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Muhammad al-xorazmiy nomidagi toshkent axborot texologiyalari universiteti
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bet | 3/6 | Sana | 25.01.2024 | Hajmi | 367,92 Kb. | | #145193 |
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MORE THEN TEMPLATE
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Munosabat ustunlari atributlar deb ataladi va ularga nomlar beriladi. Munosabat atributlarining nomlaridan iborat ro‘yxatini munosabatlar sxemasi deyiladi. Bizning misolimizdagi TALABA munosabatining sxemasi quyidagicha yoziladi: TALABA (Familiyasi I.O., Tug‘ilgan sana, Bosqich, Mutaxassisligi)
Ma’lumotlarning relyasion bazasi - bu o‘zaro bog‘langan munosabatlar , ya’ni jadvallar to‘plamidir. Har qanday munosabat (jadval) kompьyuterlarning xotirasida fayl ko‘rinishda joylashtiriladi. Ularning orasida quyidagi moslik mavjud:
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