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Kolon Seviyesinde Veri Bütünlüğünü Sağlamak
Kolon seviyesinde tanımlanan şartlar (constraint) aynı tablo içerisinde kolonda yer alan değerlerin tutarlılığını sorgular.
Kolon seviyesinde veri bütünlüğü sağlama yollarını inceleyelim;
Primary Key:
Normalizayon kuralları gereği her tabloda en az bir anahtar alan bulunmak zorundadır. Tanımlanan bu anahtar alan primary key olarak tanımlanır ve NULLdeğer kabul etmeyen tekil bir anahtardır. Tablo…
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