yes, this could get called on quite large tables (maybe not
billions ...). The second solution looks useful - I'll try it on some
test data.
thanks both of you.
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TIP 2: Don't 'kill -9' the postmaster
Given that (type_id, group_id) is the PK of widgets it is possible to
avoid self-join:
select group_id from widgets
where type_id = A or type_id = B
group by group_id
having count(1) = 2;
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TIP 3: Have you checked our extens
danmcb wrote:
Hi
!'ve been wondering how to formulate a query to get a set of objects
out of a database, and am a bit stuck. I hope that someone here might
be able to help.
This is what the db looks like:
Table TYPES
id int primary key,
description text
Table GROUPS
id int primary key
descrip
Hi
!'ve been wondering how to formulate a query to get a set of objects
out of a database, and am a bit stuck. I hope that someone here might
be able to help.
This is what the db looks like:
Table TYPES
id int primary key,
description text
Table GROUPS
id int primary key
description text
Table
