Fixed performance issue union select #1

src-modules/module/costage/hilfstabellen/costage_st_studien_aggr_fuellen.sql

@@ -264,11 +264,31 @@ select st_studium_nr,
       -- where semester = 20202
        --and matrikelnummer = '5545242'
       where kz_rueck_beur_ein is not null
-
+;
 
 -- The below code appends the data for the records having kz_rueck_beur_ein as NULL, this data could be helpful for other diagonostic purpose; here this is segregated 
 -- from above to accomodate ranking in  studiengangNummer field
-union
+insert into costage_st_studien_aggr(
+st_studium_nr,
+       st_studstamm_nr,
+       matrikelnummer,
+       st_studiengang_nr,
+       st_studienstatus_nr,
+       statustyp,
+       hrst,
+       semester,
+       fachsemester,
+       hssem,
+       primaerflag,
+       studiengang_nr,
+       fach_nr,
+       unikey,
+       anfdat,
+       ruebeudat,
+       endedat,
+       stufrm,
+       kz_rueck_beur_ein
+       )
        
 select st_studium_nr,
        st_studstamm_nr,