teradata SQL sequence generation - response (3) by TD_Raj

TRY THIS:
 

INSERT INTO xref_subject_area

SEL TB3.MAX_ID+CSUM(1,TB1.subject_area_nm) AS subject_area_ID,

TB1.subject_area_nm,TB1.subject_area_nm||' DESC' 

FROM

detail_stg TB1

LEFT OUTER JOIN

xref_subject_area TB2

ON TB1.subject_area_nm = TB2.subject_area_nm

INNER JOIN

(SEL MAX(subject_area_ID) AS MAX_ID FROM  xref_subject_area) TB3

ON 1=1

WHERE TB2.subject_area_nm IS NULL

;