Database System Concepts
Database System Concepts
7th Edition
ISBN: 9780078022159
Author: Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan
Publisher: McGraw-Hill Education
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Concept explainers

SQL Query
Structured Query Language is the full form of SQL. It is one of the standard languages to deal with the relational database. It is used to insert, update, delete, and search the records stored in a RDBMS. The relational databases are created and managed …
Question

Which of the following is true of foreign keys?

 
 

  • A foreign key should always be linked to a primary key of another table.

  • A foreign key could be linked to a candidate key of a table.

  • A foreign key is not needed if the data type is different.

  • A foreign key can be linked to any foreign key.

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