in MySQL is used to test for the existence of rows in a subquery. It returns TRUE if the subquery returns one or m…

An Essential Guide to MySQL Derived Table A derived table in MySQL is a subquery that is used in the FROM clause of a query. It acts as a temporary…

MySQL Subquery A subquery in MySQL is a query nested inside another query. Subqueries allow you to perform operations where the result of one query …

MySQL ROLLUP The ROLLUP operator in MySQL is used with the GROUP BY clause to generate subtotals and grand totals for grouped data. It provides a c…

MySQL HAVING Clause The HAVING clause in MySQL is used to filter the results of a GROUP BY operation based on aggregate function conditions. It is …

MySQL Self Join A Self Join is a regular join where a table is joined with itself. It is used when there is a need to compare rows within the same t…

MySQL CROSS JOIN The CROSS JOIN clause in MySQL generates a Cartesian product of two tables. It combines every row from the first table with every r…

MySQL RIGHT JOIN The RIGHT JOIN clause in MySQL retrieves all rows from the right table and the matching rows from the left table. If no match is fo…

MySQL LEFT JOIN The LEFT JOIN clause in MySQL retrieves all rows from the left table and the matching rows from the right table. If no match is foun…