|Keep It Simple, Stupid|
Assigning account numbers, intuiting open and close datesby Voronich (Hermit)
|on Apr 09, 2014 at 18:24 UTC||Need Help??|
Voronich has asked for the
wisdom of the Perl Monks concerning the following question:
I was bitching a blue streak about this issue in CB and realized I needed input on this, just in case my head's not on straight.
I get 10 files a month. They generally report the ongoing state of a list of accounts, each a monthly snapshot.
For the sake of argument, let's assume I can cobble together a primary key for these files, be it an explicit account number or a string composite of fields.
I'm merging these things into one table that looks more or less as follows:
The idea is to create generic account ids (a new field that I'm generating) to correspond to each account across the 10 files as needed, based on a monthly load proccess.
So the open_date corresponds to either "the date that the account started showing up in the file" or "the open date specified in the file" (if one exists.)
Close date is as you'd figure, optimistically the 'specified close date' or, more interestingly "the last month in which the account appeared on an input file."
I'm cobbling this together now. But the rough pseudocode in my head seems a bit gross for reasons I can't quite put my finger on. It smells funny:
So basically it looks like "left outer join, test for nulls, then right outer join and test for nulls."
I was going to drive this entirely in perl, but it's starting to look like I could slap it into a series of stored procs.
What am I missing here?