 
-- create table 
CREATE TABLE employees (
  EMPNO INTEGER PRIMARY KEY,
  ENAME varchar(255) NOT NULL,
  JOB varchar(255) NOT NULL,
  MGR INTEGER,
  HIREDATE date NOT NULL,
  Salary INTEGER NOT NULL,
  COMM varchar(255),
  DEPTNO INTEGER NOT NULL
);
-- insert 
INSERT INTO employees 
VALUES (7369, 'SMITH', 'CLERK', 7902, '1980/12/17', 800, NULL, 20),
       (7499, 'ALLEN', 'SALESMAN', 7698, '1981/02/20', 1600, 300, 30),
       (7521, 'WARD', 'SALESMAN', 7698, '1981/02/22', 1250, 500, 30),
       (7566, 'JONES', 'MANAGER', 7839, '1980/08/02', 2975, NULL, 20),
       (7654, 'MARTIN', 'SALESMAN', 7698, '1981/09/28', 1250, 1400, 30),
       (7698, 'BLAKE', 'MANAGER', 7839, '1981/05/01', 2850, NULL, 30),
       (7782, 'CLARK', 'MANAGER', 7839, '1981/06/09', 2450, NULL, 20),
       (7788, 'SCOTT', 'ANALYST', 7566, '1982/12/09', 3100, NULL, 30),
       (7839, 'KING', 'PRESIDENT',NULL , '1981/11/17', 5000, NULL, 10),
       (7844, 'TURNER', 'SALESMAN', 7698, '1981/09/08', 1500, 0, 30),
       (7876, 'ADAMS', 'CLERK', 7788, '1983/01/12', 1100, NULL, 20),
       (7900, 'JAMES', 'CLERK', 7698, '1981/12/03', 950, NULL, 30),
       (7902, 'FORD', 'ANALYST', 7566, '1981/12/03', 3000, NULL, 20),
       (7934, 'MILLER', 'CLERK', 7782, '1983/01/23', 1300, NULL, 20);
       
-- CREATE TABLE 2" 

CREATE TABLE depts (
  DEPTNO INTEGER PRIMARY KEY,
  DNAME varchar(255) NOT NULL,
  Location varchar(255) NOT NULL
);
-- insert 
INSERT INTO depts 
VALUES (10, 'accounting', 'New York'),
      (20, 'research', 'Dallas'),
      (30, 'sales', 'Chicago'),
      (40, 'operations', 'Boston');

-- fetch 

 
SELECT * FROM employees











-- Q1(A): Display all the information of the EMP table?
-- select * from employee
-- select * from dept

-- Q1 (B):  Display unique Jobs from EMP table?
/* SELECT DISTINCT JOB AS UNIQUE_JOBS
FROM employee*/ 

-- Q1(C): List the emps in the asc order of their Salaries
/* SELECT *
FROM employee
ORDER BY Salary */ 
-- Q1(D); List the details of the emps in asc order of the Dptnos and desc of Jobs?
/*SELECT * 
FROM employee
ORDER BY DEPTNO, JOB DESC*/
-- Q1(E): Display all the unique job groups in the descending order?
/* SELECT DISTINCT JOB 
FROM employee
ORDER BY JOB DESC*/ 

-- Q1(F): Display all the details of all ‘Mgrs’
/*SELECT * 
FROM employee
WHERE JOB = ('MANAGER')*/ 

-- Q1(G): List the emps who joined before 1981.
/*SELECT *
FROM employee
WHERE HIREDATE < '1981/01/01'*/ 

-- Q1(H) List the Empno, Ename, Sal, Daily sal of all emps in the asc order of Annsal.     -- check1 
/* SELECT EMPNO, ENAME, Salary,  Salary/30 AS DAILY_SALARY, 12*Salary AS ANNUAL_SALARY 
FROM employee
ORDER BY ANNUAL_SALARY*/

-- 2.9. Display the Empno, Ename, job, Hiredate, Exp of all Mgrs                       -- check2
/*SELECT empno, Ename, job, Hiredate, TIMESTAMPDIFF(year, Hiredate, CURRENT_DATE) as YOE
FROM employee
WHERE JOB = ('MANAGER')*/ 

-- 2.10. List the Empno, Ename, Sal, Exp of all emps working for Mgr 7698.
/*SELECT Empno, Ename, Salary, TIMESTAMPDIFF(year, Hiredate, CURRENT_DATE) as YOE
FROM employee
WHERE MGR = (7698)*/ 

-- 2.11. Display all the details of the emps whose Comm. Is more than their Sal.
/*SELECT * 
FROM employee
WHERE COMM > Salary*/ 

-- 2.12: List the emps in the asc order of Designations of those joined after the second half of 1981

/*SELECT *
FROM employee
WHERE HIREDATE   > '1981/06/30' 
ORDER BY JOB*/ 
-- List the emps along with their Exp and Daily Sal is more than Rs.100. 
/*SELECT * 
FROM employee
WHERE Salary/30 > 100*/ 

-- 2.14. List the emps who are either ‘CLERK’ or ‘ANALYST’ in the Desc order

/*SELECT * 
FROM employee
WHERE JOB IN ('CLERK', 'ANALYST')
ORDER BY JOB DESC*/ 

-- 2.15. List the emps who joined on 1-MAY-81,3-DEC-81,17-DEC-81,19-JAN80 in asc order of seniority.
/*SELECT * 
FROM employee
WHERE HIREDATE IN ('1981/05/01', '1981/12/03', '1981/12/17', '1980/01/19') 
ORDER BY HIREDATE*/ 

-- 2.16. List the emp who are working for the Deptno 10 or20
/*SELECT *
FROM employee
WHERE DEPTNO IN (10,20)*/ 

-- 2.17. List the emps who are joined in the year 81.                                    -- CHECK3 
/*SELECT *
FROM employee
WHERE  EXTRACT(YEAR FROM HIREDATE) = 1981*/  
-- 2.18. List the emps who are joined in the month of Aug 1980.
/*SELECT * 
FROM employee
WHERE EXTRACT(YEAR FROM HIREDATE) = 1980 AND EXTRACT(MONTH FROM HIREDATE) = 08*/ 

/* SELECT * 
FROM employee
WHERE HIREDATE  BETWEEN ('1980/08/01') AND ('1980/08/31')*/ 

-- 2.19. List the emps Who Annual sal ranging from 22000 and 45000.
/* SELECT * 
FROM employee
WHERE Salary*12 BETWEEN 22000 AND 45000*/ 

-- 2.20. List the Enames those are having five characters in their Names.
/*SELECT * 
FROM employee
WHERE LENGTH(ENAME) = 5*/ 

-- 2.21. List the Enames those are starting with ‘S’ and with five characters.
/*SELECT * 
FROM employee
WHERE ENAME LIKE ('S%') AND LENGTH(ENAME) = 5*/ 

-- 2.22. List the emps those are having four chars and third character must be ‘r’.
/*SELECT * 
FROM employee
WHERE ENAME LIKE ('__R_')*/ 

-- 2.23. List the Five character names starting with ‘S’ and ending with ‘H’.

/*SELECT * 
FROM employee
WHERE ENAME LIKE ('S%H') AND LENGTH(ENAME) = 5*/ 

-- 2.24. List the emps who joined in January
/*SELECT * 
FROM employee
WHERE EXTRACT(MONTH FROM HIREDATE) = 01*/ 
 
-- 2.25. List the emps who joined in the month of which second character is ‘a’.                          --CHECK 4 
/* WITH CTE AS 
(
SELECT *,
    CASE 
        WHEN EXTRACT(MONTH FROM HIREDATE) = 1 THEN 'JAN'
        WHEN EXTRACT(MONTH FROM HIREDATE) = 2 THEN 'FEB'
        WHEN EXTRACT(MONTH FROM HIREDATE) = 3 THEN 'MAR'
        WHEN EXTRACT(MONTH FROM HIREDATE) = 4 THEN 'APR'
        WHEN EXTRACT(MONTH FROM HIREDATE) = 5 THEN 'MAY'
        WHEN EXTRACT(MONTH FROM HIREDATE) = 6 THEN 'JUN'
        WHEN EXTRACT(MONTH FROM HIREDATE) = 7 THEN 'JUL'
        WHEN EXTRACT(MONTH FROM HIREDATE) = 8 THEN 'AUG'
        WHEN EXTRACT(MONTH FROM HIREDATE) = 9 THEN 'SEP'
        WHEN EXTRACT(MONTH FROM HIREDATE) = 10 THEN 'OCT'
        WHEN EXTRACT(MONTH FROM HIREDATE) = 11 THEN 'NOV'
        WHEN EXTRACT(MONTH FROM HIREDATE) = 12 THEN 'DEC'
    END AS MONTH_JOINED
FROM employee
) 
SELECT * 
FROM CTE 
WHERE MONTH_JOINED LIKE ('_A_')*/ 

-- ANOTHER WAY OF WRITING CASE STATEMENT 
/* SELECT *,
    CASE EXTRACT(MONTH FROM HIREDATE)
        WHEN 1 THEN 'JAN'
        WHEN 2 THEN 'FEB'
        WHEN 3 THEN 'MAR'
        WHEN 4 THEN 'APR'
        WHEN 5 THEN 'MAY'
        WHEN 6 THEN 'JUN'
        WHEN 7 THEN 'JUL'
        WHEN 8 THEN 'AUG'
        WHEN 9 THEN 'SEP'
        WHEN 10 THEN 'OCT'
        WHEN 11 THEN 'NOV'
        WHEN 12 THEN 'DEC'
    END AS MONTH_JOINED
FROM employee*/ 

-- 2.26. List the emps whose Sal is four digit number ending with Zero.
/* SELECT * 
FROM employee
WHERE SALARY LIKE ('___0')*/ 

-- 2.27. List the emps whose names having a character set ‘ll’ together.    -- %: for matching zero or more characters. 
/* SELECT * 
FROM employee
WHERE ENAME  LIKE ('%LL%')*/ 

-- 2.28. List the emps those who joined in 80’s.
/* SELECT * 
FROM employee
WHERE EXTRACT(YEAR FROM HIREDATE) = 1980*/ 

-- 2.29. List the emps who does not belong to Deptno 20
/*SELECT *
FROM employee
WHERE DEPTNO NOT IN  (20)*/ 

-- 2.30. List all the emps except ‘PRESIDENT’ & ‘MGR” in asc order of Salaries.
/*SELECT * 
FROM employee
WHERE JOB NOT IN ('PRESIDENT', 'MANAGER')
ORDER BY Salary*/ 

-- 2.31. List all the emps who joined before or after 1981.
/*SELECT *
FROM employee
WHERE EXTRACT(YEAR FROM HIREDATE) NOT IN (1981)*/ 

-- 2.32. List the emps whose Empno not starting with digit78.
/*SELECT * 
FROM employee
WHERE EMPNO NOT LIKE ('78%')*/

-- 2.33. List the emps who are working under ‘MGR’.
/*SELECT CONCAT(E1.ENAME, ' HAS A EMP ', E2.ENAME)
FROM employee AS E1
JOIN employee AS E2 ON E1.MGR = E2.EMPNO*/

-- 2.34. List the emps who joined in any year but not belongs to the month of March.

/*SELECT *
FROM employee
WHERE EXTRACT(MONTH FROM HIREDATE) NOT IN (03)*/ 

-- 2.35. List all the Clerks of Deptno 20.
/*SELECT *
FROM employee
WHERE DEPTNO = 20  AND JOB = 'CLERK'*/ 

-- 2.36. List the emps of Deptno 30 or 10 joined in the year 1981
/*SELECT * 
FROM employee
WHERE DEPTNO IN (30, 10) AND EXTRACT(YEAR FROM HIREDATE) IN (1981)*/ 

-- 2.37. Display the details of SMITH
/*SELECT * 
FROM employee
WHERE ENAME IN ('SMITH')*/ 

-- START OF JOIN 
-- 2.38. Display the location of SMITH.
/*SELECT E.ENAME, D.Location
FROM employee AS E
JOIN dept AS D ON E.DEPTNO = D.DEPTNO
WHERE E.ENAME IN ('SMITH')*/ 

-- 2.39. List the total information of EMP table along with DNAME and Loc of
-- all the emps Working Under ‘ACCOUNTING’ & ‘RESEARCH’ in the asc Deptno.
/* SELECT E.EMPNO, E.ENAME, D.DNAME, D.Location, D.DEPTNO
FROM employee AS E 
JOIN dept AS D ON E.DEPTNO = D.DEPTNO
WHERE D.DNAME IN ('accounting', 'research')
ORDER BY E.DEPTNO*/ 

-- 2.40. List the Empno, Ename, Sal, Dname of all the ‘MGRS’ and ‘RESEARCH’
-- working in New York, Dallas with an exp more than 7 years without receiving
-- the Comm asc order of Loc.
/* SELECT E.Empno, E.Ename, E.Salary, D.DNAME,D.Location, E.Comm, E.HIREDATE, TIMESTAMPDIFF(YEAR, E.HIREDATE, CURRENT_DATE) AS YOE
FROM employee AS E 
JOIN dept AS D ON E.DEPTNO = D.DEPTNO
WHERE E.JOB = 'MANAGER' AND D.DNAME = 'RESEARCH' 
AND D.Location IN ('New York', 'Dallas')
AND E.Comm IS NULL 
AND TIMESTAMPDIFF(YEAR, E.HIREDATE, CURRENT_DATE) > 7
ORDER BY D.Location*/ 

-- 2.41. Display the Empno, Ename, Sal, Dname, Loc, Deptno, Job of all emps
-- working at CJICAGO or working for ACCOUNTING dept with Ann Sal>28000, 
-- but the Sal should not be=3000 or 2800 who doesn’t belongs to the
-- Mgr and whose no is having a digit ‘7’ or ‘8’ in 3rd position in the asc order of
-- Deptno and desc order of job.

created 11 months ago by Sucharita Singh

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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;