SQL Inner join more than two tables

Question

I can currently query the join of two tables on the equality of a foreign/primary key in the following way.

 $result = mysql_query(\"SELECT * FROM `table1` 
         


        

Answer 1

try this method given below, modify to suit your need.

SELECT
  employment_status.staff_type,
  COUNT(monthly_pay_register.age),
  monthly_pay_register.BASIC_SALARY,
  monthly_pay_register.TOTAL_MONTHLY_ALLOWANCES,
  monthly_pay_register.MONTHLY_GROSS,
  monthly_pay_register.TOTAL_MONTHLY_DEDUCTIONS,
  monthly_pay_register.MONTHLY_PAY
FROM 
  (monthly_pay_register INNER JOIN deduction_logs 
ON
  monthly_pay_register.employee_info_employee_no = deduction_logs.employee_no)
INNER JOIN
  employment_status ON deduction_logs.employee_no = employment_status.employee_no
WHERE
  monthly_pay_register.`YEAR`=2017
and 
  monthly_pay_register.`MONTH`='may'