 CREATE TABLE Students (StudentID VARCHAR (5) PRIMARY KEY NOT NULL,
FullName TEXT NOT NULL,
Gender TEXT NOT NULL,
DateOfBirth DATE NOT NULL,
GradeLevel INTEGER NOT NULL);

INSERT INTO Students (StudentID, FullName, Gender, DateOfBirth, GradeLevel) VALUES
('23H01', 'John Smith', 'Male', '2009/05/12', 10),
('23H02', 'Emma Johnson', 'Female', '2009/08/23', 10),
('23H03', 'Michael Williams', 'Male', '2009/03/17', 10),
('23H04', 'Olivia Brown', 'Female', '2009/11/02', 10),
('23H05', 'William Jones', 'Male', '2009/07/08', 10),
('23H06', 'Sophia Davis', 'Female', '2009/02/14', 10),
('23H07', 'Daniel Miller', 'Male', '2009/09/30', 10),
('23H08', 'Ava Wilson', 'Female', '2009/06/25', 10),
('23H09', 'Alexander Taylor', 'Male', '2009/04/19', 10),
('23H10', 'Mia Anderson', 'Female', '2009/10/11', 10),
('24H01', 'Ethan Martinez', 'Male', '2008/12/03', 11),
('24H02', 'Isabella Garcia', 'Female', '2008/07/15', 11),
('24H03', 'Mason Rodriguez', 'Male', '2008/11/28', 11),
('24H04', 'Sophia Hernandez', 'Female', '2008/04/20', 11),
('24H05', 'Logan Lopez', 'Male', '2008/09/07', 11),
('24H06', 'Mia Gonzales', 'Female', '2008/03/12', 11),
('24H07', 'Lucas Perez', 'Male', '2008/06/01', 11),
('24H08', 'Amelia Torres', 'Female', '2008/10/24', 11),
('24H09', 'Oliver Flores', 'Male', '2008/02/08', 11),
('24H10', 'Harper Sanchez', 'Female', '2008/05/19', 11),
('25H01', 'Mohamed Ahmed', 'Male', '2007/11/10', 12),
('25H02', 'Charlotte Kim', 'Female', '2007/08/22', 12),
('25H03', 'Samuel Lee', 'Male', '2007/01/31', 12),
('25H04', 'Emily Patel', 'Female', '2007/06/14', 12),
('25H05', 'Jacob Kim', 'Male', '2007/04/25', 12),
('25H06', 'Grace Chang', 'Female', '2007/09/19', 12),
('25H07', 'Noah Gupta', 'Male', '2007/03/08', 12),
('25H08', 'Lily Shah', 'Female', '2007/10/01', 12),
('25H09', 'Carter Singh', 'Male', '2007/05/04', 12),
('25H10', 'Chloe Patel', 'Female', '2007/02/15', 12);

Select * from Students;

CREATE TABLE Courses ( 
CourseID VARCHAR (6),
Name TEXT,
CreditHours INTEGER,
Teacher TEXT,
GradeLevel INTEGER, 
Elective BOOLEAN);

INSERT INTO Courses (CourseID, Name, CreditHours, Teacher, GradeLevel, Elective) VALUES
('G10C01', 'Mathematics', 4,  'Mr Kim', 10, False),
('G10C02', 'English Literature', 4, 'Ms Brown', 10, False),
('G10C03', 'Biology', 4, 'Mr Hossam', 10, False),
('G10C04', 'French', 3, 'Ms Smith', 10, True),
('G10C05', 'Art', 3, 'Mr Hernandez', 10, True),
('G10C06', 'Computer Science', 3, 'Mr Wilson', 10, True),
('G10C07', 'Economics', 3, 'Ms Johnson', 10, True),
('C11C01', 'Mathematics', 4, 'Ms Anderson', 11, False),
('G11C02', 'English Literature', 4, 'Mrs Samar', 11, False),
('G11C03', 'Chemistry', 4, 'Ms Amani', 11, False),
('G11C04', 'Spanish', 3, 'Mrs Nahla',11, True),
('G11C05', 'PE', 3, 'Mr Hazem', 11, True),
('G11C06', 'Psychology', 3, 'Mr Miller', 11, True),
('G11C07', 'Accounting', 3, 'Ms Aya', 11, True),
('G12C01', 'Mathematics', 4, 'Mr Mostafa', 12, False),
('G12C02', 'English Literature', 4, 'Ms Nour', 12, False),
('G12C03', 'Physics', 4, 'Mr Zamzam', 12, False),
('G12C04', 'Mandarin', 3, 'Mrs Olivia', 12, True),
('G12C05', 'Art', 3, 'Ms Martinez', 12, True),
('G12C06', 'History', 3, 'Mr Mohamed' ,12, True),
('G12C07', 'PE', 3, 'Mr Taylor', 12, True);

Select * from Courses;

CREATE TABLE Enrollment (EnrollmentID INTEGER PRIMARY KEY, 
CourseID VARCHAR (6), 
StudentID VARCHAR (5));

INSERT INTO Enrollment (EnrollmentID, CourseID, StudentID) VALUES
(1, 'G10C04', '23H01'),
(2, 'G10C07', '23H01'),
(3, 'G10C05', '23H02'),
(4, 'G10C04', '23H02'),
(5, 'G10C06', '23H03'),
(6, 'G10C04', '23H03'),
(7, 'G10C05', '23H04'),
(8, 'G10C07', '23H04'),
(9, 'G10C04', '23H05'),
(10, 'G10C06', '23H05'),
(11, 'G10C07', '23H06'),
(12, 'G10C05', '23H06'),
(13, 'G10C04', '23H07'),
(14, 'G10C06', '23H07'),
(15, 'G10C07', '23H08'),
(16, 'G10C05', '23H08'),
(17, 'G10C06', '23H09'),
(18, 'G10C04', '23H09'),
(19, 'G10C05', '23H10'),
(20, 'G10C07', '23H10'),
(21, 'G11C06', '24H01'),
(22, 'G11C04', '24H01'),
(23, 'G11C05', '24H02'),
(24, 'G11C06', '24H02'),
(25, 'G11C07', '24H03'),
(26, 'G11C04', '24H03'),
(27, 'G11C05', '24H04'),
(28, 'G11C06', '24H04'),
(29, 'G11C04', '24H05'),
(30, 'G11C07', '24H05'),
(31, 'G11C05', '24H06'),
(32, 'G11C06', '24H06'),
(33, 'G11C04', '24H07'),
(34, 'G11C06', '24H07'),
(35, 'G11C05', '24H08'),
(36, 'G11C04', '24H08'),
(37, 'G11C07', '24H09'),
(38, 'G11C05', '24H09'),
(39, 'G11C06', '24H10'),
(40, 'G11C04', '24H10'),
(41, 'G12C07', '25H01'),
(42, 'G12C04', '25H01'),
(43, 'G12C06', '25H02'),
(44, 'G12C05', '25H02'),
(45, 'G12C07', '25H03'),
(46, 'G12C04', '25H03'),
(47, 'G12C05', '25H04'),
(48, 'G12C07', '25H04'),
(49, 'G12C06', '25H05'),
(50, 'G12C04', '25H05'),
(51, 'G12C07', '25H06'),
(52, 'G12C05', '25H06'),
(53, 'G12C04', '25H07'),
(54, 'G12C06', '25H07'),
(55, 'G12G07', '25H08'),
(56, 'G12C04', '25H08'),
(57, 'G12C05', '25H09'),
(58, 'G12C07', '25H09'),
(59, 'G12C04', '25H10'),
(60, 'G12C05', '25H10');

Select * from Enrollment;

UPDATE Courses set Teacher = 'Ms Mona' where CourseID = 'G11C07';
Select * from Courses;

DELETE from Students where Fullname = 'Mohamed Ahmed';
Select * from Students;

Update Enrollment set CourseID = 'G11C07' where EnrollmentID = 28 and CourseID = 'G11C06';
Update Enrollment set CourseID = 'G11C04' where EnrollmentID = 37 and CourseID = 'G11C07';
Select * from Enrollment;

Insert into Courses Values ('G10C08', 'Computer Science Fundamentals', 3, 'Ms Mirna', 10, True);
Select * from Courses;

SELECT Students.FullName, Students.StudentID, Courses.Name as CourseName, Courses.Teacher FROM Students  JOIN Enrollment ON Students.StudentID = Enrollment.StudentID JOIN Courses ON Enrollment.CourseID = Courses.CourseID WHERE Students.GradeLevel = 12;

Select count(StudentID) from Enrollment;

Select * from Courses where Teacher = 'Ms. Mona Ashraf';

Select * from Students order BY FullName;

Select FullName, DateOfBirth, TIMESTAMPDIFF(YEAR, DateOfBirth, CURDATE()) AS Age FROM Students ORDER BY DateOfBirth; SELECT FullName, DateOfBirth,TIMESTAMPDIFF(YEAR, DateOfBirth, CURDATE())  AS Age FROM Students ORDER BY  DateOfBirth  LIMIT 1; SELECT  FullName, DateOfBirth, TIMESTAMPDIFF(YEAR, DateOfBirth, CURDATE()) AS Age FROM  Students ORDER BY  DateOfBirth DESC LIMIT 1; 

Delete from Enrollment where CourseID = 'G10C05';
Delete from Enrollment where CourseID = 'G12C06';
Select * from Enrollment;

Select Name from Courses where GradeLevel = 11 and Elective = True;

Select sum(CreditHours) from Courses;

created 1 year ago by Ahmed

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;