To intuitively understand join operations, we first build a simple example database that stores grocery items and their corresponding categories. The category information is stored in the categories ...

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 ...

Any attribute that is uniquely identify a row in a table is candidate key(primary key) for the table. We select one of the candidate key as Primary key. All candidate ...