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…
Data types in MySQL define the type (or nature) of data that can be stored in a particular column of a table. In other words, a data type specifies the kind of values a column can hold, such as integers,…
