MySQL table primary keys and unique indexes prevent multiple rows with the same index from being added to the table. If you try to insert a duplicate row with a ...

Sometimes we need to check how many duplicate values a column has in MySQL table. We can do this by using "group by" and "having". Example: Suppose you have a table "user" with "fist_name" column from ...

This blog was originally published in January 2023 and was updated in April 2024. MySQL index is a data structure used to optimize the performance of database queries at the expense of additional ...