create table Employees(EMPLOYEE_ID INT,FIRST_NAME varchar(20),LAST_NAME varchar(20),EMAIL varchar(50),PHONE_NUMBER long,HIRE_DATE date,JOB_ID int,SALARY long,COMMISSION_PCT long ,MANAGER_ID int,DEPARTMENT_ID int);
insert into Employees(EMPLOYEE_ID ,FIRST_NAME ,LAST_NAME ,EMAIL ,PHONE_NUMBER ,HIRE_DATE ,JOB_ID ,SALARY ,COMMISSION_PCT ,MANAGER_ID ,DEPARTMENT_ID )
values
(1,"vansh","tuteja","123@gmail","1234567890","2019-03-05",11,120000,20000,111,1111),
(2,"rohit","tuteja","13@gmail","1434567895","2021-03-01",22,100000,15000,222,2222),
(3,"ansh","sharma","234@gmail","1634567892","2020-04-01",33,90000,2000,333,3333),
(4,"ram","arora","345@gmail","1234527891","2016-02-02",44,150000,25000,444,4444);
select * from Employees;


create table job_history(EMPLOYEE_ID int,START_DATE date,END_DATE date,JOB_ID int,DEPARTMENT_ID int);
insert into job_history(EMPLOYEE_ID,START_DATE,END_DATE,JOB_ID,DEPARTMENT_ID)
values
(1,"2019-03-12","2024-03-05",11,1111),
(2,"2021-03-16","2024-03-01",22,2222),
(3,"2020-04-23","2023-04-01",33,3333),
(4,"2016-02-20","2018-02-02",44,4444);
select * from job_history;

create table locations(LOCATION_ID int,STREET_ADDRESS varchar(50),POSTAL_CODE long,CITY varchar(20),STATE_PROVINCE varchar(20),COUNTRY_ID int);
insert into locations(LOCATION_ID,STREET_ADDRESS,POSTAL_CODE,CITY,STATE_PROVINCE,COUNTRY_ID)
values
(21,"ploatno.16,shivam nagar",302017,"jaipur","rajasthan",211),
(22,"1 ka 1 shivaji park",301001,"alwar","rajasthan",222),
(23,"street 12",302001,"delhi","delhi",233),
(24,"plotno.18 shiv nagar",301002,"kota","rajasthan",244);
select * from locations;

create table jobs(JOB_ID int ,JOB_TITLE varchar(20),MIN_SALARY long,MAX_SALARY long);
insert into jobs(JOB_ID,JOB_TITLE,MIN_SALARY,MAX_SALARY)
values
(11,"manager",50000,200000),
(22,"team leader",25000,100000),
(33,"employee",20000,90000),
(44,"worker",15000,40000);
select * from jobs;


create table counteries(COUNTRY_ID int,COUNTRY_NAME varchar(20),REGION_ID varchar(20));
insert into counteries(COUNTRY_ID,COUNTRY_NAME,REGION_ID)
values
(211,"INDIA",311),
(222,"bharat",322),
(233,"INDIA",333),
(244,"bharat",344);
select * from counteries;

create table departments(DEPARTMENT_ID int,DEPARTMENT_NAME varchar(20),MANAGER_ID int,LOCATION_ID int);
insert into departments(DEPARTMENT_ID,DEPARTMENT_NAME,MANAGER_ID,LOCATION_ID)
values

(1111,"Data analysis",111,21),
(2222,"Data management",222,22),
(3333,"Programming",333,23),
(4444,"Testing",444,24),
(5555,"Data analysis",555,25);
select * from departments;

create table regions(REGION_ID int,REGION_NAME varchar(20));
insert into regions(REGION_ID,REGION_NAME)
values
(311,"Asia"),
(322,"Asia"),
(333,"Asia"),
(344,"Asia");
select * from regions;

  
select departments.DEPARTMENT_ID,departments.DEPARTMENT_NAME,departments.LOCATION_ID,locations.STREET_ADDRESS,locations.CITY,locations.STATE_PROVINCE,counteries.COUNTRY_NAME
from ((locations
inner join departments on locations.LOCATION_ID = departments.LOCATION_ID)
inner join counteries on locations.COUNTRY_ID = counteries.COUNTRY_ID);

select Employees.FIRST_NAME,Employees.LAST_NAME,Employees.DEPARTMENT_ID, departments.DEPARTMENT_NAME
from Employees
inner join departments on Employees.MANAGER_ID = departments.MANAGER_ID;

select Employees.FIRST_NAME,Employees.LAST_NAME,jobs.JOB_TITLE,Employees.DEPARTMENT_ID, departments.DEPARTMENT_NAME
from ((Employees
inner join jobs on Employees.JOB_ID = jobs.JOB_ID)
inner join departments on Employees.MANAGER_ID = departments.MANAGER_ID);

select EMPLOYEE_ID,LAST_NAME,MANAGER_ID from Employees;

select Employees.FIRST_NAME,Employees.LAST_NAME,Employees.HIRE_DATE 
from Employees
where HIRE_DATE > "2019-03-05";

select DEPARTMENT_NAME,count(DEPARTMENT_NAME) from departments group by DEPARTMENT_NAME;

select  job_history.EMPLOYEE_ID,jobs.JOB_TITLE,DATEDIFF(job_history.END_DATE,job_history.START_DATE) AS DURATION_IN_DAYS
from job_history
inner join jobs on jobs.JOB_ID = job_history.JOB_ID
where job_history.JOB_ID = 22;

select departments.DEPARTMENT_ID,departments.DEPARTMENT_NAME,Employees.FIRST_NAME
from departments
inner join Employees on departments.DEPARTMENT_ID = Employees.DEPARTMENT_ID;

select departments.DEPARTMENT_NAME,concat(Employees.FIRST_NAME," ",Employees.LAST_NAME)AS Manager_Name,locations.CITY 
from ((departments
inner join locations on locations.LOCATION_ID = departments.LOCATION_ID)
inner join Employees on Employees.DEPARTMENT_ID = departments.DEPARTMENT_ID);

select JOB_TITLE,((MIN_SALARY+MAX_SALARY)/2) as AVG_SALARY
from jobs;

select jobs.JOB_TITLE,concat(Employees.FIRST_NAME," ",Employees.LAST_NAME)AS EMPLOYEE_NAME,
(Employees.SALARY - jobs.MIN_SALARY)AS SALARY_Difference
from Employees
join jobs on Employees.JOB_ID = jobs.JOB_ID;

select job_history.*
from job_history
join Employees on Employees.EMPLOYEE_ID = job_history.EMPLOYEE_ID
where Employees.SALARY >100000 ;

select 
departments.DEPARTMENT_NAME,concat(Employees.FIRST_NAME," ",Employees.LAST_NAME)as MANAGER_NAME,
Employees.HIRE_DATE AS MANAGER_HIRE_DATE,
Employees.SALARY AS MANGER_SALARY
FROM
DEPARTMENTS
join
Employees ON departments.MANAGER_ID=Employees.MANAGER_ID
WHERE 
datediff(NOW(),Employees.HIRE_DATE) > 4*365;
by

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;