Aggregate functions are functions that compute values over all data source records.

 

In the sample below are listed all supported aggregate functions:

 

count-function - returns the number of records in a data-set.

max-set-function - this function starts an iteration over the specified data source and computes the max value of the referenced source from in-param

min-set-function - same as max-set-function only it computes min value.

average-set-function - same as max-set-function only it computes average value from the specified source.

sum-set-function - same as max-set-function only it computes sum value from the specified source.

 

Note. A comprehensive sample using aggregate functions can be found in Samples\Job Samples folder.

 

 

<das:count-function id="1c" data-source="a">

       <das:return-value id="1d"/>

</das:count-function>

 

<das:max-set-function id="10" data-source="a">

       <das:in-param id="12" src="c"/>

       <das:return-value id="11"/>

</das:max-set-function>

 

<das:min-set-function id="13" data-source="a">

       <das:in-param id="15" src="c"/>

       <das:return-value id="14"/>

</das:min-set-function>

 

<das:average-set-function id="16" data-source="a">

       <das:in-param id="18" src="c"/>

       <das:return-value id="17"/>

</das:average-set-function>

 

<das:sum-set-function id="19" data-source="a">

       <das:in-param id="1b" src="c"/>

       <das:return-value id="1a"/>

</das:sum-set-function>

 

 

Attributes:

id - unique identifier of this resource in the current processing job.

data-source - input data source.

 

Children elements:

<das:in-param> - irrelevant for count-function, otherwise mandatory.  Specifies the source over which min, max, average or sum values are to be computed.

<das:return-value> - specifies the id from which the result value of the function will be referenced in the current job.