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Different Types of SQL Keys
SQL Keys play a very important role in database related task in SQL like retrieve data/record from the table according to the requirement. A key can be defined as a single or combination of multiple fields/columns in a table. With the help ...
What is PRIMARY KEY Constraint in MySQL?
In MySQL, the PRIMARY KEY constraint is used to uniquely identify each record in a table.
Primary key contains UNIQUE values only and the column defined as Primary key column can not be NULL. A table can have only one PRIMARY KEY.
PRIMARY K...
What is Auto-increment keyword in MySQL?
Auto-increment is used to allow a unique number when a new record inserted into a table. Generally we use Auto-increment to create value for primary key field automatically when a new record is inserted into a table.
Syntax:
The below stat...
Primary Key
Primary Key
A primary key in a table is a unique key that is the element in this column are unique and can not be null.
It is used to mantain the integrity.
It uniquely identify the row in the table.
It is a constraint on the table.
...
