Retriving Data From More Then Two Table

Baby writes "how to retrive data from four table
four tables have same column number and name
i am trying to retrive one column data from all the table
i am trying these :- to get the result

select mutual_fund.customer_id,insurance.customer_id,fixed_dep.customer_id,home_loan.customer_id from mutual_fund,insurance,fixed_dep,home_loan where (mutual_fund.customer_id=fixed_dep.customer_id and mutual_fund.customer_id=home_loan.customer_id and fixed_dep.customer_id=home_loan.customer_id) or (mutual_fund.customer_id=fixed_dep.customer_id and mutual_fund.customer_id=insurance.customer_id and fixed_dep.customer_id=insurance.customer_id) or (mutual_fund.customer_id=home_loan.customer_id and mutual_fund.customer_id=insurance.customer_id and home_loan.customer_id=insurance.customer_id) or (fixed_dep.customer_id=home_loan.customer_id and fixed_dep.customer_id=insurance.customer_id and home_loan.customer_id=insurance.customer_id)

the comparision working in the query
please help me tell me how to solve my problem"