What is primary key and foreign key in sql?

SQL

Could someone tell me what is primary key and foreign key in SQL?

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Primary key: A primary key in SQL is used to make sure that the data in the specific column is unique. It is referred to as a column that should not contain the null values. It could be either in the existing table column or a column that is specifically generated based on the defined sequence.



Foreign Key: A foriegn key in SQL is referred to as a column or a group of columns that is used to provide a link between the two tables. It is the column that is referencing the other column (most often primary key) of another table.

 

Primary key: A primary key in SQL is used to make sure that the data in the specific column is unique. It is referred to as a column that should not contain the null values. It could be either in the existing table column or a column that is specifically generated based on the defined sequence.

 
 

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