Sql Tutorial Development Tutorials, Guides & Insights

If you need to remove tables entirely from your database, you can use the DROP TABLE command. This will remove the table structure and data permanently.

Command to Drop a Table:

• Basic knowledge of MySQL and SQL operations.
• Access to a MySQL server.
• Familiarity with command-line tools and basic server administration.

mysqldump is a powerful command-line tool used to create logical backups of a MySQL database. It generates SQL statements to recreate the database schema and populate it with data.

Avoid SELECT *:

SELECT name, department FROM employees;

Result:

SELECT sale_id, employee_id, amount,
       LEAD(amount, 1) OVER (ORDER BY sale_id) AS next_sale
FROM sales;

The INNER JOIN is used to retrieve rows with matching values in both tables.

SELECT columns
FROM table1
INNER JOIN table2
ON table1.common_column = table2.common_column;