What Is the Difference Between a Join and a UNION?


Both Joins and UNIONS can be used to combine data from two or more tables.  Read this article to find out each command’s strengths and when to use them. To get the most of this and our other lessons be sure to practice using the examples! All the examples for this lesson are based on…

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Introduction To SQL Server’s Date Functions


SQL server’s date functions provide you a set of function that you can use to manipulate dates.  The function are used for a wide variety of operation such as adding weeks to a date, calculating the difference between two dates, or to decompose a date into its fundamental parts. If you not familiar with SQL…

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Introduction to SQL Server’s Common String Functions


The built in SQL String functions make it possible for you to find and alter text values, such as VARCHAR and CHAR datatypes, in SQLServer.  Using these functions you can alter a text value such as changing “Smith, Joe” to “Joe Smith.” If you not familiar with SQL functions, then I would recommend staring with…

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What is the Difference between a Join and Subquery?


Joins and subqueries are both be used to query data from different tables and may even share the same query plan, but there are many differences between them.  Knowing the differences and when to use either a join or subquery to search data from one or more tables is key to mastering SQL. All the examples…

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Introduction to SQL Server’s Mathematical Functions

Mathematical Functions to Old Way - Slide Rule!

Math Rocks! SQLServer includes many mathematical formulas you can use to perform business and engineering calculations.  Many of these aren’t used in typical day-to-day operations; however, there are several commonly used functions we’ll cover. If you not familiar with SQL functions, then I would recommend staring with the Introduction to SQL Server Built-In Functions. All…

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