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You can use the JOIN statement to select rows from a table by referencing another table in Bash.

For example, if you have a table called "customers" and another table called "orders", and you want to select all orders placed by customers with a certain last name, you could use the following query:

SELECT orders.*
FROM orders
JOIN customers ON orders.customer_id = customers.id
WHERE customers.last_name = "Smith";

This query joins the two tables on the customer_id column, and then filters the results to only include orders placed by customers with the last name "Smith".

You can run this query using a command-line interface like MySQL or MariaDB, or you could write a Bash script to run the query and process the results.