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  1. Preface
  2. The Transformation Language
  3. Constants
  4. Operators
  5. Dates
  6. Functions
  7. Creating Custom Functions
  8. Custom Function API Reference
  9. POWERCENTERHELP

Transformation Language Reference

Transformation Language Reference

MAX (Numbers)

MAX (Numbers)

Returns the maximum numeric value found within a port or group. You can apply a filter to limit the rows in the search. You can nest only one other aggregate function within MAX. You can also use MAX to return the latest date or the highest string value in a port or group.

Syntax

MAX(
numeric_value
[,
filter_condition
] )
The following table describes the arguments for this command:
Argument
Required/
Optional
Description
numeric_value
Required
Numeric datatype. Passes the numeric values for which you want to return a maximum numeric value. You can enter any valid transformation expression.
filter_condition
Optional
Limits the rows in the search. The filter condition must be a numeric value or evaluate to TRUE, FALSE, or NULL. You can enter any valid transformation expression.

Return Value

Numeric value.
NULL if all values passed to the function are NULL or if no rows are selected (for example, the filter condition evaluates to FALSE or NULL for all rows).
If the return value is Decimal with precision greater than 15, you can enable high precision to ensure decimal precision up to 28 digits.

Nulls

If a value is NULL, MAX ignores it. However, if all values passed from the port are NULL, MAX returns NULL.
By default, the
PowerCenter Integration Service
treats null values as NULLs in aggregate functions. If you pass an entire port or group of null values, the function returns NULL. However, when you configure the
PowerCenter Integration Service
, you can choose how you want to handle null values in aggregate functions. You can treat null values as 0 in aggregate functions or as NULL.

Group By

MAX groups values based on group by ports you define in the transformation, returning one result for each group.
If there is no group by port, MAX treats all rows as one group, returning one value.

Example

The first expression returns the maximum price for flashlights:
MAX( PRICE, ITEM_NAME='Flashlight' )
ITEM_NAME
PRICE
Flashlight
10.00
Regulator System
360.00
Flashlight
55.00
Diving Hood
79.00
Halogen Flashlight
162.00
Flashlight
85.00
Flashlight
NULL
RETURN VALUE:
85.00