WHEN and WHERE
Alternatively, you can specify the general purpose WHERE clause instead of the standard WHEN clause. The WHERE clause references fields by name only and can use arithmetic or character expressions on named fields.
You can perform arithmetic directly on named fields in the input record if the input is in UNLOAD format. If the input is in other formats, you need the S370 function to convert the data to useable numeric form.
Tip: For faster searching, add an asterisk to the end of your partial query. Example: cert*