• Malumotlar bazasi
  • 159============================================================= SELECT * FROM Talaba where Yoshi < (SELECT Yoshi FROM talaba where name=’Bahodir’)
  • #155============================================================ UNIKAL maydon tushunchasi nima uchun kiritilgan




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    #155============================================================
    UNIKAL maydon tushunchasi nima uchun kiritilgan
    a) Jadvaldagi malumotlarni olib tashlash uchun
    b) Jadvallarni o’zaro bog’lash uchun
    c) Jadvallarga ma’lumotlar kiritish uchun
    d) Jadvallardagi malumotlarni o’zgartirish uchun
    #156===========================================================
    O’zgartirish so’rovlari bu-……………
    a) Bir amalni bajarish bilan bir nechta so’rovlarga o’zgartirish kiritadigan so’rov
    b) Ustida ammalr bajaruvchi so’rovlardir
    Malumotlar bazasi
    c) Ma’noga ega bo’lmagan so’zlar
    d) Bir va bir nechta amallar o’rtasida malumotlar almashinuchi so’rovlar
    #157============================================================
    Malumotlar bazasini boshqarish tizimi izlash kalitlari deb quyidagilarga aytiladi
    a) Izlash shartini qanoatlantiradigan yozuv nomerlari
    b) Malumotlar bazasi yozuvlar fayllar diapozon bo’yicha
    c) Izlash shartini aniqlaydigan mantiqiy ifodalar
    d) Qiymatlar bo’yicha izlanadigan maydonlar
    #158=============================================================
    Jadvallar kesishmasini hosil qilishda qaysi operatordan foydalanamiz
    a) INTERSECT
    b) UNION ALL
    c) UNION
    d) EXCEPT
    #159=============================================================
    SELECT * FROM Talaba where Yoshi < (SELECT Yoshi FROM talaba where name=’Bahodir’)
    a) Bahodir ismli talabaning yoshidan katta talabalarani
    b) Bahodir ismli talabadan kichik yoshli talabalarni
    c) Bahodir ismli talabalarning ichida Yoshi kattasini
    d) SQL so’rovida xatolik bor
    #160=============================================================
    Ma’lumotlar bazasini boshqarish tizimini tuzishda foydalanuvchilar nechta kategoriyaga
    bo’linadi
    a) 2
    b) 3
    c) 4
    d) 5

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    #155============================================================ UNIKAL maydon tushunchasi nima uchun kiritilgan

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