总计值直到我到达某个点

Question

我正在尝试执行以下操作：

1. 按DIVLOC 和具有最高值的DISTRIB 对记录进行排序
2. 然后将每个DIVLOC 的DISTRIB 相加，直到达到 >=.60
3. 为每个DIVLOC 组成60 条记录的这些记录转为ETAFLAG = 1

所以对于我下面底部的结果示例

-- --Create Fake table 
DECLARE @ETATRACTS TABLE (DIVLOC int, TRACTID int, Distrib float, ETAFLAG bit)

INSERT INTO @ETATRACTS VALUES (71001, 1123, .30, 0)
INSERT INTO @ETATRACTS VALUES (71001, 1010, .20, 0)
INSERT INTO @ETATRACTS VALUES (71001, 3010, .10, 0)
INSERT INTO @ETATRACTS VALUES (71001, 0790, .05, 0)
INSERT INTO @ETATRACTS VALUES (71001, 6010, .05, 0)
INSERT INTO @ETATRACTS VALUES (71250, 3010, .40, 0)
INSERT INTO @ETATRACTS VALUES (71250, 0610, .10, 0)
INSERT INTO @ETATRACTS VALUES (71250, 3210, .10, 0)
INSERT INTO @ETATRACTS VALUES (71250, 1920, .05, 0)
INSERT INTO @ETATRACTS VALUES (71250, 9720, .05, 0)
INSERT INTO @ETATRACTS VALUES (71250, 2110, .05, 0)
INSERT INTO @ETATRACTS VALUES (71425, 5011, .20, 0)
INSERT INTO @ETATRACTS VALUES (71425, 5011, .20, 0)
INSERT INTO @ETATRACTS VALUES (71425, 5011, .05, 0)
INSERT INTO @ETATRACTS VALUES (71425, 5011, .05, 0)
INSERT INTO @ETATRACTS VALUES (71425, 5011, .01, 0)
INSERT INTO @ETATRACTS VALUES (71425, 5011, .01, 0)
INSERT INTO @ETATRACTS VALUES (71425, 5011, .01, 0)
INSERT INTO @ETATRACTS VALUES (71425, 5011, .01, 0)

UPDATE @ETATRACTS
SET ETAFLAG = t.ETAFLAG
FROM @ETATRACTS AS temptable, 
     (SELECT 
          DIVLOC, TRACTID, Distrib,
          (CASE WHEN SUM(Distrib) OVER (PARTITION BY divloc) - Distrib >= 0.2
                 THEN 1
           END) AS ETAFLAG
       FROM @ETATRACTS) AS t
WHERE 
    temptable.divloc = t.DIVLOC AND temptable.TRACTID = t.TRACTID

SELECT * FROM @ETATRACTS

enter image description here

Answer 1

您可以为此编写select 查询：

select e.*,
       (case when sum(Distrib) over (partition by divloc order by Distrib desc) - Distrib < 0.6
             then 1 else 0
        end) as ETAFLAG
from @ETATRACTS e;

这个逻辑可以很容易地放入update：

with toupdate (
      select e.*,
             (case when sum(Distrib) over (partition by divloc order by Distrib desc) - Distrib < 0.6
                   then 1 else 0
              end) as new_ETAFLAG
      from @ETATRACTS e
     )
update toupdate
    set new_ETAFLAG = ETAFLAG;