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  • SSIS: living in a parallel world? Not yet...

    Today I come into a nice bug (misfeature?) of SSIS 2008 and I'd like to share it with you. Let's start from the beginning: One of the keys to make something speedy is to parallelize it. In TableDifference I read from two inputs, compare them and produce several outputs for new, deleted, updated rows and so on. It is the classical ...
    Posted to Alberto Ferrari (Weblog) by AlbertoFerrari on September 14, 2008
  • Visio and SQL Extended Properties: a tool to marry them

    Visio database models have column descriptions, SQL Server has extended properties where to store them but, even if they share the same producer, it seems that Visio is unable to store column descriptions in extended properties so that other tools can gather the same information easily and produce a decent documentation of a database. After some ...
    Posted to Alberto Ferrari (Weblog) by AlbertoFerrari on November 7, 2007
  • SQL: Merge two "history tracking" tables

    If you have two columns in a table that ''remember'' their old values in two different historical tables, as it is the case in AdventureWorks with EmployeePayHistory and EmployeeDepartmentHistory, you may need (or just wonder how) to merge these two tables into only one historical table that will keep track of both columns. This has ...
    Posted to Alberto Ferrari (Weblog) by AlbertoFerrari on October 15, 2007
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