select case when trim(TRANSLATE('99','0123456789', ' ')) is null then 'numeric' else 'alpha' end from dual SELECT CASE WHEN INSTR('-1.-2','-')>1 THEN 'alpha' --if minus is not the very first symbol then ‘alpha’ WHEN '-1.-2' LIKE '%.%.%' THEN 'alpha'--if more than 1 period then ‘alpha’ WHEN '-1.-2' LIKE '-%-%' THEN 'alpha'--if more than one minus then ‘alpha’ WHEN REGEXP_LIKE('-1.-2','^[-0-9.,]*$') THEN 'numeric' --if all symbols are digits, a period, or a minus then ‘numeric’ ELSE 'alpha' END is_numeric FROM dual
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