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/*
AggreGate Functions
*/
use NORTHWND
go
Select
count(UnitPrice) as 'Kayıt Sayısı',--Kayıt Sayısı
Sum(UnitPrice)as 'Fiyat Toplamı',--Tüm Kayıtların Matematiksel Olarak Toplamı
AVG(UnitPrice)as 'Ortalama',
MAX(UnitPrice)as 'En Yüksek Değer',
MIN(UnitPrice)as 'En Kucuk Değer'
from Products
HAVING --AggreGate Functionlara koşul vermemizi sağlar.
MIN(UnitPrice)<3--Yukarıdakı minimum değer 3 den kucukse hepsını yazar eger buyukse hıcbır deger yazmaz.
go
--CONVERT
--Convert operasyonu Convert(Tür,Kolon) şeklinde tur cınsınden verı dondurur.
select
UnitPrice as 'Birim Fiyat',
Count(Convert(decimal,UnitPrice)) as 'Decimal Olarak Kayıt Sayısı'
from Products
Group by UnitPrice
having COUNT(unitprice)>2
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