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+# S7 - SQL Queries (in MySQL)
+
+**Problem Statement:**
+Consider following Relation
+Employee(emp_id,employee_name,street,city)
+Works(employee_name,company_name,salary)
+Company(company_name,city)
+Manages(employee_name,manager_name)
+Create above tables with appropriate constraints like primary key,
+foreign key, not null etc.
+1. Change the city of employee working with InfoSys to ‘Bangalore’
+2. Find the names of all employees who earn more than the average
+salary of all employees of their company. Assume that all people
+work for at most one company.
+3. Find the names, street address, and cities of residence for all
+employees who work for 'TechM' and earn more than $10,000.
+4. Change name of table Manages to Management.
+5. Create Simple and Unique index on employee table.
+6. Display index Information
+
+---
+
+## Creating the database
+```sql
+CREATE DATABASE Bank4;
+USE Bank4;
+
+```
+
+## Creating tables:
+
+```sql
+CREATE TABLE Account (
+  acc_no INT,
+  branch_name VARCHAR(255),
+  balance INT,
+  PRIMARY KEY (acc_no)
+);
+
+CREATE TABLE Branch (
+  branch_name VARCHAR(255),
+  branch_city VARCHAR(255),
+  assets INT,
+  PRIMARY KEY (branch_name)
+);
+
+CREATE TABLE Customer (
+  cust_name VARCHAR(255),
+  cust_street VARCHAR(255),
+  cust_city VARCHAR(255),
+  PRIMARY KEY (cust_name)
+);
+
+CREATE TABLE Depositor (
+  cust_name VARCHAR(255),
+  acc_no INT
+);
+
+CREATE TABLE Loan (
+  loan_no INT,
+  branch_name VARCHAR(255),
+  amount INT,
+  PRIMARY KEY (loan_no)
+);
+
+CREATE TABLE Borrower (
+  cust_name VARCHAR(255),
+  loan_no INT
+);
+
+```
+
+## Declaring foreign keys
+
+```sql
+ALTER TABLE Account ADD FOREIGN KEY (branch_name) REFERENCES Branch (branch_name);
+ALTER TABLE Depositor ADD FOREIGN KEY (cust_name) REFERENCES Customer (cust_name);
+ALTER TABLE Depositor ADD FOREIGN KEY (acc_no) REFERENCES Account (acc_no);
+ALTER TABLE Loan ADD FOREIGN KEY (branch_name) REFERENCES Branch (branch_name);
+ALTER TABLE Borrower ADD FOREIGN KEY (cust_name) REFERENCES Customer (cust_name);
+ALTER TABLE Borrower ADD FOREIGN KEY (loan_no) REFERENCES Loan (loan_no);
+
+```
+
+## Inserting data
+
+```sql
+INSERT INTO Branch VALUES
+('Pune_Station', 'Pune', 50000),
+('PES', 'Pune', 65000),
+('Lohegaon', 'Pune', 350000),
+('Viman Nagar', 'Pune', 850000);
+
+INSERT INTO Customer VALUES
+('Kalas', 'Street 12', 'Pune'),
+('Himanshu', 'Street 15', 'Pune'),
+('Mehul', 'Street 29', 'Pune'),
+('Macho', 'Street 59', 'Mumbai'),
+('Gundeti', 'Street 40', 'Mumbai'),
+('Salvi', 'Street 8', 'Pune'),
+('Pintu', 'Street 55', 'Ahemadnagar'),
+('Piyush', 'Street 21', 'Assam');
+
+INSERT INTO Account VALUES
+(101, 'Lohegaon', 67000),
+(102, 'PES', 4324),
+(103, 'PES', 54670),
+(104, 'Viman Nagar', 5433),
+(105, 'Pune_Station', 6462);
+
+INSERT INTO Depositor VALUES
+('Kalas', 101),
+('Macho', 104),
+('Gundeti', 105),
+('Salvi', 105);
+
+INSERT INTO Loan VALUES
+(201, 'Pune_Station', 1800),
+(202, 'PES', 8500),
+(203, 'PES', 15000),
+(204, 'Pune_Station', 5322),
+(205, 'Viman Nagar', 1300),
+(206, 'Lohegaon', 1450);
+
+INSERT INTO Borrower VALUES
+('Macho', 201),
+('Mehul', 202),
+('Himanshu', 203),
+('Salvi', 204);
+
+```
+
+## Queries
+
+1. Create a View1 to display List all customers in alphabetical order who have loan from Pune_Station branch.
+```sql
+CREATE VIEW View1 AS SELECT cust_name FROM Borrower INNER JOIN Loan ON Borrower.loan_no = Loan.loan_no WHERE branch_name = "Pune_Station" ORDER BY cust_name;
+SELECT * FROM View1;
+
+```
+
+2. Create View2 on branch table by selecting any two columns and perform insert update delete operations.
+```sql
+-- Creating view
+CREATE VIEW View2 AS SELECT branch_name, assets FROM Branch;
+SELECT * FROM View2;
+
+-- Insert operation
+INSERT INTO View2 VALUES ('Kharadi', 594000);
+INSERT INTO View2 VALUES ('Yerwada', 34004);
+SELECT * FROM View2;
+
+-- Update operation
+UPDATE View2 SET assets = 590000 WHERE branch_name = "Kharadi";
+UPDATE View2 SET assets = 24000 WHERE branch_name = "Yerwada";
+SELECT * FROM View2;
+
+-- Delete
+DELETE FROM View2 WHERE branch_name = "Yerwada";
+SELECT * FROM View2;
+
+```
+
+3. Create View3 on borrower and depositor table by selecting any one column from each table perform insert update delete operations.
+```sql
+-- Creating view
+CREATE VIEW View3 AS SELECT Borrower.cust_name, Depositor.acc_no FROM Borrower JOIN Depositor ON Borrower.cust_name = Depositor.cust_name;
+SELECT * FROM View3;
+
+-- Insert operation
+INSERT INTO Borrower (cust_name, loan_no) VALUES ('Pintu', 205);
+INSERT INTO Depositor (cust_name, acc_no) VALUES ('Pintu', 102);
+SELECT * FROM View3;
+
+-- Update operation
+UPDATE View3 SET cust_name = "Piyush" WHERE cust_name = "Pintu";
+SELECT * FROM View3;
+
+-- Delete operation
+DELETE FROM Borrower WHERE cust_name = 'Macho';
+-- This will also remove it from View3. We cannot perform delete operation directly View3 since it is created using join clause
+SELECT * FROM View3;
+
+```
+
+4. Create Union of left and right joint for all customers who have an account or loan or both at bank
+```sql
+SELECT Borrower.cust_name FROM Borrower LEFT JOIN Loan ON Borrower.loan_no = Loan.loan_no UNION SELECT Depositor.cust_name FROM Depositor RIGHT JOIN Account ON Depositor.acc_no = Account.acc_no;
+
+```
+
+5. Create Simple and Unique index.
+```sql
+-- Simple Index
+CREATE INDEX loaners ON Borrower(cust_name);
+
+-- Unique Index
+CREATE UNIQUE INDEX depos ON Depositor.(cust_name);
+
+```
+
+6. Display index Information.
+```sql
+SHOW INDEX FROM Borrower;
+SHOW INDEX FROM Depositor;
+
+```
+
+---