I have the following tables (mucho simplified):
usrs{
serial usr_id,
var(54) username);
addrs(
serial addr_id,
var(54) addr};
usr_addr_type(
serial usr_addr_type_id,
var(16) type -- one of which is 'primary'};
usr_addrs{
int4 usr_id, --FK to usrs table
int4 addr_id, -- FK to addrs table
int4 usr_addr_type_id -- FK to usr_addr_type table);
================================
My problem: The usrs can have as many addresses as there are types. The
addresses are also used for 'org_addrs' in combination with 'org_addr_types'.
(This explains the 'usr_addrs' table)
I want to EFFECTIVELY do a unique index on:
'usrs.username' their 'primary' address in usr_addrs'. How would I have many
addresses in 'usr_addrs' for a particular address, but one of them used for
uniqueness of the of the 'usr'
?
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