 -- Create Restaurants Table
CREATE TABLE Restaurants (
    restaurant_id INT PRIMARY KEY,
    name VARCHAR(255) NOT NULL,
    location VARCHAR(255)
);

-- Create Customers Table
CREATE TABLE Customers (
    customer_id INT PRIMARY KEY,
    name VARCHAR(255) NOT NULL,
    email VARCHAR(255) UNIQUE
);

-- Create Menu Table
CREATE TABLE Menu (
    dish_id INT PRIMARY KEY,
    restaurant_id INT NOT NULL,
    dish_name VARCHAR(255) NOT NULL,
    price DECIMAL(10,2) NOT NULL,
    FOREIGN KEY (restaurant_id) REFERENCES Restaurants(restaurant_id)
);

-- Create Orders Table
CREATE TABLE Orders (
    order_id INT PRIMARY KEY,
    customer_id INT NOT NULL,
    restaurant_id INT NOT NULL,
    order_date DATE NOT NULL,
    FOREIGN KEY (customer_id) REFERENCES Customers(customer_id),
    FOREIGN KEY (restaurant_id) REFERENCES Restaurants(restaurant_id)
);

-- Create Order_Items Table (Many-to-Many Relationship)
CREATE TABLE Order_Items (
    order_item_id INT PRIMARY KEY AUTO_INCREMENT,
    order_id INT NOT NULL,
    dish_id INT NOT NULL,
    quantity INT NOT NULL CHECK (quantity > 0),
    FOREIGN KEY (order_id) REFERENCES Orders(order_id),
    FOREIGN KEY (dish_id) REFERENCES Menu(dish_id)
);

INSERT INTO Restaurants (restaurant_id, name, location) VALUES
(1, 'The Spice House', 'New York'),
(2, 'Ocean Breeze', 'Los Angeles'),
(3, 'Pasta Paradise', 'Chicago');

INSERT INTO Customers (customer_id, name, email) VALUES
(1, 'Alice Johnson', '[email protected]'),
(2, 'Bob Smith', '[email protected]'),
(3, 'Charlie Brown', '[email protected]');

INSERT INTO Menu (dish_id, restaurant_id, dish_name, price) VALUES
(101, 1, 'Spicy Chicken Curry', 15.99),
(102, 1, 'Paneer Butter Masala', 12.99),
(103, 2, 'Grilled Salmon', 20.99),
(104, 2, 'Shrimp Tacos', 18.99),
(105, 3, 'Penne Alfredo', 14.99),
(106, 3, 'Margherita Pizza', 16.99);

INSERT INTO Orders (order_id, customer_id, restaurant_id, order_date) VALUES

(201, 1, 1, DATE_SUB(CURDATE(), INTERVAL 10 DAY)),  
(202, 2, 1, DATE_SUB(CURDATE(), INTERVAL 15 DAY)),  
(203, 3, 2, DATE_SUB(CURDATE(), INTERVAL 20 DAY)),  
(204, 1, 2, DATE_SUB(CURDATE(), INTERVAL 25 DAY)),  
(205, 2, 3, DATE_SUB(CURDATE(), INTERVAL 30 DAY)),  
(206, 3, 3, DATE_SUB(CURDATE(), INTERVAL 35 DAY)),  
(207, 1, 1, DATE_SUB(CURDATE(), INTERVAL 40 DAY)),  
(208, 2, 1, DATE_SUB(CURDATE(), INTERVAL 45 DAY)),  
(209, 3, 2, DATE_SUB(CURDATE(), INTERVAL 50 DAY)),  
(210, 1, 2, DATE_SUB(CURDATE(), INTERVAL 55 DAY)),  
(211, 2, 3, DATE_SUB(CURDATE(), INTERVAL 60 DAY)),  
(212, 3, 3, DATE_SUB(CURDATE(), INTERVAL 65 DAY)),  
(213, 1, 1, DATE_SUB(CURDATE(), INTERVAL 70 DAY)),  
(214, 2, 1, DATE_SUB(CURDATE(), INTERVAL 75 DAY)),  
(215, 3, 2, DATE_SUB(CURDATE(), INTERVAL 80 DAY)),  
(216, 1, 2, DATE_SUB(CURDATE(), INTERVAL 85 DAY)),  
(217, 2, 3, DATE_SUB(CURDATE(), INTERVAL 90 DAY)),  
(218, 3, 3, DATE_SUB(CURDATE(), INTERVAL 95 DAY)),  
(219, 1, 1, DATE_SUB(CURDATE(), INTERVAL 100 DAY)),  
(220, 2, 1, DATE_SUB(CURDATE(), INTERVAL 105 DAY)),  
(221, 3, 2, DATE_SUB(CURDATE(), INTERVAL 110 DAY)),  
(222, 1, 2, DATE_SUB(CURDATE(), INTERVAL 115 DAY)),  
(223, 2, 3, DATE_SUB(CURDATE(), INTERVAL 120 DAY)),  
(224, 3, 3, DATE_SUB(CURDATE(), INTERVAL 125 DAY)),  
(225, 1, 1, DATE_SUB(CURDATE(), INTERVAL 130 DAY)),  
(226, 2, 1, DATE_SUB(CURDATE(), INTERVAL 135 DAY)),  
(227, 3, 2, DATE_SUB(CURDATE(), INTERVAL 140 DAY)),  
(228, 1, 2, DATE_SUB(CURDATE(), INTERVAL 145 DAY)),  
(229, 2, 3, DATE_SUB(CURDATE(), INTERVAL 150 DAY)),  
(230, 3, 3, DATE_SUB(CURDATE(), INTERVAL 155 DAY));


INSERT INTO Order_Items (order_id, dish_id, quantity) VALUES
-- Popular Dishes Ordered in the Last 6 Months
(201, 101, 2),  -- Spicy Chicken Curry
(201, 102, 3),  -- Paneer Butter Masala
(202, 103, 4),  -- Grilled Salmon
(203, 104, 1),  -- Shrimp Tacos
(204, 105, 5),  -- Penne Alfredo
(205, 106, 2),  -- Margherita Pizza
(206, 105, 3),  -- Penne Alfredo
(207, 101, 6),  -- Spicy Chicken Curry
(208, 102, 4),  -- Paneer Butter Masala
(209, 103, 3),  -- Grilled Salmon
(210, 104, 7),  -- Shrimp Tacos
(211, 105, 2),  -- Penne Alfredo
(212, 101, 5),  -- Spicy Chicken Curry
(213, 102, 2),  -- Paneer Butter Masala
(214, 103, 6),  -- Grilled Salmon
(215, 104, 3),  -- Shrimp Tacos
(216, 105, 4),  -- Penne Alfredo
(217, 106, 2),  -- Margherita Pizza
(218, 101, 1),  -- Spicy Chicken Curry
(219, 102, 3),  -- Paneer Butter Masala
(220, 103, 2),  -- Grilled Salmon
(221, 104, 4),  -- Shrimp Tacos
(222, 105, 3),  -- Penne Alfredo
(223, 106, 5),  -- Margherita Pizza
(224, 101, 6),  -- Spicy Chicken Curry
(225, 102, 4),  -- Paneer Butter Masala
(226, 103, 7),  -- Grilled Salmon
(227, 104, 2),  -- Shrimp Tacos
(228, 105, 5),  -- Penne Alfredo
(229, 106, 3),  -- Margherita Pizza
(230, 101, 4);  -- Spicy Chicken Curry

created 8 days ago by Vishal

MySQL online editor

Write, Run & Share MySQL queries online using OneCompiler's MySQL online editor and compiler for free. It's one of the robust, feature-rich online editor and compiler for MySQL. Getting started with the OneCompiler's MySQL editor is really simple and pretty fast. The editor shows sample boilerplate code when you choose language as 'MySQL' and start writing queries to learn and test online without worrying about tedious process of installation.

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;