Hiii Ayush,
A Primary key is a column or set of columns that uniquely identifies the record in the table. When a primary key is defined using multiple columns, the data from each column is used to determine whether a record/row is unique.
A Primary key is a column or set of columns that uniquely identifies the record in the table. When a primary key is defined using multiple columns, the data from each column is used to determine whether a record/row is unique.