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All Functions
WHERE Clause
HAVING Clause
GROUP BY Clause
FUNCTION: VARP
SELECT VARP(field) AS [expression]
FROM table
[WHERE ...]
[GROUPBY ...]
[HAVING ...]
The
VARP
function is one of the aggregate functions that are used to calculate statistical information for a specified numeric field in a query. The other aggregate functions are:
AVG, COUNT, MAX, MIN, STDEV, STDEVP, SUM, VAR,
. Note that all of these functions return a single value.
The
VARP
function finds the variance by using all of values in a field. In comaparison, the
VAR
function only uses a portion, called a sample, of the values to calculate the variance. There must be at least two values in the field or the standard deviation will not be calculated and a
NULL
value is returned.
This code finds the variance of the age for all MediCare patients in a hospital and stores that information in VarAge.
SELECT VARP(Age) AS [VarAge]
FROM MediCarePatients
Copyright 1999-2005 by Infinite Software Solutions, Inc. All rights reserved.
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