 CREATE TABLE Users (
  Id INT NOT NULL AUTO_INCREMENT,
  FirstName VARCHAR(30) NOT NULL,
  LastName VARCHAR(30) NOT NULL,
  Gender ENUM('MALE', 'FEMALE', 'OTHER') NOT NULL,
  BirthDate DATE NOT NULL,
  BirthPlace VARCHAR(40) NOT NULL,
  Email VARCHAR(40) NOT NULL,
  ProfilePicture VARCHAR(40) NOT NULL,
  PRIMARY KEY (Id)
);

CREATE TABLE BusinessCategories (
  Id INT NOT NULL AUTO_INCREMENT,
  Name VARCHAR(30) NOT NULL,
  PRIMARY KEY (Id)
);

CREATE TABLE BusinessSubcategories (
  Id INT NOT NULL AUTO_INCREMENT,
  Category INT NOT NULL,
  Name VARCHAR(30) NOT NULL,
  PRIMARY KEY (Id),
  FOREIGN KEY (Category) REFERENCES businessCategories(Id)
);

CREATE TABLE Businesses (
  Id INT NOT NULL AUTO_INCREMENT,
  Subcategory INT DEFAULT NULL,
  HoursOfOperation VARCHAR(30) NOT NULL,
  DaysOfOperation VARCHAR(30) NOT NULL,
  ParkingType ENUM('STREET', 'GARAGE', 'LOT', 'VALET'),
  AmbientType ENUM('ROMANTIC', 'CLASSY', 'TOURISTY', 'CASUAL'),
  PRIMARY KEY (Id),
  FOREIGN KEY (Subcategory) REFERENCES BusinessSubcategories(Id) ON DELETE SET NULL
);

CREATE TABLE Addresses (
  Id INT NOT NULL,
  Street VARCHAR(30) NOT NULL,
  State VARCHAR(30) NOT NULL,
  ZipCode VARCHAR(10) NOT NULL,
  Longitude VARCHAR(10) NOT NULL,
  Latitude VARCHAR(10) NOT NULL,
  PRIMARY KEY (Id),
  FOREIGN KEY (Id) REFERENCES Businesses(Id) ON DELETE RESTRICT
);

CREATE TABLE Ratings (
  User INT NOT NULL,
  Business INT NOT NULL,
  Rating INT NOT NULL,
  PRIMARY KEY (User, Business),
  FOREIGN KEY (User) REFERENCES Users(Id) ON DELETE CASCADE,
  FOREIGN KEY (Business) REFERENCES Businesses(Id) ON DELETE CASCADE
);

CREATE TABLE CheckIns (
  Id INT NOT NULL,
  User INT NOT NULL,
  Business INT NOT NULL,
  PRIMARY KEY (Id),
  FOREIGN KEY (User) REFERENCES Users(Id) ON DELETE CASCADE,
  FOREIGN KEY (Business) REFERENCES Businesses(Id) ON DELETE CASCADE
);

CREATE TABLE Reviews (
  Id INT NOT NULL,
  Author INT NOT NULL,
  Business INT NOT NULL,
  PublishDate TIMESTAMP DEFAULT CURRENT_TIMESTAMP,
  TextualContent VARCHAR(255) NOT NULL,
  NumStars TINYINT(5) NOT NULL,
  PRIMARY KEY (Id),
  FOREIGN KEY (Author) REFERENCES Users(Id) ON DELETE CASCADE,
  FOREIGN KEY (Business) REFERENCES Businesses(Id) ON DELETE CASCADE
);

CREATE TABLE Votes (
  Review INT NOT NULL,
  User INT NOT NULL,
  Useful BOOL NOT NULL,
  PRIMARY KEY (Review, User),
  FOREIGN KEY (Review) REFERENCES Reviews(Id) ON DELETE CASCADE,
  FOREIGN KEY (User) REFERENCES Users(Id) ON DELETE CASCADE
);

CREATE TABLE Comments (
  Id INT NOT NULL AUTO_INCREMENT,
  Author INT NOT NULL,
  Review INT NOT NULL,
  PublishDate TIMESTAMP DEFAULT CURRENT_TIMESTAMP,
  TextualContent VARCHAR(255) NOT NULL,
  PRIMARY KEY (Id),
  FOREIGN KEY (Author) REFERENCES Users(Id) ON DELETE CASCADE,
  FOREIGN KEY (Review) REFERENCES Reviews(Id) ON DELETE CASCADE
);

CREATE TABLE Friends (
  UserOne INT NOT NULL,
  UserTwo INT NOT NULL,
  PRIMARY KEY (UserOne, UserTwo),
  FOREIGN KEY (UserOne) REFERENCES Users(Id) ON DELETE CASCADE,
  FOREIGN KEY (UserTwo) REFERENCES Users(Id) ON DELETE CASCADE
);

CREATE TABLE Compliments (
  Sender INT NOT NULL,
  Receiver INT NOT NULL,
  Compliment VARCHAR(255) NOT NULL,
  PRIMARY KEY (Sender, Receiver),
  FOREIGN KEY (Sender) REFERENCES Users(Id) ON DELETE CASCADE,
  FOREIGN KEY (Receiver) REFERENCES Users(Id) ON DELETE CASCADE
);

CREATE TABLE Follows (
  Follower INT NOT NULL,
  Followed INT NOT NULL,
  PRIMARY KEY (Follower, Followed),
  FOREIGN KEY (Follower) REFERENCES Users(Id) ON DELETE CASCADE,
  FOREIGN KEY (Followed) REFERENCES Users(Id) ON DELETE CASCADE
);

CREATE TABLE Photos (
  Id INT NOT NULL AUTO_INCREMENT,
  Author INT NOT NULL,
  Business INT DEFAULT NULL,
  Description VARCHAR(255) NOT NULL,
  Location VARCHAR(255) NOT NULL,
  PRIMARY KEY (Id),
  FOREIGN KEY (Author) REFERENCES Users(Id) ON DELETE CASCADE,
  FOREIGN KEY (Business) REFERENCES Businesses(Id) ON DELETE CASCADE
);

CREATE TABLE Likes (
  User INT NOT NULL,
  Photo INT NOT NULL,
  PRIMARY KEY (User, Photo),
  FOREIGN KEY (User) REFERENCES Users(Id) ON DELETE CASCADE,
  FOREIGN KEY (Photo) REFERENCES Photos(Id) ON DELETE CASCADE
);

created 1 year ago

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;