 CREATE TABLE UserProfile (
    UserID INTEGER PRIMARY KEY,
    FullName VARCHAR(30),          
    Email VARCHAR(50),              
    MobileNumber VARCHAR(20),      
    Password VARCHAR(30)            
);

INSERT INTO UserProfile VALUES(1, 'mohan', '[email protected]', '9999999999', 'mohan123'),
(2, 'poojitha', '[email protected]', '9876543210', 'pooji123'),
(3, 'kamesh', '[email protected]', '9561237890', 'kamesh123');
select * from UserProfile;

CREATE TABLE reservations (
    reservation_id INTEGER PRIMARY KEY AUTO_INCREMENT, 
    user_id INTEGER NOT NULL,                         
    check_in_date DATE NOT NULL,                      
    check_out_date DATE NOT NULL,                  
    room_number INTEGER NOT NULL,                    
    status ENUM('approved', 'canceled') NOT NULL,     
    FOREIGN KEY (user_id) REFERENCES UserProfile(UserID) 
);

INSERT INTO reservations (user_id, check_in_date, check_out_date, room_number, status) VALUES
(1, '2024-12-10', '2024-12-15', 101, 'approved'), 
(2, '2024-12-12', '2024-12-16', 102, 'approved'), 
(3, '2024-12-18', '2024-12-20', 103, 'canceled');

select *from reservations;

CREATE TABLE bills (
    bill_id INTEGER PRIMARY KEY AUTO_INCREMENT,      
    reservation_id INTEGER NOT NULL,                 
    total_amount DECIMAL(10, 2) NOT NULL,           
    additional_charges DECIMAL(10, 2) DEFAULT 0.00,  
    payment_status ENUM('paid', 'pending') NOT NULL,
    FOREIGN KEY (reservation_id) REFERENCES reservations(reservation_id)
);

INSERT INTO bills (reservation_id, total_amount, additional_charges, payment_status) VALUES
(1, 500.00, 50.00, 'paid'),       
(2, 800.00, 0.00, 'paid'),       
(3, 300.00, 25.00, 'pending'); 
select *from bills;

ALTER TABLE bills
DROP FOREIGN KEY bills_ibfk_1;

ALTER TABLE bills
ADD CONSTRAINT bills_ibfk_1 FOREIGN KEY (reservation_id) REFERENCES reservations(reservation_id) ON DELETE CASCADE;
DELETE FROM reservations
WHERE status = 'canceled';
select *from reservations;

CREATE TABLE User (
    CustomerId INTEGER PRIMARY KEY AUTO_INCREMENT,
    CustomerName VARCHAR(50) NOT NULL,
    BookingDate DATE NOT NULL,
    CheckInDate DATE NOT NULL,
    CheckOutDate DATE NOT NULL,
    PackageID INTEGER NOT NULL,
    AmountPaid DECIMAL(10, 2) NOT NULL
);

INSERT INTO User (CustomerName, BookingDate, CheckInDate, CheckOutDate, PackageID, AmountPaid) VALUES
('mohan', '2024-12-01', '2024-12-10', '2024-12-15', 101, 500.00),
('poojitha', '2024-11-20', '2024-11-25', '2024-11-30', 102, 450.00),
('kamesh', '2024-10-15', '2024-10-20', '2024-10-25', 103, 550.00);
SELECT CustomerId, CustomerName, BookingDate, CheckInDate, CheckOutDate, PackageID, AmountPaid
FROM User
WHERE CustomerName LIKE '%a' 
ORDER BY CustomerName DESC; 

CREATE TABLE RoomStatus (
    CustomerID BIGINT PRIMARY KEY,       
    CustomerName VARCHAR(50) NOT NULL,      
    Status ENUM('Vacant', 'Occupied') NOT NULL, 
    DateAvailability DATE NOT NULL,    
    Price DECIMAL(10, 2) NOT NULL   
);

INSERT INTO RoomStatus (CustomerID, CustomerName, Status, DateAvailability, Price) VALUES
(1234567890123, 'mohan', 'Occupied', '2024-12-10', 150.00),
(2345678901234, 'poojitha', 'Vacant', '2024-12-15', 100.00),
(3456789012345, 'kamesh', 'Occupied', '2024-12-12', 200.00);

select *from RoomStatus;
CREATE TABLE Complaint (
    CustomerID BIGINT NOT NULL,              
    CustomerContact VARCHAR(15),            
    RoomNumber VARCHAR(10),               
    ComplaintType ENUM('Poor housekeeping', 'Noisy guests', 'Uncomfortable beds', 'Slow service', 'Lack of amenities', 'Unfriendly staff') NOT NULL,
    Feedback ENUM('Great', 'Good') NOT NULL, 
   CONSTRAINT fk_customer FOREIGN KEY (CustomerID) REFERENCES RoomStatus(CustomerID) 
);

INSERT INTO Complaint (CustomerID, CustomerContact, RoomNumber, ComplaintType, Feedback) VALUES
(1234567890123, '1234567890', '101', 'Poor housekeeping', 'great'),  
(2345678901234, '9876543210', '102', 'Noisy guests', 'good'),   
(3456789012345, '5556667777', '103', 'Uncomfortable beds', 'great'); 


SELECT*FROM Complaint;

ALTER TABLE reservations
ADD COLUMN Upcoming_bookings_date DATE;
select *from reservations;

UPDATE bills
SET   payment_status= 'Paid'
WHERE reservation_id=1;
SELECT bill_id, reservation_id, total_amount, additional_charges, payment_status
FROM bills WHERE payment_status='Paid';

created 5 months ago by RAM MOHAN MAHIDHARA

MySQL online editor

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About MySQL

MySQL is a open-source, free and very popular relational database management system which is developed, distributed and supported by Oracle corporation.

Key Features:

Open-source relational database management systems.
Reliable, very fast and easy to use database server.
Works on client-server model.
Highly Secure and Scalable
High Performance
High productivity as it uses stored procedures, triggers, views to write a highly productive code.
Supports large databases efficiently.
Supports many operating systems like Linux*,CentOS*, Solaris*,Ubuntu*,Windows*, MacOS*,FreeBSD* and others.

Syntax help

Commands

1. CREATE

CREATE TABLE table_name (
                column1 datatype,
                column2 datatype,
                ....);

Example

CREATE TABLE EMPLOYEE (
  empId INTEGER PRIMARY KEY,
  name TEXT NOT NULL,
  dept TEXT NOT NULL
);

2. ALTER

ALTER TABLE Table_name ADD column_name datatype;

Example

INSERT INTO EMPLOYEE VALUES (0001, 'Dave', 'Sales');

3. TRUNCATE

TRUNCATE table table_name;

4. DROP

DROP TABLE table_name;

5. RENAME

RENAME TABLE table_name1 to new_table_name1;

6. COMMENT

Single-Line Comments:

 --Line1;

Multi-Line comments:

   /* Line1,
   Line2 */

DML Commands

1. INSERT

INSERT INTO table_name (column1, column2, column3, ...) VALUES (value1, value2, value3, ...);

Note: Column names are optional.

Example

INSERT INTO EMPLOYEE VALUES (0001, 'Ava', 'Sales');

2. SELECT

SELECT column1, column2, ...
FROM table_name
[where condition];

Example

SELECT * FROM EMPLOYEE where dept ='sales';

3. UPDATE

UPDATE table_name
SET column1 = value1, column2 = value2, ...
WHERE condition;

Example

UPDATE EMPLOYEE SET dept = 'Sales' WHERE empId='0001';

4. DELETE

DELETE FROM table_name where condition;

Example

DELETE from EMPLOYEE where empId='0001';

Indexes

1. CREATE INDEX

  CREATE INDEX index_name on table_name(column_name);

To Create Unique index:

  CREATE UNIQUE INDEX index_name on table_name(column_name);

2. DROP INDEX

DROP INDEX index_name ON table_name;

Views

1. Create a View

Creating a View:
CREATE VIEW View_name AS 
Query;

2. How to call view

SELECT * FROM View_name;

3. Altering a View

ALTER View View_name AS 
Query;

4. Deleting a View

DROP VIEW View_name;

Triggers

1. Create a Trigger

CREATE TRIGGER trigger_name trigger_time trigger_event
    ON tbl_name FOR EACH ROW [trigger_order] trigger_body
/* where
trigger_time: { BEFORE | AFTER }
trigger_event: { INSERT | UPDATE | DELETE }
trigger_order: { FOLLOWS | PRECEDES } */

2. Drop a Trigger

DROP TRIGGER [IF EXISTS] trigger_name;

Stored Procedures

1. Create a Stored Procedure

CREATE PROCEDURE sp_name(p1 datatype)
BEGIN
/*Stored procedure code*/
END;

2. How to call Stored procedure

CALL sp_name;

3. How to delete stored procedure

DROP PROCEDURE sp_name;

Joins

1. INNER JOIN

SELECT * FROM TABLE1 INNER JOIN TABLE2 where condition;

2. LEFT JOIN

SELECT * FROM TABLE1 LEFT JOIN TABLE2 ON condition;

3. RIGHT JOIN

SELECT * FROM TABLE1 RIGHT JOIN TABLE2 ON condition;

4. CROSS JOIN

SELECT select_list from TABLE1 CROSS JOIN TABLE2;