custom customer attribute save in which tables in magento

custom customer attribute save in tables
(1) eav_attribute
(2) customer_eav_attribute
(3) If we use checkout_register form then we use sales_flat_quote table
(4) value of attribute save in tables like
customer_entity_datetime, customer_entity_decimal, customer_entity_int, customer_entity_text, customer_entity_varchar
Note:- attributes value save in a table according to datatype
ex:- if we create attribute data type varchar then save in the customer_entity_varchar and if we create attribute data type int then save in the customer_entity_int so on.