Displaying 3 results from an estimated 3 matches for "beta_id".
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beta_i
2010 Dec 09
2
Error in vector("integer", length) : vector size cannot be NA
Hello,
I have uploaded a csv file that looks like this:
> gc
alpha_id beta_id
1 142053 1
2 9454 1
3 295618 2
4 42691 2
5 389224 3
6 9455 3
The alpha_id contains 310660 unique values and the beta_id contains 17431
unique values. The number of rows adds up to more than 1.3 million. Now I
want to conv...
2007 Jun 21
11
one-to-one, compound primary key, naming conventions
My understanding is that, given tables Alpha and Beta that the table
which holds the 1-to-1 relation will be called Alpha_Beta (or is it
alpha_beta?). So far so good.
alpha_beta will have, lets say, two fields: alpha_id and beta_id. Seems
that it''d be a good idea for those two fields to form a compound primary
key, ensuring there are no duplicates.
However, RoR doesn''t support compound primary keys. So, does table
alpha_beta require its own id for a primary key? If so, that''s what
drives me...
2006 Jul 03
6
help!
Hi,
i''m fairly new to ruby on rails, and i know the question at hand may
seem simple at first, but i''m getting really caught up in trying to
understand this and the docs aren''t giving me answer. i actually thought
i knew how the sql commands work (like :include, :conditions, :etc) but
obviously, i don''t.
there are three models M1, M2, M3 joined by a habtam