I second Jared's opinion. Ralph's books are clear and easy to read. This is
the fundamentals of data warehousing.
Dennis Williams
DBA
Lifetouch, Inc.
[EMAIL PROTECTED]
-----Original Message-----
Sent: Tuesday, May 21, 2002 2:30 PM
To: Multiple recipients of list ORACLE-L
Yup, $60, and worth every penny.
It may be 4 years old, but the information is still pertinent.
Jared
Joe Testa <[EMAIL PROTECTED]>
Sent by: [EMAIL PROTECTED]
05/20/2002 05:53 PM
Please respond to ORACLE-L
To: Multiple recipients of list ORACLE-L <[EMAIL PROTECTED]>
cc:
Subject: Re: Data Warehouse experts, a simple question for
you
looks like published aug of 98 for that book?, like $60?
joe
[EMAIL PROTECTED] wrote:
>Joe,
>
>Add a generated PK to the time dimension. The PK is stored
>as an FK in the fact table.
>
>That way you can select from the time dimension by year, day, qtr,
>whatever,
>and easily pick out the correct fact table rows.
>
>"The Data Warehouse Lifecycle Toolkit" includes a spreadsheet to generate
>the DDL/DML for a very robust time dimension. I think it has about 20
>columns.
>
>Very good book, can't recommend it enough.
>
>Jared
>
>
>
>
>
>
>Joe Testa <[EMAIL PROTECTED]>
>Sent by: [EMAIL PROTECTED]
>05/20/2002 04:08 PM
>Please respond to ORACLE-L
>
>
> To: Multiple recipients of list ORACLE-L
<[EMAIL PROTECTED]>
> cc:
> Subject: Data Warehouse experts, a simple question for you
>
>
>Ok i'm messing with dimensions.
>
>dm_time to be exact:
>
>create table dm_time
>( calendar_date date not null,
> calendar_month number(2) not null,
> calendar_qtr number(1) not null,
> calendar_year number(4) not null);
>
>insert into dm_time values(to_date('20020101','YYYYMMDD'), 1,1,2002);
>insert into dm_time values(to_date('20030101','YYYYMMDD'), 1,1,2003);
>
> 2 rows nice and simple
>
> trying to validate the dimension comes up with an error, my guess is
>because of the design of the table
>
> where basically calendar_date is child of
> calendar_month is child of calendar_qtr is child of calendar_year,
>wont validate.
>
>- the question i have is this, should month really be like 2002-01 with
>the year included, likewise with qtr, then it
>will validate ok.
>
>Was the design of dm_time just dont wrong or am i missing something here.
>
>thanks, joe
>
>
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