create table students (adno int primary key,name varchar(30), class int, section char(1),fees int,house); insert into students values (111,"Anu Jain",12,"A",2500,"Agni House"); insert into students values (222,"Mohit Sharma",11,"B",4500,"Vayu House"); select * from students; insert into students values (333,"K.P.Gupta",12,"B",3000,"Jal House"); insert into students values (444,"Ajit Kumar",10,"A",2000,"Bhoomi House"); insert into students values (555,"Nandini",12,"C",3000,"Agni House"); insert into students values (666,"Rohan Sharma",11,"B",2500,"Agni House"); select * from students; SELECT adno, name, class, section, house from students; SELECT * FROM STUDENTS WHERE CLASS = 12; SELECT * FROM STUDENTS WHERE SECTION = "B"; SELECT * FROM STUDENTS WHERE SECTION = "B"; select * from students where class = 11 and section = "B"; select adno, name as STUDENT_Name from students; select name, fees *12 from students; select name, fees *6 from students; select name, fees *12 as Annual_Fees from students; select distinct class from students; select adno,name from students; select adno,name as "Student Name" from students; select * from students; select name from students where class = 11; select distinct class from students; select * from students where not class = 12; select * from students; select * from students where fees>= 2500 and fees <= 4000; select * from students where section = "A" or section = "B"; select * from students where section not in ("A","B"); select * from students; select * from students order by name; select * from students order by class;
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MySQL is a open-source, free and very popular relational database management system which is developed, distributed and supported by Oracle corporation.
CREATE TABLE table_name (
column1 datatype,
column2 datatype,
....);
CREATE TABLE EMPLOYEE (
empId INTEGER PRIMARY KEY,
name TEXT NOT NULL,
dept TEXT NOT NULL
);
ALTER TABLE Table_name ADD column_name datatype;
INSERT INTO EMPLOYEE VALUES (0001, 'Dave', 'Sales');
TRUNCATE table table_name;
DROP TABLE table_name;
RENAME TABLE table_name1 to new_table_name1;
--Line1;
/* Line1,
Line2 */
INSERT INTO table_name (column1, column2, column3, ...) VALUES (value1, value2, value3, ...);
Note: Column names are optional.
INSERT INTO EMPLOYEE VALUES (0001, 'Ava', 'Sales');
SELECT column1, column2, ...
FROM table_name
[where condition];
SELECT * FROM EMPLOYEE where dept ='sales';
UPDATE table_name
SET column1 = value1, column2 = value2, ...
WHERE condition;
UPDATE EMPLOYEE SET dept = 'Sales' WHERE empId='0001';
DELETE FROM table_name where condition;
DELETE from EMPLOYEE where empId='0001';
CREATE INDEX index_name on table_name(column_name);
CREATE UNIQUE INDEX index_name on table_name(column_name);
DROP INDEX index_name ON table_name;
Creating a View:
CREATE VIEW View_name AS
Query;
SELECT * FROM View_name;
ALTER View View_name AS
Query;
DROP VIEW View_name;
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 } */
DROP TRIGGER [IF EXISTS] trigger_name;
CREATE PROCEDURE sp_name(p1 datatype)
BEGIN
/*Stored procedure code*/
END;
CALL sp_name;
DROP PROCEDURE sp_name;
SELECT * FROM TABLE1 INNER JOIN TABLE2 where condition;
SELECT * FROM TABLE1 LEFT JOIN TABLE2 ON condition;
SELECT * FROM TABLE1 RIGHT JOIN TABLE2 ON condition;
SELECT select_list from TABLE1 CROSS JOIN TABLE2;