Wie Fall machen in HANA

Question

Ich habe die folgende Abfrage in Postgres, die den Meter-Bereich und die Anzahl der Fahrzeuge gibt reiste zwischen dem Bereich

SELECT (CASE WHEN meter >= 0 AND meter< 10000 THEN '0-10' 
      WHEN meter >= 10000 AND meter < 20000 THEN '10-20' 
      WHEN meter >= 20000 AND meter <30000 THEN '20-30' 
      WHEN meter >= 30000 AND meter < 40000 THEN '30-40' 
      WHEN meter >= 40000 AND meter < 50000 THEN '40-50' 
      WHEN meter >= 50000 AND meter < 60000 THEN '50-60' 
      WHEN meter >= 60000 AND meter <70000 THEN '60-70' 
      WHEN meter >= 70000 AND meter < 80000 THEN '70-80' 
      WHEN meter >= 80000 AND meter < 100000 THEN '80-90' 
      WHEN meter >=100000 THEN 'above 100' 
     END) as range,count(*) as vehicle_count 
     from ( 



     SELECT extract (day from time) as day, place,vehicle_id,sum(meter_two_points) as meter 
FROM public.datatable where time >= '2015-09-05 00:00:00' and time <= '2015-09-05 23:00:00' and place=10 
    group by day,vehicle_id,place 
    order by day,vehicle_id 



) as A group by range order by range limit 10 

ich jetzt die gleiche Abfrage für die gleiche Tabelle tun möchte HANA.So ich habe versucht, mit

SELECT (CASE WHEN meter >= 0 AND meter< 10000 THEN '0-10' 
       WHEN meter >= 10000 AND meter < 20000 THEN '10-20' 
       WHEN meter >= 20000 AND meter <30000 THEN '20-30' 
       WHEN meter >= 30000 AND meter < 40000 THEN '30-40' 
       WHEN meter >= 40000 AND meter < 50000 THEN '40-50' 
       WHEN meter >= 50000 AND meter < 60000 THEN '50-60' 
       WHEN meter >= 60000 AND meter <70000 THEN '60-70' 
       WHEN meter >= 70000 AND meter < 80000 THEN '70-80' 
       WHEN meter >= 80000 AND meter < 100000 THEN '80-90' 
       WHEN meter >=100000 THEN 'above 100' 
      END) as range,count(*) as vehicle_count 
      from ( 


      But it throws with the error `invalid column name range` 
      SELECT to_integer(to_varchar(time,'DD')) as day, place,vehicle_id,sum(meter_two_points) as meter 
    FROM public.datatable where time >= '2015-09-05 00:00:00' and time <= '2015-09-05 23:00:00' and place=10 
     group by day,vehicle_id,place 
     order by day,vehicle_id 



    ) as A group by range order by range limit 10 

Answer 1

Sie auf diese ändern können:

SELECT range, 
    COUNT(*) AS vehicle_count 
FROM (
    SELECT (CASE WHEN meter >= 0 AND meter< 10000 THEN '0-10' 
       WHEN meter >= 10000 AND meter < 20000 THEN '10-20' 
       WHEN meter >= 20000 AND meter <30000 THEN '20-30' 
       WHEN meter >= 30000 AND meter < 40000 THEN '30-40' 
       WHEN meter >= 40000 AND meter < 50000 THEN '40-50' 
       WHEN meter >= 50000 AND meter < 60000 THEN '50-60' 
       WHEN meter >= 60000 AND meter <70000 THEN '60-70' 
       WHEN meter >= 70000 AND meter < 80000 THEN '70-80' 
       WHEN meter >= 80000 AND meter < 100000 THEN '80-90' 
       WHEN meter >=100000 THEN 'above 100' 
      END) AS range 
    FROM ( 
     SELECT to_integer(to_varchar(time,'DDMMYYYY')) AS day, 
      --You should considering using other way to truncate date from time, 
      --not convert too much, 
      --at least you could use only to_varchar is enough 
      place, 
      vehicle_id, 
      SUM(meter_two_points) AS meter 
     FROM public.datatable 
     WHERE time >= '2015-09-05 00:00:00' 
      AND time <= '2015-09-05 23:00:00' 
      AND place=10 
     GROUP BY to_integer(to_varchar(time,'DDMMYYYY')), 
      vehicle_id, 
      place 
    ) 
) AS a 
GROUP BY range 
ORDER BY range 
LIMIT 10;  --why limit 10 here while you only have 10 ranges? 

Und als SQL order of operations, ich frage mich, ob PostgreSQL konnte GROUP BY nach SELECT so Gruppe nach könnte mit Bereich Spalte in Ihrer ersten Abfrage gruppieren.