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Transact-SQL Programming and Query Writing Tutorial: 02 - Implicit Datatype Conversion and How SQL Server Converts Data in Expressions

   Chapter: Table Design - Datatypes, Constraints, IDENTITY Columns, Normalization, and More
Download! Skill Level: 200 (Beginner - Intermediate)
Duration: 11:00
Size: 9.17MB
Versions/Editions Covered: SQL Server 2005 , SQL Server 2008 , SQL Server 2000
Added/Updated: Feb 20, 2007
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This video is all about how SQL Server can automatically (implicitly) convert datatypes in expressions. For example, in the expression 'SELECT 1 + 10000 + 0.00', what will the return datatype be? 1 could be a BIT, a TINYINT, a SMALLINT, an INT, or a BIGINT - which is it? 10000 could be a SMALLINT, INT or BIGINT. 0.00 could be a DECIMAL, NUMERIC, FLOAT, REAL, MONEY, or SMALLMONEY.

Highlights from this video:
  • In the expression, SELECT '123', is '123' a string or a number?
  • In the expression, SELECT 2007/08/08, is the return type an INT, a DECIMAL, or a DATETIME?
an much more on datatypes

So what is the answer to our question above? The answer is that if you just typed that expression in, your return type would be a FLOAT.
Tags for this video: cast cast and convert convert data type conversion decimal float int32 int64 numeric nvarchar(max) real varchar(max)  
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This video is part of the following video series: "Data Type Overview - Order of Precendence, Using CAST and CONVERT, and Best Practices for Data Type Conversion"
All SQL developers should have command of the datatype conversion functions, CAST and CONVERT. All SQL developers should also have full knowledge of the data types themselves (i.e., which holds a larger number, FLOAT or REAL?).

This video series helps you cope with the various data types as well as helping you learn how implicit and explicit datatype conversion works (i.e., converting from a string to a number) and much, much more.
To view all videos in this series, click here

About the Instructor:
Scott Whigham Scott Whigham is the founder of LearnItFirst.com, one of the web's most extensive video training libraries focusing on technical training. Scott is also an experienced consultant, trainer, and author with more than a decade of hands-on experience working with SQL Server databases, writing and debugging applications using Visual Studio, and performance tuning. Scott designed the architecture (websites, class libraries, and database) for the LearnItFirst.com websites and, most re... (Scott Whigham's full bio can be found on the About the Author page)

   
 
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1/6/2009 2:41:07 PM