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January 22, 2022

Database Concepts & Data Model – SQL

APA, IT management, University

9303Answer the following questions:

1. Discuss, with examples, what are “referential constraint actions”?

2. Explain why it might be more appropriate to declare an attribute that contains only digits as a character data type instead of a numeric data type.

3. Explain why the two following commands produce different results.
SELECT DISTINCT COUNT (V_CODE) FROM PRODUCT;
SELECT COUNT (DISTINCT V_CODE) FROM PRODUCT;

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