-- create CREATE TABLE PRODUCTS ( pId INTEGER PRIMARY KEY NOT NULL, item TEXT , price MONEY ); INSERT INTO PRODUCTS VALUES(1,"PEN",1.20); INSERT INTO PRODUCTS VALUES(2,"PENCIL",2.20); INSERT INTO PRODUCTS VALUES(3,"BOOK",5.20); --alter TABLE ALTER TABLE PRODUCTS ADD cId INTEGER; --fetch again UPDATE PRODUCTS SET cId = 0001 WHERE pId = 1; UPDATE PRODUCTS SET cId = 0002 WHERE pId = 2; UPDATE PRODUCTS SET cId = 0003 WHERE pId = 3; INSERT INTO PRODUCTS VALUES(4,"","",004); --delete DELETE FROM PRODUCTS WHERE pId = 4; --fetch SELECT cId FROM PRODUCTS; SELECT item FROM PRODUCTS; --count SELECT COUNT(pId) FROM PRODUCTS; --avg SELECT AVG(price) FROM PRODUCTS; INSERT INTO PRODUCTS VALUES(4,"BOX","10.20",0004); --count SELECT COUNT(pId) FROM PRODUCTS; --Search SELECT item FROM PRODUCTS WHERE item LIKE 'P%'; CREATE TABLE CUSTOMERS( cId INTEGER PRIMARY KEY NOT NULL, product TEXT, price MONEY ); INSERT INTO CUSTOMERS (cId, product, price) SELECT cId,item,price FROM PRODUCTS; SELECT price FROM CUSTOMERS ORDER BY price DESC; -- fetch SELECT * FROM PRODUCTS; --fetch SELECT * FROM CUSTOMERS;
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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;