Added queries for S7 (MySQL).
This commit is contained in:
parent
3dc3d1e78c
commit
1ca836f6a1
GPG Key ID:
C5B8BC7530F8F43F
209
Practical/Practical Exam/SQL/S7 - SQL Queries.md
Normal file
209
Practical/Practical Exam/SQL/S7 - SQL Queries.md
Normal file
@ -0,0 +1,209 @@
|
||||
# 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;
|
||||
|
||||
```
|
||||
|
||||
---
|
||||
Loading…
Reference in New Issue
Block a user