Computer Science · Database Management Systems
एक कंपोजिट प्राथमिक कुंजी (A, B) वाली डेटाबेस टेबल में, निम्नलिखित में से कौन सी स्थिति इकाई अखंडता बाधा (entity integrity constraint) का उल्लंघन करती है?
Verified Solution4 OptionsUpdated: October 2026👁️1 View
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- 1सभी पंक्तियों में गैर-शून्य (non-null), विशिष्ट संयोजन होना
- 2A = 2, B = 4 वाली एक पंक्ति
- 3A = 1, B = 2 वाली एक पंक्ति
- 4A = NULL, B = 3 वाली एक पंक्ति✓
सही उत्तर देखें
A = NULL, B = 3 वाली एक पंक्ति
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