Xbasic

DBAVG Function

Syntax

Average_Of_Values as N = DBAVG(C tablename,C tagname,A keyvalue,C field)

Arguments

tablename

The full drive, path, name, and extension of the table. If you omit the drive, path, and extension, Alpha Anywhere searches the directory of the current table.

tagname

The name of an index.

keyvalue

An explicit value or the name of a field in the table containing a value.

field

An expression based on numeric or exponent numeric field(s) in the Lookup_Table.

Description

Returns the average value for a field in records of a specified table.

Discussion

DBAVG() searches the specified Lookup_Table for one or more records with the specified Key_Value, and returns the average value of the values contained in Lookup_Expression. Note : If no records with matching key values are found, Alpha Anywhere returns a zero value.

Example 

Assume that a customer order table (ORDER) contains the following records:

CUSTOMER_ID
AMOUNT
C100

234.45

C100

123.67

C100

100.23

C101

231.34

C102

111.12

C102

987.23

To determine the average of the values in the AMOUNT field for all the records in the ORDER table with a customer ID number of "C100", use the following expression:

dbavg("ORDER.DBF", "CUSTOMER_ID", "C100", "AMOUNT") -> 152.78

Assume that the CUST_ID field in the current record contains "C102". The following expression returns the average of the values in the AMOUNT field for all the records in the ORDER table with a customer ID number of "C102":

? dbavg("ORDER.DBF", "CUSTOMER_ID", CUSTOMER_ID, "AMOUNT")
= 549.18

This example is based on the invoice_items table of the AlphaSports database.

dim pnum as C = "P001"
? dbavg("invoice_items", "Product_ID", pnum, "Quantity")
= 3.6

See Also