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Author: MinalKulkarni07

SQL Practice 03-05-2025.sql

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+-- distinct keywords
+use classicmodels;
+select distinct country from customers;
+select count(distinct country) from customers;
+
+-- Constraints
+create database MinalK;
+use MinalK;
+create table Customers (
+CustomerID int primary key,
+FirstName varchar(50),
+LastName varchar(50)
+);
+
+create table Orders (
+OrderID int primary key,
+CustomerID int,
+OrderDate date,
+foreign key (CustomerID) references Customers(CustomerID)
+);
+
+-- inserting records into the "Customers" and "Orders" table
+insert into Customers (CustomerID,FirstName,LastName)
+values (1,'Minal','Kulkarni'),
+(2,'Anvi','Thakare');
+
+insert into Orders (OrderID,CustomerID,OrderDate)
+values (101,1,'2024-2-25'),
+(102,2,'2024-5-15');
+
+-- unions claus
+create table Customers1 (
+CustomersID int primary key,
+FirstName varchar(50),
+LastName varchar(50),
+Email Varchar(100)
+);
+
+create table Suppliers (
+SupplierID int primary key,
+CompanyName varchar(100),
+Email varchar(100)
+);
+
+insert into Customers1 (CustomersID,FirstName,LastName,Email)
+values (1,'Minal', 'Kulkarni','minal@gmail.com'),
+(2,'Anvi', 'Thakare','anvi@gmail.com'),
+(3,'Lokesh', 'Jadhav','lokesh@gmail.com'),
+(4,'Raj', 'Gupta','raj@gmail.com'),
+(5,'Minal', 'Kulkarni','minal@gmail.com');
+
+insert into Suppliers (SupplierID, CompanyName, Email)
+values
+    (101, 'ABC Inc.', 'abc@gmail.com'),
+    (102, 'XYZ Ltd.', 'xyz@gmail.com'),
+    (103, 'Company A', 'companya@gmail.com');
+    
+select Email from Customers1 union select Email from Suppliers;
+
+-- truncate table
+truncate table Customers1;
+