ഒരു ഡാറ്റാബേസിൽ ഓരോ റെക്കോഡും തിരിച്ചറിയുന്നത് ഏത് കീയെ അടിസ്ഥാനമാക്കിയാണ് ?
Aപ്രൈമറി കീ
Bസെക്കണ്ടറി കീ
Cടൈം സ്റ്റാമ്പ്
Dഇതൊന്നുമല്ല
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