SELECT distinct to_char(category_set_id) ID, category_set_name VALUE FROM msc_category_sets UNION ALL SELECT 'NA' ID, 'Not Categorized' VALUE FROM dual
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SELECT DISTINCT TO_CHAR(CATEGORY_SET_ID) ID , CATEGORY_SET_NAME VALUE FROM MSC_CATEGORY_SETS UNION ALL SELECT 'NA' ID , 'NOT CATEGORIZED' VALUE FROM DUAL