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-- Count Satır Sayar
select * from kisiler;
select count(*) as 'kisi sayisi' from kisiler;
-- yasi 40 tan buyuk kac kisi var
select count(yas) from kisiler
where yas >= 40;
-- sum
-- tablodaki kisilerin yaslarinin toplami
select sum(yas) as 'Yas Toplam' from kisiler;
-- avg(X)
-- kisilerin yas ortalamasi
select avg(yas) as 'ORT.' from kisiler;
-- MIN ve max(X)
-- kisiler tablosundaki en kucuk ve en buyuk
-- yas degeri
select min(yas) as 'MIN', max(yas) as 'MAX'
from kisiler;
-- yasi, ortalamadan buyuk olan kisilerin
-- bilgilerini
select * from kisiler
where yas >= (select avg(yas) from kisiler);
-- kayit gruplama
select * from kisiler group by yas;
-- hangi yastan kac kisi var
select yas, count(*) from KISILER
group by yas;
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