These are the essential CRUD commands for MySQL.
Be careful with UPDATE and DELETE operations by using the appropriate WHERE clause to avoid unintended data changes or deletions.
CREATE
Create table
CREATE TABLE users (
id INT AUTO_INCREMENT PRIMARY KEY,
username VARCHAR(100),
email VARCHAR(100),
created_at TIMESTAMP DEFAULT CURRENT_TIMESTAMP
);
Insert data into the table
INSERT INTO users (username, email)
VALUES ('john_doe', '[email protected]');
READ
Select all data from table
SELECT username, email FROM users;
Select data with a specific condition
SELECT * FROM users WHERE username = 'john_doe';
Select data with ordering
SELECT * FROM users ORDER BY created_at DESC;
Join data from multiple tables
SELECT orders.id, users.username
FROM orders
JOIN users ON orders.user_id = users.id;
UPDATE
Update data in the table
UPDATE users
SET email = '[email protected]'
WHERE username = 'john_doe';
DELETE
Delete data from the table
DELETE FROM users
WHERE username = 'john_doe';
Delete all data from the table (use with caution!)
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