DBMAX Function
Syntax
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. Any type
- field
An expression based on character, date, numeric, or exponent numeric field(s) in the Lookup_Table.
Description
Returns the maximum value of matching records in a specified table.
Discussion
DBMAX() searches the specified Lookup_Table for one or more records with the specified Key_Value, and returns the largest value of the values contained in Lookup_Expression. Note : If no records with matching key values are found, Alpha Anywhere returns a zero value.
Assume that a customer order table 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
The following expression returns the largest value in the Amount field for all the records in the Order table with a customer_ID number of "C100":
? dbmax("ORDER.DBF", "CUSTOMER_ID", "C100", "AMOUNT")
= "234.45"This example uses the Customer_ID index to find the last (largest) date of an item sold to customer ID 00000004.
? dbmax("invoice_header", "Customer_ID", "00000004", "date")
= {01/18/2002}See Also