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densk
[106]
2 years ago
14
主キーの2つの特徴は何ですか?Answer only if you know!
World Languages
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1
answer:
Soloha48
[4]
2 years ago
4
0
主キーの2つの特徴は何ですか?
主キーの2つの特徴は次のとおりです :-
それはユニークでなければなりません。
NULL値であってはなりません。
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