h1dd3nsn1p3r / db-query

👌 Useful mySql commands.

✅ CREATE

CREATE TABLE `Class_C` (
`id` int(11) NOT NULL AUTO_INCREMENT,
`name` varchar(255) NOT NULL,
`age` int(10) NOT NULL,
PRIMARY KEY (`id`)
);

✅ INSERT

INSERT INTO `Class_C` (`name`, `age`) VALUES ('Anuj Subedi', 29);

✅ SELECT

SELECT * FROM `Class_C`;

SELECT * FROM `Class_C` WHERE `id` = 1;

✅ DELETE

DELETE FROM `Class_C` WHERE `id` = 1;

DELETE FROM `Class_C` WHERE `name` = 'Anuj Subedi';

✅ UPDATE

UPDATE `Class_C` SET name='John' WHERE id=2;

✅ ALTER

ALTER TABLE `Class_C` ADD `address` VARCHAR(255) NOT NULL AFTER `age`;

ALTER TABLE `Class_C` DROP `address`;

ALTER TABLE `Class_C` CHANGE `name`  `Fname` VARCHAR(255) NOT NULL;

ALTER TABLE `Class_C` MODIFY `name` VARCHAR(255) NOT NULL;

ALTER TABLE `Class_C` RENAME TO `Class_D`;

✅ DROP

DROP TABLE `Class_C`;

DROP TABLE IF EXISTS `Class_C`;

✅ TRUNCATE

TRUNCATE TABLE `Class_C`;

✅ IMPORT DATABASE

mysqldump -uUSERNAME -p DATABASE_NAME > backup.sql

✅ EXPORT DATABASE

mysql -uUSERNAME -p DATABASE_NAME < backup.sql