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SQL Server Compact 4.0

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SQL Reference (SQL Server Compact)

SQL Overview (SQL Server Compact)

+ (Add) (SQL Server Compact)

+ (Positive) (SQL Server Compact)

+ (String Concatenation) (SQL Server Compact)

- (Subtract) (SQL Server Compact)

- (Negative) (SQL Server Compact)

* (Multiply) (SQL Server Compact)

/ (Divide) (SQL Server Compact)

% (Modulo) (SQL Server Compact)

& (Bitwise AND) (SQL Server Compact)

| (Bitwise OR) (SQL Server Compact)

^ (Bitwise Exclusive OR) (SQL Server Compact)

~ (Bitwise NOT) (SQL Server Compact)

= (Equals) (SQL Server Compact)

> (Greater Than) (SQL Server Compact)

< (Less Than) (SQL Server Compact)

>= (Greater Than or Equal To) (SQL Server Compact)

<= (Less Than or Equal To) (SQL Server Compact)

<> (Not Equal To) (SQL Server Compact)

!= (Not Equal To) (SQL Server Compact)

!< (Not Less Than) (SQL Server Compact)

!> (Not Greater Than) (SQL Server Compact)

@@IDENTITY (SQL Server Compact)

@@DBTS (SQL Server Compact)

@@SHOWPLAN (SQL Server Compact)

ABS (SQL Server Compact)

ACOS (SQL Server Compact)

ALL (SQL Server Compact)

ALTER TABLE (SQL Server Compact)

AND (SQL Server Compact)

ASIN (SQL Server Compact)

ATAN (SQL Server Compact)

ATN2 (SQL Server Compact)

AVG (SQL Server Compact)

BETWEEN (SQL Server Compact)

CASE (SQL Server Compact)

CEILING (SQL Server Compact)

CHARINDEX (SQL Server Compact)

COALESCE (SQL Server Compact)

COLLATE (SQL Server Compact)

CAST and CONVERT (SQL Server Compact)

COS (SQL Server Compact)

COT (SQL Server Compact)

COUNT (SQL Server Compact)

CREATE DATABASE (SQL Server Compact)

CREATE INDEX (SQL Server Compact)

CREATE STATISTICS (SQL Server Compact)

CREATE TABLE (SQL Server Compact)

DATALENGTH (SQL Server Compact)

DATEADD (SQL Server Compact)

DATEDIFF (SQL Server Compact)

DATENAME (SQL Server Compact)

DATEPART (SQL Server Compact)

DDL Statements (SQL Server Compact)

DEGREES (SQL Server Compact)

DELETE (SQL Server Compact)

DML Statements (SQL Server Compact)

DROP INDEX (SQL Server Compact)

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DROP TABLE (SQL Server Compact)

EXISTS (SQL Server Compact)

EXP (SQL Server Compact)

Expressions (SQL Server Compact)

FLOOR (SQL Server Compact)

FROM Clause (SQL Server Compact)

Functions (SQL Server Compact)

GETDATE (SQL Server Compact)

GROUP BY Clause (SQL Server Compact)

HAVING Clause (SQL Server Compact)

Hints (SQL Server Compact)

IDENTITY Property (SQL Server Compact)

IN (SQL Server Compact)

Information Schema (SQL Server Compact)

INSERT (SQL Server Compact)

IS [NOT] NULL (SQL Server Compact)

LEN (SQL Server Compact)

LIKE (SQL Server Compact)

LOG (SQL Server Compact)

LOG10 (SQL Server Compact)

LOWER (SQL Server Compact)

LTRIM (SQL Server Compact)

MAX (SQL Server Compact)

MIN (SQL Server Compact)

NCHAR (SQL Server Compact)

NEWID (SQL Server Compact)

NOT (SQL Server Compact)

OFFSET FETCH Clause (SQL Server Compact)

Operators (SQL Server Compact)

OR (SQL Server Compact)

ORDER BY Clause (SQL Server Compact)

PATINDEX (SQL Server Compact)

PI (SQL Server Compact)

POWER (SQL Server Compact)

RADIANS (SQL Server Compact)

RAND (SQL Server Compact)

REPLACE (SQL Server Compact)

REPLICATE (SQL Server Compact)

Reserved Words (SQL Server Compact)

ROUND (SQL Server Compact)

RTRIM (SQL Server Compact)

SELECT Statement (SQL Server Compact)

SET IDENTITY INSERT (SQL Server Compact)

SET SHOWPLAN_XML (SQL Server Compact)

SET STATISTICS XML (SQL Server Compact)

SIGN (SQL Server Compact)

SIN (SQL Server Compact)

SOME | ANY (SQL Server Compact)

sp_show_statistics (SQL Server Compact)

sp_rename (SQL Server Compact)

SPACE (SQL Server Compact)

SQRT (SQL Server Compact)

STR (SQL Server Compact)

STUFF (SQL Server Compact)

SUBSTRING (SQL Server Compact)

SUM (SQL Server Compact)

TAN (SQL Server Compact)

timestamp (SQL Server Compact)

TOP (SQL Server Compact)

UNICODE (SQL Server Compact)

UNION (SQL Server Compact)

UPDATE (SQL Server Compact)

UPDATE STATISTICS (SQL Server Compact)

UPPER (SQL Server Compact)

USE (SQL Server Compact)

WHERE Clause (SQL Server Compact)

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AVG (SQL Server Compact)

Returns the average of the values in a group. Null values are ignored.


AVG ( [ ALL ] expression )

ALL: Applies the aggregate function to all values. ALL is the default.
expression: An expression of the exact numeric or approximate numeric data type categories, except for the bit data type. Aggregate functions and subqueries are not permitted.

The return type is determined by the type of the evaluated result of expression.

Expression result	Return type
integer category	int
numeric category (p, s)	numeric(28, s) divided by numeric(10, 0)
money category	money
float and real category	float

The following example determines the average weight of products shipped to a company that has a CustomerIDof '123'.

SELECT AVG(Freight) AS "Average Freight" FROM Orders WHERE [Customer ID] = 'VINET' AND [Order ID] IN (10248, 10274, 10295)

This is the result set:

Average Weight
--------------------
13.18

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