SQL加入问题

时间:2009-10-30 18:43:01

标签: sql oracle join

以下是我的情况:

我有一张表,其中包含销售的药品清单,其中包含NDC(标识符),销售数量以及药品是品牌名称还是通用名称。我有另一张表,其中包含处方号,日期和NDC。

我需要生成前50种仿制药和前50种品牌药的最新4种处方号列表。

简化示例:

Drug_list:
NDC   QTY      Type
123   50       Generic
125   47       Brand
128   34       Generic
...
549   1        Brand
294   1        Generic

Claims_list:
NDC  RX_num  Date
123  1234    20081027
123  4194    20090517
594  12598   20091012

如何编写联接以生成

列表
NDC RX1, RX2, RX3, RX4

NDC是50个最常见的“品牌”NDC,以下RX是最近声明的RX号码?

~~~~~~~

到目前为止,我已经得到了这个:

select t.ndc, cl.rx, cl.date from (
select * from (
select * from (
select * from drug_list where brand = 'Generic')
order by qty)
where rownum < 51) t
join claims_list cl on cl.ndc = t.ndc
order by t.ndc, cl.date;

这让我成为那里的一部分。从那里开始,我如何将其减少到每个NDC只有4个结果?而且,是否有可能从以下方面得到它:

NDC, RX1, RX2, RX3, RX4

如果我必须将其报告为:

NDC1, RX1
NDC1, RX2
NDC1, RX3
NDC1, RX4
NDC2, RX1
NDC2, RX2
NDC2, RX3
NDC2, RX4
NDC3, RX1
... etc

但我更愿意将它放在一条线上。

~~~~ (根据注释的要求:为表格表创建表语句):

create table drug_list
(NDC varchar2(15), QTY number, type varchar2(10));

create table claims_list
(NDC varchar2(15), RX_num varchar2(20), "date" date);

3 个答案:

答案 0 :(得分:1)

您可以结合使用Google Analytics(如果您使用的是最新的Oracle版本)和数据透视表来完成此操作。这应该适用于您的数据集。

select ndc,
       max(decode(rn, 1, rx_num, null)) rx1,
       max(decode(rn, 2, rx_num, null)) rx2,
       max(decode(rn, 3, rx_num, null)) rx3,
       max(decode(rn, 4, rx_num, null)) rx4
  from (select *
          from (select claims_list.ndc,
                       claims_list.rx_num,
                       row_number() over (partition by claims_list.ndc order by claims_list.date desc) rn
                  from claims_list,
                       (select * 
                          from (select *
                                  from drug_list
                                 where type = 'Generic'
                                order by qty desc
                               )
                         where rownum < 51
                       ) drug_list
                 where drug_list.ndc = claims_list.ndc
               )
         where rn < 5
        order by ndc, rn
       )
group by ndc;

内部查询使用分析根据声明日期提取每种药物的最新4个rx数字。然后我们使用一个转轴将它从每个药物的4行带到4行的一行。

答案 1 :(得分:0)

做出一些假设,我不确定确切的Oracle语法......但是呢:

SELECT
    "ndc" as NDC,
    ( SELECT "rx_num" from "rx" WHERE "ndc"="drug_list"."ndc" ORDER BY "date" DESC LIMIT 1 OFFSET 0 ) as RX1,
    ( SELECT "rx_num" from "rx" WHERE "ndc"="drug_list"."ndc" ORDER BY "date" DESC LIMIT 1 OFFSET 1 ) as RX2,
    ( SELECT "rx_num" from "rx" WHERE "ndc"="drug_list"."ndc" ORDER BY "date" DESC LIMIT 1 OFFSET 2 ) as RX3,
    ( SELECT "rx_num" from "rx" WHERE "ndc"="drug_list"."ndc" ORDER BY "date" DESC LIMIT 1 OFFSET 3 ) as RX4
FROM "drug_list"
ORDER BY qty ASC
LIMIT 4

NDC | RX1 | RX2 | RX3 | RX4
123   2332  2342  2346  7776

答案 2 :(得分:0)

这会让你们每个人都分开来一行:

SELECT
  `cl`.`ndc`,
  `cl`.`rx_num`
FROM `claims_list` AS `cl`
WHERE `cl`.`ndc` IN
  (
    SELECT `dl`.`ndc` FROM `drug_list` AS `dl`
    WHERE `dl`.`type` = 'Generic'
    ORDER BY `dl`.`qty` DESC
    LIMIT 50
  )
ORDER BY `cl`.`date` DESC
LIMIT 4

然后通过调用脚本中的过滤器运行结果,将它们组合在一起。