MySQL FROM

The MySQL FROM clause is used in a SELECT statement to specify the table or tables from which you want to retrieve data. It is a fundamental part of SQL queries and is typically the first clause in a SELECT statement.

The basic syntax of a SELECT statement with the FROM clause is as follows:

SELECT column1, column2, ...
FROM table_name;

Here’s how it works:

• column1, column2, and so on represent the columns you want to retrieve data from. You can specify one or more columns, or you can use * to select all columns.
• table_name is the name of the table from which you want to retrieve data.

Here are some examples of how to use the FROM clause in MySQL:

1. Retrieve all columns from a table named employees:

   SELECT * 
   FROM employees;

2. Retrieve only the product_name and price columns from a table named products:

   SELECT product_name, price 
   FROM products;

3. Retrieve data from multiple tables by specifying multiple table names in the FROM clause. This is often used in conjunction with JOIN clauses to combine data from different tables.

   SELECT orders.order_id, customers.customer_name
   FROM orders
   JOIN customers ON orders.customer_id = customers.customer_id;

The FROM clause is essential for identifying the source of data in your SQL query. It tells MySQL which table or tables you want to query and retrieve information from. You can use it to query a single table or multiple tables and, in combination with other clauses like WHERE, JOIN, and GROUP BY, construct complex queries to retrieve and manipulate data from your database.