February 14, 2013

Parsename to Extract Precision and Scale values‏ From Decimal Numbers




The numeric datatype stores numbers with precision and scale. Suppose you want to extract only a precision or a scale, you can do it via many ways. One of the ways is to make use of the PARSENAME function.

Consider the following example

declare @amount decimal(12,2)
set @amount=87234.50
select parsename(@amount,2) as precision, parsename(@amount,1) as scale


The result is

precision            scale
---------            --------
87234                  50

Parsename is used to extract specified part of a name. In general, it is used to extract names from four part object names separated by a dot. Argument number 1 extracts the last part of a string, and the 2nd argument extracts the next last part.

This way we can effectively make use of parsename function to extract precision and scale values from the decimal numbers.


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About The Author

Madhivanan,an MSc computer Science graduate from Chennai-India, works as a works as a Lead Subject Matter Expert at a company that simplifies BIG data. He started his career as a developer working with Visual Basic 6.0, SQL Server 2000 and Crystal Report 8. As years went by, he started working more on writing queries in SQL Server. He now has good level of knowledge in SQLServer, Oracle, MySQL and PostgreSQL as well. He is also one of the leading posters at www.sqlteam.com and a moderator at www.sql-server-performance.com. His T-sql blog is at http://beyondrelational.com/blogs/madhivanan

 
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