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Learn SQL: Primary Key

Learn SQL: Primary Key

Primary key is a value, or a combination of few values from the table, uniquely defining each record in this table

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Primary Key in SQL

SQL Primary Key Explained Using Simple Examples.

SQL Primary Key Explained Using Simple Examples.

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Database Systems - Primary Keys - Creating Tables with a Primary Key in SQL

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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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