SQL Practicals

Class 12 IP SQL Practical Questions | MySQL Worksheet for Class 12

Download Latest and Complete pdf series of CBSE IP Class 12 Practical Program Worksheets with code and output covers all important topics. Practical Worksheets for Class 12 IP are designed to help students develop logical and analytical capabilities, problem solving skills, and improve their subject knowledge. these worksheets are best study materials for students designed […]

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Why foreign keys are allowed to have NULL values? Explain with an example.

Foreign Key is used to represent the relation between two tables. Because in the field with Foreign key attribute data comes from Primary key field in another related table and so Foreign key are allowed to have Null Values if it not the part of Primary key field of the related table. For example- Here

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