-- Create Employee table
CREATE TABLE Employee (
    EMPLOYEE_ID INT PRIMARY KEY,
    name VARCHAR(100),
    age INT,
    department VARCHAR(100),
    salary DECIMAL(10, 2)
);

-- Create Student table
CREATE TABLE Student (
    STUDENT_ID INT PRIMARY KEY,
    name VARCHAR(100),
    age INT,
    major VARCHAR(100),
    GPA DECIMAL(3, 2)
);

-- Create Product table
CREATE TABLE Product (
    PRODUCT_ID INT PRIMARY KEY,
    name VARCHAR(100),
    price DECIMAL(10, 2),
    category VARCHAR(100)
);

-- Create Customer table
CREATE TABLE Customer (
    CUSTOMER_ID INT PRIMARY KEY,
    name VARCHAR(100),
    email VARCHAR(100),
    phone VARCHAR(20)
);

-- Create Account table
CREATE TABLE Account (
    ACCOUNT_ID INT PRIMARY KEY,
    account_number VARCHAR(20),
    balance DECIMAL(15, 2),
    type VARCHAR(100)
);

-- Create Person table
CREATE TABLE Person (
    PERSON_ID INT PRIMARY KEY,
    name VARCHAR(100),
    age INT,
    gender VARCHAR(10)
);

-- Insert data into Employee table
INSERT INTO Employee (EMPLOYEE_ID, name, age, department, salary) 
VALUES 
(1, 'John Doe', 30, 'IT', 50000.00),
(2, 'Jane Smith', 35, 'HR', 55000.00),
(3, 'Michael Johnson', 28, 'Finance', 60000.00),
(4, 'Emily Davis', 32, 'Marketing', 52000.00),
(5, 'David Wilson', 40, 'Sales', 58000.00);

-- Insert data into Student table
INSERT INTO Student (STUDENT_ID, name, age, major, GPA) 
VALUES 
(1, 'Alice Johnson', 20, 'Computer Science', 3.75),
(2, 'Bob Smith', 22, 'Engineering', 3.50),
(3, 'Carol Brown', 21, 'Mathematics', 3.90),
(4, 'Dan White', 23, 'Physics', 3.80),
(5, 'Eve Taylor', 19, 'Biology', 3.85);

-- Insert data into Product table
INSERT INTO Product (PRODUCT_ID, name, price, category) 
VALUES 
(1, 'Laptop', 1000.00, 'Electronics'),
(2, 'Shirt', 25.00, 'Clothing'),
(3, 'Book', 15.00, 'Stationery'),
(4, 'Headphones', 50.00, 'Electronics'),
(5, 'Watch', 200.00, 'Accessories');

-- Insert data into Customer table
INSERT INTO Customer (CUSTOMER_ID, name, email, phone) 
VALUES 
(1, 'John Smith', '[email protected]', '123-456-7890'),
(2, 'Alice Johnson', '[email protected]', '987-654-3210'),
(3, 'Bob Brown', '[email protected]', '456-789-0123'),
(4, 'Emily Davis', '[email protected]', '789-012-3456'),
(5, 'David Wilson', '[email protected]', '321-654-9870');

-- Insert data into Account table
INSERT INTO Account (ACCOUNT_ID, account_number, balance, type) 
VALUES 
(1, '1234567890', 10000.00, 'Savings'),
(2, '9876543210', 5000.00, 'Checking'),
(3, '4567890123', 7500.00, 'Savings'),
(4, '7890123456', 12000.00, 'Checking'),
(5, '3216549870', 9000.00, 'Savings');

-- Insert data into Person table
INSERT INTO Person (PERSON_ID, name, age, gender) 
VALUES 
(1, 'John Doe', 30, 'Male'),
(2, 'Jane Smith', 35, 'Female'),
(3, 'Michael Johnson', 28, 'Male'),
(4, 'Emily Davis', 32, 'Female'),
(5, 'David Wilson', 40, 'Male');

-- Fetch all data from Employee table
SELECT * FROM Employee;

-- Fetch all data from Student table
SELECT * FROM Student;

-- Fetch all data from Product table
SELECT * FROM Product;

-- Fetch all data from Customer table
SELECT * FROM Customer;

-- Fetch all data from Account table
SELECT * FROM Account;

-- Fetch all data from Person table
SELECT * FROM Person;

-- Drop tables
DROP TABLE Employee;
DROP TABLE Student;
DROP TABLE Product;
DROP TABLE Customer;
DROP TABLE Account;
DROP TABLE Person;

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;