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Author: MinalKulkarni07

SQL Practice 06-05-2025.sql

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+-- left join
+
+create database mpk;
+
+use mpk;
+
+CREATE TABLE Customers (
+    CustomerID INT PRIMARY KEY,
+    FirstName VARCHAR(50),
+    LastName VARCHAR(50),
+    Email VARCHAR(100)
+);
+
+CREATE TABLE Orders (
+    OrderID INT PRIMARY KEY,
+    CustomerID INT,
+    OrderDate DATE,
+    TotalAmount DECIMAL(10, 2)
+);
+
+INSERT INTO Customers (CustomerID, FirstName, LastName, Email)
+VALUES
+    (1,'Anvi','Mathur','anvimathur@booksstore.com'),
+    (2,'Tanvi','Thakur','tanvithakur@booksstore.com'),
+    (3,'Raj','Patel','rajpatel@booksstore.com'),
+    (4,'Arnav','Gupta','arnavgupta@booksstore.com'),
+    (5,'Jui','Jadhav','juijadhav@booksstore.com'),
+    (8,'Ravi','Sharma','ravisharma@booksstore.com'),
+    (10,'Geeta','Jog','geetajog@booksstore.com');
+
+INSERT INTO Orders (OrderID, CustomerID, OrderDate, TotalAmount)
+VALUES
+    (101,1,'2023-07-15',275.00),
+    (102,2,'2023-02-20',200.50),
+    (103,3,'2022-05-26',353.75),
+    (111,11,'2024-05-26',150.00),
+    (109,4,'2023-05-15',360.00),
+    (112,9,'2023-02-20',225.00);
+
+
+select * from customers;
+select * from orders;
+
+
+select customers.firstname , customers.email , orders.orderdate , orders.totalamount
+from customers left join orders 
+on customers.customerid = orders.customerid;
+
+
+-- right join
+
+select customers.firstname , customers.email , orders.orderdate , orders.totalamount
+from customers right join orders 
+on customers.customerid = orders.customerid;
+
+-- inner join
+select customers.firstname , customers.email , orders.orderdate , orders.totalamount
+from customers inner join orders 
+on customers.customerid = orders.customerid;
+
+-- full join 
+select customers.firstname , customers.email , orders.orderdate , orders.totalamount
+from customers left join orders 
+on customers.customerid = orders.customerid
+union
+select customers.firstname , customers.email , orders.orderdate , orders.totalamount
+from customers right join orders 
+on customers.customerid = orders.customerid;
+
+-- Date 
+
+SELECT NOW();             -- e.g., 2025-05-05 14:30:00
+SELECT CURDATE();        -- e.g., 2025-05-05
+SELECT CURTIME();         -- e.g., 14:30:00
+SELECT CURRENT_TIMESTAMP(); -- e.g., 2025-05-05 14:30:00
+
+select orderdate , year(orderdate) from orders;
+select orderdate , month(orderdate) from orders;
+select orderdate , day(orderdate) from orders;
+
+-- DATE_ADD
+select orderdate , DATE_ADD(orderdate , interval 7 Day) as new_date from orders;
+select orderdate , DATE_ADD(orderdate , interval 7 year) as new_date from orders;
+select orderdate , DATE_ADD(orderdate , interval 7 month) as new_date from orders;
+
+-- DATE_SUB
+
+select orderdate , DATE_SUB(orderdate , interval 4 month) as new_date from orders;
+select orderdate , DATE_SUB(orderdate , interval 4 Day) as new_date from orders;
+select orderdate , DATE_SUB(orderdate , interval 4 year) as new_date from orders;
+
+-- CONCAT
+
+select * from customers;
+
+
+-- CONCAT
+
+select * , concat(firstname," ",lastname) as full_name from customers;
+
+-- LENGTH
+select * , LENGTH(concat(firstname," ",lastname)) as full_name from customers;
+
+select * , upper(concat(firstname," ",lastname)) as full_name from customers;
+
+
+-- SUBSTRING
+
+select firstname , SUBSTRING(firstname,1,2) as Nckname from customers;
+
+-- REPLACE
+select email , REPLACE(email,'booksstore.com','bs.in') as new_email 
+from customers;
+