Query Question

SELECT c.name, w.ib, c.vbp, c.year_balance
FROM clients c
LEFT JOIN workers w ON (w.client_id = c.id)
;

Will do the trick.

BTW, I suggest not using 'bareword' id's for field names. It's very easy
to get confused with larger queries. So instead of clients.id, do
clients.client_id. I do the same thing with name, since it's also a very
common field name, so instead of clients.name, clients.client_name.

Also, most people don't use pluralized table names. I'm guessing you're
using Ruby on Rails here...

On Tue, Sep 27, 2005 at 12:20:05PM +0200, Frodo Larik wrote:

Hi All,

I have the following simplified setup. A client has 2 products: 'vbp'
and 'year_balance', but a client has also workers who have a product,
named 'ib'. A client can have multiple workers.

-- clients
CREATE TABLE clients (
id serial NOT NULL PRIMARY KEY,
name text NOT NULL,
vbp boolean DEFAULT 'f'::bool NOT NULL, -- product 'vbp'
year_balance boolean DEFAULT 'f'::bool NOT NULL -- product
'year_balance'
);

-- workers
CREATE TABLE workers (
id serial NOT NULL PRIMARY KEY,
client_id integer NOT NULL REFERENCES clients(id),
ib boolean DEFAULT 'f'::bool NOT NULL -- product 'ib'
);

There one thing I like to know. What products are active for a client
(clients.id) or for all clients:
I don't know what query I can use to accomplish this, but I know I would
like to have results like this

SELECT <<some_query_magic>>

clients.name | workers.ib | clients.vbp | clients.year_balance
----------------+--------------+--------------+-------------------------
client a | t | f | f
client b | f | t | t

It is possible that a client has zero or more workers, I want to know if
one of the workers has workers.ib = 't' set if this is true I like to
have 't' returned else a 'f'

Is this possible in a single query?

Sincerely,

Frodo Larik

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