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SIGHUP 1 Hangup
SIGINT 2 Interrupt from keyboard
SIGKILL 9 Kill signal
SIGTERM 15 Termination signal
SIGSTOP 17,19,23 Stop the process
SELECT employees.Lastname, employees.Firstname, invoices.Sale, invoices.Price
FROM employees
INNER JOIN invoices
ON employees.id = invoices.EmployeeID