SQL Date Handling and Data Trends - Changes for SQL Server, Access, and Oracle

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SQL Server

Here’s how to create the view that represents dates as integers:

  CREATE VIEW webalizer2 AS
    SELECT CONVERT(INT,whn-'2001-01-01') whn, pages
      FROM webalizer

TheSELECTstatements shown earlier will run unmodified.

Access

In Access, you can useInt(whn -#2001-01-01#)to extract the number of days since January 1, 2001:

  SELECT Int(whn - #2001-01-01#), pages
    FROM webalizer

Also,MOD is an infix operator used in place of%:

  SELECT whn MOD 7, AVG(pages)
    FROM webalizer2 GROUP BY whn MOD 7;

Oracle

Here’s how to create the view that represents dates as integers:

  CREATE VIEW webalizer2 AS
    SELECT whn-DATE '2001-01-01' whn, pages
      FROM webalizer;

In Oracle, the module function isMOD, so you’d need to use that rather thanwhn%7:

  SELECT MOD(whn,7), AVG(pages)
    FROM webalizer2 GROUP BY MOD(whn,7);

Please check back next week for the continuation of this article.

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This article is excerpted from chapter four of the book SQL Hacks, written by Andrew Cumming and Gordon Russell (O'Reilly, 2006; ISBN: 0596527993). Check it out today at your favorite bookstore. Buy this book now.