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Question Bank/Not Done/Estekhraj.sql

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+-- Section1
+SELECT id AS order_id 
+FROM orders 
+WHERE status = 'warehouse'
+ORDER BY id DESC;
+
+-- Section2
+SELECT id AS customer_id, name AS customer_name
+FROM customers
+WHERE id NOT IN (SELECT DISTINCT customer_id FROM orders)
+ORDER BY name ASC;
+
+-- Section3
+SELECT DATE(created_at) AS date, FORMAT(COUNT(*) / (SELECT COUNT(*) FROM orders WHERE status != 'canceled' AND EXISTS(SELECT 1 FROM customers WHERE is_blocked = 0))), 2) * 100, 2) AS cancellation_rate
+FROM orders 
+JOIN customers ON orders.customer_id = customers.id AND is_blocked = 0 AND status = 'canceled'
+GROUP BY DATE(created_at);

Question Bank/Not Done/Hesab o Ketab-2.sql

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+-- Section1
+SELECT * 
+FROM Customers 
+WHERE CustomerName LIKE 'A%' 
+ORDER BY CustomerName ASC;
+-- Section2
+DELETE FROM Customers 
+WHERE Country IN (
+    SELECT Country 
+    FROM (
+        SELECT Country 
+        FROM Customers 
+        GROUP BY Country
+        HAVING COUNT(DISTINCT CustomerID) < 5
+    ) AS subquery
+);
+-- Section3
+SELECT DISTINCT CustomerName
+FROM Customers 
+WHERE CustomerID IN (
+    SELECT CustomerID 
+    FROM Orders
+    WHERE OrderID IN (
+        SELECT OrderID 
+        FROM OrderDetails
+        WHERE ProductID IN (
+            SELECT ProductID 
+            FROM Products 
+            ORDER BY Price ASC 
+            LIMIT 5
+        )
+    )
+)
+ORDER BY CustomerName ASC;
+-- Section4
+SELECT DISTINCT Quantity AS Sales
+FROM OrderDetails 
+WHERE OrderID IN (
+    SELECT OrderID 
+    FROM Orders 
+    WHERE MONTH(OrderDate)= MONTH(CURRENT_DATE) 
+    AND YEAR(OrderDate) = YEAR(CURRENT_DATE)
+)
+ORDER BY Sales DESC
+LIMIT 10;

Question Bank/Not Done/Hesab o Ketab.sql

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+-- Section1
+SELECT * FROM Customers WHERE CustomerName LIKE 'A%' ORDER BY CustomerName ASC;
+
+-- Section2
+DELETE FROM Customers 
+WHERE Country IN (
+    SELECT Country 
+    FROM Customers 
+    GROUP BY Country 
+    HAVING COUNT(DISTINCT CustomerID) < 5
+);
+
+-- Section3
+SELECT DISTINCT CustomerName 
+FROM Customers c JOIN Orders o ON c.CustomerID = o.CustomerID 
+WHERE EXISTS (
+    SELECT *
+    FROM OrderDetails od JOIN Products p ON od.ProductID = p.ProductID
+    WHERE od.OrderID = o.OrderID AND p.Price <= ALL(
+        SELECT Price FROM Products ORDER BY Price LIMIT 5)
+)
+ORDER BY CustomerName ASC;
+
+-- Section4
+SELECT ProductID, SUM(Quantity) AS Sales
+FROM OrderDetails od JOIN Orders o ON od.OrderID = o.OrderId  
+WHERE OrderDate BETWEEN DATE_FORMAT(NOW() ,'%Y-%m-01') AND LAST_DAY(NOW())
+GROUP BY ProductId  
+ORDER BY Sales DESC  
+LIMIT 10;