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Understanding SQL Primary Keys by Akash Chandravanshi is a document available to read on EtoBox.

What is Understanding SQL Primary Keys about?

The document discusses SQL primary keys and foreign keys. 1. A PRIMARY KEY is a column or set of columns used to uniquely identify each row in a database table. It must contain unique values and cannot contain NULL values. 2. A FOREIGN KEY is a key used to link two tables together by referencing the PRIMARY KEY of another table. It acts as a cross-reference between two related tables. 3. PRIMARY KEY and FOREIGN KEY constraints can be created when defining a table using the CREATE TABLE statement or added

Author

Akash Chandravanshi

Language

EN