If you run a select statement and get the following error…
"SQLSTATE 01517: A character that could not be converted was replaced with a substitute character."
… you can use the TRANSLATE function to strip away printable chars, and compare that to a zero length string like so…
SELECT *
FROM XX.TBL
WHERE TRANSLATE(UPPER(FIELD_X),'','ABCDEFGHIJKLMNOPQRSTUVWXYZ1234567890!@#$%^&*()-=+/\{}[];:.,<>? ') <> ''
FOR READ ONLY WITH UR;
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