Category Database

A PRIMARY KEY in MySQL is a constraint that uniquely identifies each row in a database table. It ensures that the values in a specified column or combination of columns are unique and not NULL. A table can contain only…

A UNIQUE constraint in MySQL ensures that all values in a column or a group of columns are distinct across every row in a table. In simple words, the UNIQUE constraint prevents duplicate data from being inserted into a column…

The NOT NULL constraint is one of the most commonly used constraints in MySQL that prevents NULL values from being stored in a column. This constraint ensures that every row in the table must contain a value for that column.…

Constraints in MySQL are rules that govern what type of data can be inserted into a particular column of a table. In simple words, constraints are rules used to enforce limitations on the data inserted into a table. For example,…

In this tutorial, we will learn how to drop a database in MySQL. To delete a database in MySQL, we use the DROP DATABASE statement. The DROP DATABASE command is a Data Definition Language (DDL) statement used to permanently remove…