Re: if row has property X, find all rows that has property X

On Tue, Jun 24, 2014 at 8:40 AM, David G Johnston
<david(dot)g(dot)johnston(at)gmail(dot)com> wrote:
> Дмитрий Голубь wrote
>> For example I have table addresses and usually I want 2 things:
>> 1. Find id of bad addresses.
>> 2. Check if this address is good or bad.
>>
>> For this I write two plpgsql functions
>> 1. find_all_bad_addresses
>> 2. is_bad_address(id)
>>
>> These functions will duplicate logic of each other. How to not repeat
>> myself?
>
> You can call other functions while inside a function......
>
> CREATE FUNCTION do_a() ... $$ do_something; $$
> CREATE FUNCTION do_b() ... $$ do_a(); $$

I'd consider making 'bad address' a view:

CREATE VIEW bad_address AS
SELECT * FROM Property
WHERE ...

Then just reference that in relevant code.

merlin