What is DBMS (Database Management System)? Application, Types & Example
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guru99.com
What is DBMS (Database Management System)? Application, Types & Example
In this DBMS tutorial, you will learn What DBMS is, Types of DBMS, Applications, Characteristics, Examples of DBMS, Advantages & Disadvantages of DBMS.
Jun 28, 2024
Primary Key Vs Foreign Key
Q1.Answer the following:(10)a. Is it mandatory for a foreign key to be a primary key in another table?b. Can foreign keys be null values in child relation?c. After enforcing foreign key constraint using on delete cascade rule, can you delete therecord in the child relation whose foreign key is not null before deleting the record in theparent relation?d. Can foreign keys have the duplicate values?e. Can there exist more than one foreign key in relation?Q2. Create fully normalized ERDs with primar
Q1.Answer the following:(10)a. Is it mandatory for a foreign key to be a primary key in another table?b. Can foreign keys be null values in child relation?c. After enforcing foreign key constraint using on delete cascade rule, can you delete therecord in the child relation whose foreign key is not null before deleting the record in theparent relation?d. Can foreign keys have the duplicate values?e. Can there exist more than one foreign key in relation?Q2. Create fully normalized ERDs with primar
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