| From: | "Mark Woodward" <pgsql(at)mohawksoft(dot)com> |
|---|---|
| To: | "Tom Lane" <tgl(at)sss(dot)pgh(dot)pa(dot)us> |
| Cc: | "Gregory Stark" <stark(at)enterprisedb(dot)com>, "Greg Sabino Mullane" <greg(at)turnstep(dot)com>, pgsql-hackers(at)postgresql(dot)org |
| Subject: | Re: Netflix Prize data |
| Date: | 2006-10-05 00:28:34 |
| Message-ID: | 21629.24.91.171.78.1160008114.squirrel@mail.mohawksoft.com |
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| Lists: | pgsql-hackers |
> "Mark Woodward" <pgsql(at)mohawksoft(dot)com> writes:
>> The rating, however, is one char 1~9. Would making it a char(1) buy
>> anything?
>
> No, that would actually hurt because of the length word for the char
> field. Even if you used the "char" type, which really is only one byte,
> you wouldn't win anything because of alignment issues. Personally I'd
> just go for three ints and a date, rather than trying to be cute with
> the rating.
Actually, the date is just days, right? I don't actualy need it too much.
So, create a small int for date and do this: smalldate =
date('1970-01-01') - rdate. And use small int for rating.
Column | Type | Modifiers
--------+----------+-----------
movie | integer |
client | integer |
day | smallint |
rating | smallint |
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