And politics.
--- [EMAIL PROTECTED] wrote: > Ian, > > Good question. I think that I've seen more recenct > references in articles > that state the current thinking of DW/DM. I'm sure > that I've seen Inmon > refer to them that way, or maybe it was Richard > Winter? > > Anyway, I guess that part is a bit dated. There is > so much good > information > in that book though, that it's still worth its > weight in gold. You won't > find too many > publications for $60 that will take you step by step > through building an > entire > data warehouse, including the infrastructure. > > Jared > > > > > > > "MacGregor, Ian A." <[EMAIL PROTECTED]> > Sent by: [EMAIL PROTECTED] > 05/21/2002 05:48 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 a simple question for you| Outdated? > > > I am new to his books, three chapters in. The first > release of the "Data > Warehouse Toolkit" defines a data warehouse much as > a data mart is today. > Today we think of a data warehouse as having a > highly normalized > structure which stores information from various > sources. We build data > marts with structures optimized for querying; e.g., > star schemas, from the > warehouse. Kimball writes of the warehouse itself > being based on a star > schema. > > The term data warehouse has not been immutable over > the years. It was > probably defined exactly as he has done when the > book was first written. > Do his new books redefine "data warehouse"? > > Ian MacGregor > Stanford Linear Accelerator Center > [EMAIL PROTECTED] > > -----Original Message----- > Sent: Tuesday, May 21, 2002 2:16 PM > To: Multiple recipients of list ORACLE-L > > > 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 > > > > > > > -- > Please see the official ORACLE-L FAQ: > http://www.orafaq.com > -- > === message truncated === __________________________________________________ Do You Yahoo!? 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