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select *from Brans --18
select *from Calisanlar --116
select *from Etkiler --51
select *from Hekimler --66
select *from Ilaclar --52
select *from Musteriler --131
select *from Receteler --57
select *from Stoklar --52
select *from Tedarikciler --36
select *from Turler --9
select Count(Fiyat) from Ilaclar -- Sutundaki veri olup olmamasıyla ilgilenir dolu olanların sayısını alır.
select distinct(Fiyat) from Ilaclar -- İlaçlar tablosundaki Fiyatı sutunuu farklı değerleri listeler
select IlacAdi, Distinct(Fiyat) from Ilaclar-- Hata veririr yazılmaz
select IlacAdi, Count(Fiyat) from Ilaclar-- Hata veririr yazılmaz
select IlacAdi, sum(Fiyat) from Ilaclar -- Hata veririr yazılmaz
/*Sum avg count distinct aggregate fonklar farklı bir sütunla listelenmez*/
/*
isnull()
nullif()
colesce()
*/
select isnull(Fiyat,0) from Ilaclar -- İSNULL İÇERİSİNE VERİLEN SUTUNLARA BAKAR TEK TEK EĞER NULLSA SUTUN 0 YAZAR
insert into Brans(BId) values (20)
select * from Brans
select isnull(BransAdi,'Brans Yok') from Brans
select coalesce(BransAdi,'Brans Yok') from Brans
-- isnull ile aynı işi yapar SUTUNUN VERİ TİPİNE UYGUN BİR TİP DEĞER ATAMAS YAPILMASI GEREKİR TABLODA KALICI DEĞİŞİKLİK YAPMAZ
SELECT NULLIF(Fiyat,1860) from Ilaclar --Fiyatı 1860 olan sutunları null yapar Kalıcı değildir.
select * from Musteriler where Isim like 'Ahmet%' order by DTarihi asc -- sorgunun en sonuna yazılır yazılmazsa varsayılan asc'dir
select top 3 IlacAdi,SkTarihi, Miktar,Fiyat from Ilaclar order by Miktar desc -- ilk 3 kayıtı getirir
select top 3 with ties IlacAdi,SkTarihi, Miktar,Fiyat from Ilaclar order by Miktar desc -- 3. kaydın order byla sıraladığım sutuna son değerinde olanları sıralamaya dahil eder
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