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BRAINDUMP

All About SQL Functions
By: James Payne
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    2007-12-17


    Table of Contents:
  • All About SQL Functions
  • More Aggregate Functions
  • STDEV
  • Scalar Functions
  • Mid(c,start[,end]
  • Round(c,decimals)

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    All About SQL Functions - STDEV
    ( Page 3 of 6 )

    When you are dealing with a huge amount of data, STDEV can return the Standard Deviation of a column. You have to have a minimum of two values or the value returned will be null.

    Here is how it looks in code:


    Select STDEV(Salary) As SDSalary

    From Employees

    The above function takes a sampling of your data instead of the whole list, and returns the standard deviation.

    STDEVP

    If you want to work with all the data in a column to find the standard deviation, you can use STDEVP instead.


    Select STDEVP(Salary) As DevSalary

    From Employees

    VAR

    The VAR Function allows you to find the variance of a set of data from a column. Like STDEV, VAR only works with a sampling and not the whole column. And again, you must have at least two values in the column or a null will be returned.


    Select VAR(Salary) As VARSalary

    From Employees

    VARP

    To get a variance using all of the data in a column, use this handy little guy.


    Select VARP(Salary) As VARPSalary

    From Employees



     
     
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