search for: alpha_id

Displaying 3 results from an estimated 3 matches for "alpha_id".

Did you mean: alpha_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...
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...
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