Processing Stages

The processor applies attribute 8 (pre-processor) codes to data before selecting items and sorting. It applies attribute 7 (input/output) codes just before displaying the data. It applies input conversion, however, to values in selection clauses before selecting items.

The following shows the stages in which processing takes place:

 

Processing Stage

Attribute 8 processing?

Attribute 7 processing?

1.

Value specified by user in a selection clause

no

yes *

2.

Value generated to test against for selection

yes

no

3.

Value generated for use in a sort key

yes

no

4.

Value used for accumulation of a TOTAL

yes

no

5.

Value generated to check for a control break or to test against print limiters

yes

no

6.

Output value in BREAK or TOTAL data line

no

yes

7.

Output value in detail line of listing

yes

yes

* In this case input conversion is done; in all other cases output conversion is applied.

BREAK data line consists of totals, break field labels, and break data values already processed at previous stage.