What is Granularity?

Posted by tonyrogerson on SQL Blogcasts See other posts from SQL Blogcasts or by tonyrogerson
Published on Fri, 05 Mar 2010 15:02:00 GMT Indexed on 2010/03/11 17:21 UTC
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Data Theory

Granularity defines “the lowest level of detail”; but what is meant by “the lowest level of detail”? Consider the Transactions table below: create table Transactions ( TransactionID int not null primary key clustered, TransactionDate date not null, ClientID int not null, StockID int not null, TransactionAmount decimal ( 28 , 2 ) not null, CommissionAmount decimal ( 28 , 5 ) not null ) A Client can Trade in one or many Stocks on any date – there is no uniqueness to ClientID, Stock and TransactionDate...(read more)

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