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Data Modeling Principles in Action
In this puzzle, we’re going to learn how to do some basic data modeling. Many of you have expressed an interest in learning more about data modeling and database design. I figure we could start with...
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Joins versus Subqueries SQL Puzzle
In this puzzle, we’re going to learn about joins versus subqueries. In many queries you can substitute joins and subqueries. Yet, since each has their strengths, it isn’t wise to do so. Once you...
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What is the difference between a subquery and inner join?
In this puzzle, we’re going to learn how to rewrite a subquery using inner joins. Knowing about a subquery versus inner join can help you with interview questions and performance issues. Though...
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Use SQL to Calculate Median Values.
In this puzzle we’re going to learn how to find the person whose birthday, among others, is in the middle. Knowing how to calculate the median value is a good skill to have. As you start to explore...
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Learn to use the Data Dictionary in SQL Server
In this puzzle, we’re going to learn how to query the data dictionary using SQL Server. Knowing how to query the data dictionary is good to know. There are many questions you can answer about your...
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What is a Dynamic Pivot Table?
In this puzzle, we’re going to learn how to create a dynamic pivot table using SQL Server. A dynamic pivot table is a great way to summarize data. And given that Business Intelligence is a hot topic,...
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Use SQL Server to Create a Cross Tab Query
In this puzzle, we’re going to learn how to create a cross tab query using SQL Server. Cross tabs are a great way to summarize data. And given that Business Intelligence is a hot topic, knowing how...
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Learn how to Work Joins and Messy Data
In this puzzle, we are going to learn how to join dirty data using the SQL Server. There are many instances that you are forced to use someone else’s data. Since it is their system and data (not...
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Use Subquery with Bill of Materials
In this puzzle, we’re going to learn how to work with the AdventureWorks Bill of Materials table. Companies use a BOM (Bill of Materials) to itemize the products that are used or contained in another...
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How to Create A Bar Chart Using SQL Server
We are going to learn how to create a bar chart using SQL server in this puzzle. It can sometimes be fun to see what you can do with the SELECT statement. Besides, I figured it would be fun to see if I...
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How do I use the Like Clause in SQL Server?
In this video we’ll walk you though how to use the LIKE clause. We’ll show you how to you can perform partial matches, such as being able to match all names beginning with “B” or ending in “Y.”...
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How to Find a Gap in a Sequence using SQL SERVER
In this puzzle, we’re going to learn how to find a gap in a sequence using SQL Server. I was recently reviewing my bank statement and noticed they flagged the start of a missing check number with...
View ArticleReturn the first rows from your result.
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 the result. We’ll also show you how to use one sort to select the...
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SQL Puzzle: How to Calculate Moving Averages
In this puzzle, we’re going to learn how to calculate moving averages by working through a hypothetical stock market example. Solving puzzles is a great way to learn SQL. Nothing beats practicing what...
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Rank Data with SQL
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 is a great way to learn SQL. Nothing beats practicing what...
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SQL DISTINCT Clause For SQL Server
Use the SQL DISTINCT clause to return a unique list of values from a SQL SELECT statement. With DISTINCT, you elect to return unique values based on a combination of one or more columns. SQL DISTINCT...
View ArticleSQL COALESCE Function and NULL
Knowing when to use the SQL COALESCE function is a lifesaver when you’re dealing with NULL. As you know, NULL is a tricky concept, and it seem what ever NULL “touches” in an expression, it renders the...
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SQL Server Hierarchical Query using the hierarchyid type
In this SQL minute we’ll look at how to create a SQL server hierarchical query using the hierarchyid data type. This is a two-part article. In part one you were introduced to the hierarchyid type....
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Use hierarchyid to query Hierarchical data
In this SQL minute we’ll look at how you can use hierarchyid to query hierarchy data. This is a two-part article. In this article we look at how to do one query to get portion of the hierarchy....
View ArticleCan I have a CASE Statement in the WHERE Clause?
A common question I get ask is whether I can have a CASE Statement in the WHERE Clause. There are so many examples of CASE being used in SELECT columns, or in ORDER BY that we tend to forget CASE can...
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