Database Concepts & Data Model – SQL
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Get it written →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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