SAP HANA SQL GROUP BY / ORDER BY / OVER / CASE

简单举例

select name, score1, score2, nextscore1,
      case 
           when ((nextscore1 IS NOT NULL) AND (score1 - nextscore1 < 0.1))
           then score2 
           else score1 
      end score_sort1,
      case when (nextscore1 IS NOT NULL) AND (score1 - nextscore1 < 0.1) 
           then score1 
           else score2 
      end score_sort2
from
    (select 
          name,
          score1,
          score2,
          LEAD(score1, 1) over (order by score1 desc, score2 desc) as     nextscore1
    from
        scores
    group by
          name,
          score1,
          score2)
ORDER BY 
      case 
           when ((nextscore1 IS NOT NULL) AND (score1 - nextscore1 < 0.1))
           then score2 
           else score1 
      end ,  
      case when (nextscore1 IS NOT NULL) AND (score1 - nextscore1 < 0.1) 
           then score1 
           else score2 
      end ;