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Essential SQL
This site is all about learning SQL Server. My goal is to help you unders..
Essential SQL by Kris Wenzel - 1M ago
In this puzzle, we’re going to work through a problem to identify the top and bottom 25 percent to rank student scores. Solving puzzles ..read more

In this video we’ll walk you though how to select top rows within a query.   We’ll show you how to retrieve the top or bottom rows in ..read more
In this puzzle, we’re going to learn how to calculate moving averages by working through a hypothetical stock market example. Solving ..read more
You can use the SQL UPDATE statement to update multiple columns. The trick is to specify the columns you wish to update in the SET clause ..read more
Essential SQL by Ellie Cloverdale - 4M ago

In learning any kind of language, as a beginner you make mistakes. But that’s how we learn. When learning SQL, the same process applies ..read more
I recently put together a lesson on why we need SQL stored procedures.  It is part of my Stored Procedures Unpacked course.  SQL Stored ..read more
As the word “Restore” suggests, this Microsoft SQL server error 3154 is associated with SQL Backup.  Even though SQL Administrators ..read more

A reader recently asked about a error converting data type error they received.  Since this is a common issue, especially when numeric ..read more

Whether you are a database administrator, a programmer or an SQL specialist looking for employment, your resume will often be the decisive ..read more
I recently put together a lesson on non-equi joins.  It is part of my Join Together Now course.  Click here get the course at a discount ..read more

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