The .......... states that no primary key value can be NULL.
.......... बताता है कि किसी भी प्राइमरी 'की' का मान NULL नहीं हो सकता है।
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Correct answer: A. Entity Integrity Constraint
Explanation
The entity integrity constraint says a primary key can never be NULL, because the key must identify every row. Referential integrity is the rule for foreign keys.
एंटिटी इंटीग्रिटी कंस्ट्रेंट कहता है कि प्राइमरी की कभी NULL नहीं हो सकती, क्योंकि उसी से हर पंक्ति की पहचान होती है। रेफरेंशियल इंटीग्रिटी फॉरेन की का नियम है।
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