MySQL: Cách tạo BẢNG

#sql #MySQL #table

00:00:00 Intro

00:00:36 CREATE TABLE

00:03:00 SELECT * FROM TABLE

00:03:21 RENAME TABLE

00:03:54 DROP TABLE

00:04:11 Add a column

00:05:13 Rename a column

00:05:50 Modify a column

00:06:34 Change column position AFTER

00:07:32 Change column position FIRST

00:07:52 Drop a column

00:08:09 Conclusion

CREATE TABLE employees (

employee_id int PRIMARY KEY,

first_name VARCHAR(50),

last_name VARCHAR(50),

hourly_pay DECIMAL(5, 2),

hire_date DATE

);

RENAME TABLE employees TO workers;

DROP TABLE employees;

ALTER TABLE employees

ADD phone_number VARCHAR(15);

ALTER TABLE employees

RENAME COLUMN phone_number TO email;

ALTER TABLE employees

MODIFY COLUMN email VARCHAR(15);

ALTER TABLE employees

MODIFY email VARCHAR(100)

AFTER last_name;

ALTER TABLE employees

MODIFY email VARCHAR(100)

FIRST;

ALTER TABLE employees

DROP COLUMN email;