How do you link the tables in sql?

Answer 1

Depending on the DBMS you're using, you link the tables by listing them both in your query, then telling the DBMS how they relate.

For example, in the (semi-)standard SQL language, you might search for customers and all their orders, linking them via a common field, such as customer id.

SELECT customer_id, customer_name, order_id, order_date

FROM customers

JOIN orders ON customers.customer_id = orders.order_id