 CREATE TABLE DEPT (DEPTNO INT(2) PRIMARY KEY,DNAME VARCHAR(14),LOC VARCHAR(13));
INSERT INTO DEPT VALUES (10, 'ACCOUNTING', 'NEW YORK');
INSERT INTO DEPT VALUES (20, 'RESEARCH', 'DALLAS');
INSERT INTO DEPT VALUES (30, 'SALES', 'CHICAGO');
INSERT INTO DEPT VALUES (40, 'OPERATIONS', 'BOSTON');
CREATE TABLE EMP (EMPNO INT(4),ENAME VARCHAR(10),JOB VARCHAR(9),MGR INT(4),HIREDATE DATE,SAL INT(7),COMM INT(7),DEPTNO INT(2),FOREIGN KEY (DEPTNO) REFERENCES DEPT(DEPTNO));
INSERT INTO EMP VALUES (7369, 'SMITH', 'CLERK', 7902, '1980-12-17', 800, NULL, 20);
INSERT INTO EMP VALUES (7499, 'ALLEN', 'SALESMAN', 7698, '1981-02-20', 1600, 300, 30);
INSERT INTO EMP VALUES (7521, 'WARD', 'SALESMAN', 7698, '1981-02-22', 1250, 500, 30);
INSERT INTO EMP VALUES (7566, 'JONES', 'MANAGER', 7839, '1981-04-02', 2975, NULL, 20);
INSERT INTO EMP VALUES (7654, 'MARTIN', 'SALESMAN', 7698, '1981-09-28', 1250, 1400, 30);
INSERT INTO EMP VALUES (7698, 'BLAKE', 'MANAGER', 7839, '1981-05-01', 2850, NULL, 30);
INSERT INTO EMP VALUES (7782, 'CLARK', 'MANAGER', 7839, '1981-06-09', 2450, NULL, 10);
INSERT INTO EMP VALUES (7788, 'SCOTT', 'ANALYST', 7566, '1987-04-19', 3000, NULL, 20);
INSERT INTO EMP VALUES (7839, 'KING', 'PRESIDENT', NULL, '1981-11-17', 5000, NULL, 10);
INSERT INTO EMP VALUES (7844, 'TURNER', 'SALESMAN', 7698, '1981-09-08', 1500, 0, 30);
INSERT INTO EMP VALUES (7876, 'ADAMS', 'CLERK', 7788, '1987-05-23', 1100, NULL, 20);
INSERT INTO EMP VALUES (7900, 'JAMES', 'CLERK', 7698, '1981-12-03', 950, NULL, 30);
INSERT INTO EMP VALUES (7902, 'FORD', 'ANALYST', 7566, '1981-12-03', 3000, NULL, 20);
INSERT INTO EMP VALUES (7934, 'MILLER', 'CLERK', 7782, '1982-01-23', 1300, NULL, 10);
-- SELECT * FROM EMP;
-- SELECT COUNT(*) FROM  EMP WHERE DEPTNO=10 AND SAL<2000;
-- SELECT SUM(SAL) FROM EMP WHERE JOB='CLERK';
-- SELECT AVG(SAL) FROM EMP;
-- SELECT COUNT(*) FROM EMP WHERE ENAME LIKE 'A%';
-- SELECT COUNT(*) FROM EMP WHERE JOB='CLERK' OR JOB='MANAGER';
-- SELECT SUM(1), SAL FROM EMP GROUP BY SAL;
-- 08/11/2024
-- SELECT SUM(1),DEPTNO FROM EMP WHERE NOT JOB='PRESIDENT'GROUP BY DEPTNO;
-- SELECT SUM(SAL),JOB FROM EMP GROUP BY JOB;
-- SELECT SUM(1), DEPTNO FROM EMP WHERE JOB='MANAGER' GROUP BY DEPTNO;
-- SELECT AVG(SAL),DEPTNO FROM EMP WHERE NOT DEPTNO=20 GROUP BY DEPTNO;
-- SELECT SUM(1),JOB FROM EMP WHERE ENAME LIKE 'A%A' GROUP BY JOB;
-- SELECT SUM(1),AVG(SAL),DEPTNO FROM EMP WHERE SAL>2000 GROUP BY DEPTNO;
-- SELECT SUM(SAL),DEPTNO FROM EMP WHERE JOB='SALESMAN' GROUP BY DEPTNO;
-- SELECT SUM(1),MAX(SAL),JOB FROM EMP GROUP BY JOB;
-- SELECT MAX(SAL),DEPTNO FROM EMP GROUP BY DEPTNO;
-- SELECT COUNT(*) FROM OF EMP;
-- SELECT ENAME FROM EMP WHERE SAL>(SELECT SAL FROM EMP WHERE ENAME='ALLEN');
-- SELECT ENAME FROM EMP WHERE SAL>(SELECT SAL FROM EMP WHERE ENAME='BLAKE');
-- SELECT * FROM EMP WHERE (SAL>1000) AND (SAL<(SELECT SAL FROM EMP WHERE ENAME='KING'
-- SELECT ENAME FROM EMP WHERE SAL >(SELECT SAL FROM EMP WHERE ENAME='ADAMS');
-- SELECT ENAME ,SAL FROM EMP WHERE SAL<(SELECT SAL FROM EMP WHERE ENAME='KING');
-- SELECT ENAME ,DEPTNO FROM EMP WHERE JOB = (SELECT JOB FROM EMP WHERE ENAME='JONES');
-- SELECT ENAME, JOB FROM EMP WHERE JOB=(SELECT JOB FROM EMP WHERE ENAME='JAMES');
-- SELECT EMPNO,ENAME,SAL*12 FROM EMP WHERE (SAL*12)>(SELECT SAL*12 FROM EMP WHERE ENAME='WARDS');
-- SELECT * FROM EMP;
-- SELECT * FROM DEPT;
-- SELECT ENAME FROM EMP WHERE SAL>(SELECT SAL FROM EMP WHERE ENAME='ADAMS');
-- SELECT ENAME ,SAL FROM EMP WHERE SAL<(SELECT SAL FROM EMP WHERE ENAME='KING');
-- SELECT ENAME,DEPTNO,JOB FROM EMP WHERE JOB=(SELECT JOB FROM EMP WHERE ENAME='JONES');
-- SELECT ENAME,JOB FROM EMP WHERE JOB=(SELECT JOB FROM EMP WHERE ENAME='JAMES');
-- SELECT EMPNO,ENAME,SAL*12 FROM EMP WHERE SAL*12>(SELECT SAL*12 FROM EMP WHERE ENAME='WARDS');
-- SELECT ENAME,HIREDATE FROM EMP WHERE HIREDATE<(SELECT HIREDATE FROM EMP WHERE ENAME='SCOTT')
-- SELECT DNAME FROM DEPT WHERE DEPTNO=(SELECT DEPTNO FROM EMP WHERE ENAME='SMITH');
-- SELECT DNAME,LOC FROM DEPT WHERE DEPTNO=(SELECT DEPTNO FROM EMP WHERE ENAME='KING');
-- SELECT LOC FROM DEPT WHERE DEPTNO=(SELECT DEPTNO FROM EMP WHERE EMPNO=7902);
-- SELECT DNAME ,LOC,DEPTNO FROM DEPT WHERE DEPTNO IN (SELECT DEPTNO FROM EMP WHERE ENAME LIKE '%R');
-- SELECT DNAME FROM DEPT WHERE DEPTNO=(SELECT DEPTNO FROM EMP WHERE JOB='PRESIDENT');
-- SELECT ENAME FROM EMP WHERE DEPTNO=(SELECT DEPTNO FROM DEPT WHERE DNAME='ACCOUNTING');
-- SELECT ENAME,SAL FROM EMP WHERE DEPTNO=(SELECT DEPTNO FROM DEPT WHERE LOC='CHICAGO');
-- SELECT MAX(SAL),DEPTNO FROM EMP GROUP BY DEPTNO HAVING DEPTNO=20;
-- WAQTD ENAME AND DNAME OF THE EMP WHO ARE WORKING IN DEPT 10
-- SELECT * FROM EMP;
-- SELECT * FROM DEPT;
-- SELECT ENAME FROM EMP WHERE SAL IN (SELECT SAL FROM EMP WHERE ENAME='FORD');
-- SELECT ENAME FROM EMP WHERE SAL = (SELECT MIN(SAL) FROM EMP););
-- SELECT ENAME,HIREDATE FROM EMP WHERE HIREDATE IN (SELECT MAX(HIREDATE) FROM EMP
-- SELECT * FROM EMP;
-- SELECT * FROM DEPT;
-- SELECT ENAME FROM EMP WHERE EMPNO IN(SELECT MGR FROM EMP WHERE ENAME='SCOTT');
-- SELECT * FROM DEPT WHERE DEPTNO = (SELECT DEPTNO FROM EMP WHERE ENAME='BLAKE');
-- SELECT ENAME FROM EMP WHERE MGR IN(SELECT EMPNO FROM EMP WHERE DEPTNO IN (SELECT DEPTNO FROM DEPT WHERE LOC='NEW YORK'));
-- CROSS JOIN
-- SELECT ENAME,DNAME FROM EMP,DEPT;
-- SELECT ENAME,DNAME FROM EMP CROSS JOIN DEPT
-- INNER JOIN
-- SELECT * FROM EMP,DEPT WHERE EMP.DEPTNO=DEPT.DEPTNO;
-- SELECT * FROM EMP INNER JOIN DEPT WHERE EMP.DEPTNO=DEPT.DEPTNO;
-- SELECT ENAME,DNAME,LOC FROM EMP, DEPT WHERE SAL>1000 AND EMP.DEPTNO=DEPT.DEPTNO;
-- SELECT ENAME,DNAME,LOC FROM EMP INNER JOIN DEPT WHERE (SAL>1000 AND EMP.DEPTNO=DEPT.DEPTNO);
-- SELECT ENAME,DNAME FROM EMP INNER JOIN DEPT WHERE SAL>(SELECT SAL FROM EMP WHERE ENAME='ALLEN') AND EMP.DEPTNO = DEPT.DEPTNO;
-- SELECT * FROM EMP;
-- SELECT * FROM EMP E1 WHERE(SELECT COUNT(DISTINCT E2.SAL) FROM EMP E2 WHERE E1.SAL>E2.SAL)=3;
-- SELECT * FROM EMP E1 WHERE(SELECT COUNT(DISTINCT E2.HIREDATE) FROM EMP E2 WHERE E1.HIREDATE>E2.HIREDATE)=2;

-- SELECT * FROM EMP;
-- SELECT * FROM DEPT;
-- SELECT * FROM EMP WHERE SAL>3000;
-- SELECT *,((SAL*12)+((SAL*12)*35/100)) FROM EMP ;
-- SELECT ENAME, HIREDATE FROM EMP WHERE HIREDATE LIKE '_%03%_';
-- SELECT * FROM EMP WHERE ENAME LIKE '______%';
-- SELECT SUM(1) FROM EMP WHERE DEPTNO=20 OR DEPTNO=30;

-- SELECT ENAME FROM EMP WHERE SAL > ANY(SELECT SAL FROM EMP WHERE DEPTNO = 20);
-- ----
-- SELECT * FROM EMP WHERE SAL IN (SELECT SAL FROM EMP GROUP BY SAL HAVING SUM(1) > 1);
-- -- 
-- SELECT DEPTNO, ENAME, HIREDATE FROM EMP WHERE HIREDATE = (SELECT MIN(HIREDATE) FROM EMP) OR HIREDATE = (SELECT MAX(HIREDATE) FROM EMP);
-- SELECT ENAME  FROM EMP WHERE SAL>2000 AND SAL<6000;
-- SELECT * FROM EMP CROSS JOIN DEPT;
-- SELECT * FROM EMP INNER JOIN DEPT WHERE EMP.DEPTNO=DEPT.DEPTNO;
-- SELECT * FROM EMP LEFT JOIN DEPT ON WHERE EMP.DEPTNO=DEPT.DEPTNO;
-- SELECT * FROM EMP;
-- SELECT * 
-- FROM (SELECT * FROM EMP LIMIT 4 OFFSET 3) AS EMP_SUB LIMIT 1;


select * from emp;

select * from dept;

created 11 months ago by crisna vamshi

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;