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TVORBA DATABÁZÍ
Tomáš Tesařík
     MS2B
POPIS DATABÁZOVÉHO SYSTÉMU
   Skládá se z různých podpůrných programů a programů pro
    práci s databázemi
   Pro manipulaci z daty se využívá jazyku SQL
   Soubory mohou být značně rozsáhlé a lze v nich
    vyhledávat, třídit, organizovat, měnit, mazat, zadávat, různý
    m způsobem zobrazovat a podobně.
   Možnost naprogramování aplikace, umožňující použití
    databázový systém na konkrétní účel
TABULKY DATABÁZOVÉHO SYSTÉMU
   Tabulky slouží k ukládání informací, které spolu nějakým
    způsobem souvisí
   Za pomoci relací propojujeme tabulky; např. konkrétní řádek
    v první tabulce s druhým konkrétním řádkem v druhé
    tabulce
   Relace jsou různé, výše zvýšený příklad je relace 1:1, ale
    jsou i 1:N nebo N:N
RELACE
ZÁZNAMY

 jsou to konkrétní data uložená v databázi
PRIMÁRNÍ KLÍČ
   sloupec, jasně identifikující záznam, znamená to že sloupec
    musí být u každého záznamu jiný
   Pokud by jste tedy v databázi chtěli mít alba o stejné
    ceně, nemohl by primární klíč být sloupec Cena.
   Primární klíč se používá k vytváření relací mezi tabulkami.

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Prezentace tvorba databází

  • 2. POPIS DATABÁZOVÉHO SYSTÉMU  Skládá se z různých podpůrných programů a programů pro práci s databázemi  Pro manipulaci z daty se využívá jazyku SQL  Soubory mohou být značně rozsáhlé a lze v nich vyhledávat, třídit, organizovat, měnit, mazat, zadávat, různý m způsobem zobrazovat a podobně.  Možnost naprogramování aplikace, umožňující použití databázový systém na konkrétní účel
  • 3. TABULKY DATABÁZOVÉHO SYSTÉMU  Tabulky slouží k ukládání informací, které spolu nějakým způsobem souvisí  Za pomoci relací propojujeme tabulky; např. konkrétní řádek v první tabulce s druhým konkrétním řádkem v druhé tabulce  Relace jsou různé, výše zvýšený příklad je relace 1:1, ale jsou i 1:N nebo N:N
  • 5. ZÁZNAMY  jsou to konkrétní data uložená v databázi
  • 6. PRIMÁRNÍ KLÍČ  sloupec, jasně identifikující záznam, znamená to že sloupec musí být u každého záznamu jiný  Pokud by jste tedy v databázi chtěli mít alba o stejné ceně, nemohl by primární klíč být sloupec Cena.  Primární klíč se používá k vytváření relací mezi tabulkami.