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Ronald Kraijesteijn

Microsoft SQL Server and Business Intelligence consultant, MCITP Certified. If you need a BI specialist for a freelance job, please contact me!

Data Warehouse – Waarom heb je er een nodig?

Waarom heb je een data warehouse nodig

Het woord “Data Warehouse” klinkt behoorlijk spannend! Het doet vermoeden dat het een ingewikkeld gebeuren is, een soort pakhuis of verzameling met data. Eigenlijk is een data warehouse een database net als alle andere “gewone databases”. Men noemt het een “warehouse” omdat je er meer in bewaart dan in een …

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Linked Server – Why and how use them!

A linked server is used to connect to another (remote) database or file (Xls, CVX) using SQL Server Management Studio (SSMS) and discover the data or objects. You can write SQL queries from your SSMS directly on a database on another machine. In Oracle they call it DBLinks (Database Links).

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Calculate Age in SQL Server

In my daily work, I need to calculate and report the age of people very often. There are a couple of ways to calculate the age and will give you the right result. I do not recommend a SQL Function to to this. SQL Functions are performing very slow, especially …

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Calculate Lost Customers using T-SQL

Calculate Lost Customers in SQL

A common question in the Business Intelligence world from customers is “how many customers did we lose this year” ? Businesses wants to know this so they can act faster to keep customers doing business with them. In this article, I will help you to create SQL to calculate this …

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How To Find the slowest SQL Queries

Slowest_SQL_Queries

This stored procedure displays the top worst performing queries based on CPU, Execution Count, I/O and Elapsed_Time as identified using DMV information.  This can be display the worst performing queries from an instance, or database perspective.   The number of records shown, the database, and the sort order are identified by …

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Interesting Course about data visualisation from Google

Making Sense of Data   Do you work with surveys, demographic information, evaluation data, test scores, or observation data? Are you interested in making the data you collect more useful by organizing it, analyzing it, and applying it in different ways? This self-paced, online course is intended for anyone who …

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