Aggregate Functions (SqlClient for Entity Framework)
The .NET Framework Data Provider for SQL Server (SqlClient) provides aggregate functions. Aggregate functions perform calculations on a set of input values and return a value. These functions are in the SqlServer namespace, which is available when you use SqlClient. A provider's namespace property allows the Entity Framework to discover which prefix is used by this provider for specific constructs, such as types and functions.
The following are the SqlClient aggregate functions.
AVG(expression)
Returns the average of the values in a collection. Null values are ignored.
Arguments
An Int32, Int64, Double, and Decimal.
Return Value
The type of expression.
Example
SELECT VALUE SqlServer.AVG(p.ListPrice)
FROM AdventureWorksEntities.Products AS p
CHECKSUM_AGG(collection)
Returns the checksum of the values in a collection. Null values are ignored.
Arguments
A Collection(Int32).
Return Value
An Int32.
Example
SELECT VALUE SqlServer.Checksum_Agg(cast(product.ListPrice AS Int32))
FROM AdventureWorksEntities.Products AS product
WHERE product.ListPrice > cast(@price AS Decimal)
COUNT(expression)
Returns the number of items in a collection as an Int32.
Arguments
A Collection<T>, where T is one of the following types:
BooleanDoubleDateTimeDateTimeOffsetTimeStringBinaryGuid(not returned in SQL Server 2000)
Return Value
An Int32.
Example
ANYELEMENT(SELECT VALUE SqlServer.COUNT(product.ProductID)
FROM AdventureWorksEntities.Products AS product
WHERE SqlServer.CEILING(product.ListPrice) ==
SqlServer.FLOOR(product.ListPrice))
COUNT_BIG(expression)
Returns the number of items in a collection as a bigint.
Arguments
A Collection(T), where T is one of the following types:
BooleanDoubleDateTimeDateTimeOffsetTimeStringBinaryGuid(not returned in SQL Server 2000)
Return Value
An Int64.
Example
ANYELEMENT(SELECT VALUE SqlServer.COUNT_BIG(product.ProductID)
FROM AdventureWorksEntities.Products AS product
WHERE SqlServer.CEILING(product.ListPrice) ==
SqlServer.FLOOR(product.ListPrice))
MAX(expression)
Returns the maximum value the collection.
Arguments
A Collection(T), where T is one of the following types:
BooleanDoubleDateTimeDateTimeOffsetTimeStringBinary
Return Value
The type of expression.
Example
SELECT VALUE SqlServer.MAX(p.ListPrice)
FROM AdventureWorksEntities.Products AS p
MIN(expression)
Returns the minimum value in a collection.
Arguments
A Collection(T), where T is one of the following types:
BooleanDoubleDateTimeDateTimeOffsetTimeStringBinary
Return Value
The type of expression.
Example
SELECT VALUE SqlServer.MIN(p.ListPrice)
FROM AdventureWorksEntities.Products AS p
STDEV(expression)
Returns the statistical standard deviation of all values in the specified expression.
Arguments
A Collection(Double).
Return Value
A Double.
Example
SELECT VALUE SqlServer.STDEV(product.ListPrice)
FROM AdventureWorksEntities.Products AS product
WHERE product.ListPrice > cast(@price AS Decimal)
STDEVP(expression)
Returns the statistical standard deviation for the population for all values in the specified expression.
Arguments
A Collection(Double).
Return Value
A Double.
Example
SELECT VALUE SqlServer.STDEVP(product.ListPrice)
FROM AdventureWorksEntities.Products AS product
WHERE product.ListPrice > cast(@price AS Decimal)
SUM(expression)
Returns the sum of all the values in the collection.
Arguments
A Collection(T) where T is one of the following types: Int32, Int64, Double, Decimal.
Return Value
The type of expression.
Example
SELECT VALUE SqlServer.SUM(p.ListPrice)
FROM AdventureWorksEntities.Products AS p
VAR(expression)
Returns the statistical variance of all values in the specified expression.
Arguments
A Collection(Double).
Return Value
A Double.
Example
SELECT VALUE SqlServer.VAR(product.ListPrice)
FROM AdventureWorksEntities.Products AS product
WHERE product.ListPrice > cast(@price AS Decimal)
VARP(expression)
Returns the statistical variance for the population for all values in the specified expression.
Arguments
A Collection(Double).
Return Value
A Double.
Example
SELECT VALUE SqlServer.VARP(product.ListPrice)
FROM AdventureWorksEntities.Products AS product
WHERE product.ListPrice > cast(@price AS Decimal)