Assume that a join logical file is specified as in Basic concepts of joining two physical files (example 1), and there are four records in PF1 and three records in PF2, as shown in the following two tables.
| Employee number | Name |
|---|---|
| 235 | Anne |
| 440 | Doug |
| 500 | Mark |
| 729 | Sue |
| Employee number | Salary |
|---|---|
| 235 | 1700.00 |
| 440 | 950.50 |
| 729 | 1400.90 |
In PF2, no record is found for number 500.
The program reads the join logical file and gets the following records.
| Employee number | Name | Salary |
|---|---|---|
| 235 | Anne | 1700.00 |
| 440 | Doug | 950.50 |
| 729 | Sue | 1400.90 |
If you do not specify the JDFTVAL keyword and no match is found for the join field in the secondary file, the record is not included in the join logical file.