Create SQLQuery.sql

youtubeLearing/sql/SQLQuery.sql

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+--Select
+Select ContactName Adi,CompanyName Sirketadi,City Sehir from Customers
+Select ContactName,CompanyName,City from Customers
+
+Select*from Customers where City = 'Berlin'
+
+case insensitive
+
+sElEcT * from Products where CategoryID =1 or CategoryID=3
+
+sElEcT * from Products where CategoryID =1 and UnitPrice<10
+
+Select*from Products order by CategoryID, ProductName
+
+Select*from Products order by UnitPrice desc
+
+select count(*) adet from Products where CategoryID=2
+
+select CategoryID, count(*)from Products where UnitPrice>20 group by CategoryID having Count(*)<10
+
+select Products.ProductID,Products.	ProductName,Products.UnitPrice,Categories.CategoryName from  Products inner join Categories on Products.CategoryID = Categories.CategoryID
+where Products.UnitPrice<10
+
+
+--DTO Data Transformation object
+select*from Products p left join [Order Details] od on p.ProductID=od.ProductID
+
+Select* from Customers c left join Orders o on c.CustomerID= o.CustomerID 
+
+select * from Customers c left join Orders o on c.CustomerID= o.CustomerID 
+where o.CustomerID is null