 -- Step 2

CREATE TABLE employers (
  WORKER_ID INT NOT NULL,
  FIRST_NAME VARCHAR(255) NOT NULL,
  LAST_NAME VARCHAR(255) NOT NULL,
  SALARY INT NOT NULL,
  JOINING_DATE DATE NOT NULL,
  DEPARTMENT VARCHAR(255) NOT NULL,
  PRIMARY KEY (WORKER_ID)
);
-- Step 3
INSERT INTO employers (WORKER_ID, FIRST_NAME, LAST_NAME, SALARY, JOINING_DATE, DEPARTMENT)
VALUES (1, 'Monika', 'Arora', 100000, '20/02/14 9:00', 'HR');
INSERT INTO employers (WORKER_ID, FIRST_NAME, LAST_NAME, SALARY, JOINING_DATE, DEPARTMENT)
VALUES (2, 'Niharika', 'Verma', 80000, '11/06/14 9:00', 'Admin');
INSERT INTO employers (WORKER_ID, FIRST_NAME, LAST_NAME, SALARY, JOINING_DATE, DEPARTMENT)
VALUES (3, 'Vishal', 'Singhal', 300000, '20/02/14 9:00', 'HR');
INSERT INTO employers (WORKER_ID, FIRST_NAME, LAST_NAME, SALARY, JOINING_DATE, DEPARTMENT)
VALUES (4, 'Amitabh', 'Singh', 500000, '20/02/14 9:00', 'Admin');
INSERT INTO employers (WORKER_ID, FIRST_NAME, LAST_NAME, SALARY, JOINING_DATE, DEPARTMENT)
VALUES (5, 'Vivek', 'Bhati', 500000, '11/06/14 9:00', 'Admin');
INSERT INTO employers (WORKER_ID, FIRST_NAME, LAST_NAME, SALARY, JOINING_DATE, DEPARTMENT)
VALUES (6, 'Vipul', 'Diwan', 200000, '11/06/14 9:00', 'Account');
INSERT INTO employers (WORKER_ID, FIRST_NAME, LAST_NAME, SALARY, JOINING_DATE, DEPARTMENT)
VALUES (7, 'Satish', 'Kumar', 75000, '20/01/14 9:00', 'Account');
INSERT INTO employers (WORKER_ID, FIRST_NAME, LAST_NAME, SALARY, JOINING_DATE, DEPARTMENT)
VALUES (8, 'Geetika', 'Chauhan', 90000, '11/04/14 9:00', 'Admin');

-- Step 4
-- Display entire table
SELECT * FROM employers;

-- Save query as "Entire Table"
CREATE OR REPLACE VIEW Entire_Table AS
SELECT * FROM employers;


-- Step 5
-- The word UNIQUE is reserved, I will use Uniqu
-- Display unique values of "Department"
SELECT  DISTINCT DEPARTMENT FROM employers;

-- Save query as "Unique", es una palabra reservada
CREATE OR REPLACE VIEW Uniqu AS
SELECT DISTINCT DEPARTMENT FROM employers;

SELECT * FROM Uniqu;

-- Step 6
-- Display "First_Name" in upper case
SELECT UPPER(FIRST_NAME) AS FIRST_NAME FROM employers;

-- Save query as "Upper Case"
CREATE OR REPLACE VIEW Upper_Case AS
SELECT UPPER(FIRST_NAME) AS FIRST_NAME FROM employers;

-- Step 7
-- Display entire table which is ordered by "First_Name" in ascending order
SELECT * FROM employers ORDER BY FIRST_NAME ASC;

-- Save query as "Ascending Order"
CREATE OR REPLACE VIEW Ascending_Order AS
SELECT * FROM employers ORDER BY FIRST_NAME ASC;

-- Step 8
-- Display entire table which is ordered by “First_Name” in Ascending order and “Department” in Descending order
SELECT * FROM employers ORDER BY FIRST_NAME ASC, DEPARTMENT DESC;

-- Save query as "ASC and Desc"
CREATE OR REPLACE VIEW ASC_and_Desc AS
SELECT * FROM employers ORDER BY FIRST_NAME ASC, DEPARTMENT DESC;

-- Step 9
-- Display entire table which the “First_Name" does not contain “Vipul” and “Satish”
SELECT * FROM employers WHERE FIRST_NAME NOT LIKE '%Vipul%' AND FIRST_NAME NOT LIKE '%Satish%';

-- Save query as "Not Like"
CREATE OR REPLACE VIEW Not_Like AS
SELECT * FROM employers WHERE FIRST_NAME NOT LIKE '%Vipul%' AND FIRST_NAME NOT LIKE '%Satish%';

-- Step 10
-- Display the “First_Name” from the employer’s table whose “First_Name” contains “a”
SELECT FIRST_NAME FROM employers WHERE FIRST_NAME LIKE '%a%';

-- Save query as "First Name"
CREATE OR REPLACE VIEW First_Name AS
SELECT FIRST_NAME FROM employers WHERE FIRST_NAME LIKE '%a%';

-- Step 11
-- Display the entire table whose SALARY lies between 100000 and 500000
SELECT * FROM employers WHERE SALARY BETWEEN 100000 AND 500000;

-- Save query as "Salary"
CREATE OR REPLACE VIEW Salary AS
SELECT * FROM employers WHERE SALARY BETWEEN 100000 AND 500000;

-- Step 12
-- Display the entire table with salaries >= 50000 and <= 100000
SELECT * FROM employers WHERE SALARY >= 50000 AND SALARY <= 100000;

-- Save query as "Salaries"
CREATE OR REPLACE VIEW Salaries AS
SELECT * FROM employers WHERE SALARY >= 50000 AND SALARY <= 100000;

created 1 year ago by Arturo Mejía

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;