= Relational Model slides for Database System Concepts by Abraham Silberschatz and others
{c}
{tag=Work by Abraham Silberschatz}
{tag=Work by Henry F. Korth}
{tag=Work by S. Sudarshan}
Primary source: https://www.db-book.com/Previous-editions/db4/slide-dir/ch3-2.pdf
Verified locator: Fourth-edition slides3.82 and3.86, Safety of Expressions; author page https://www.db-book.com/Previous-editions/db4/overview.html verifies Abraham Silberschatz, Henry F. Korth and S. Sudarshan.
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