问题描述
我正在尝试通过将联接更改为Study和id和date date -1(在一张表上为正常数据,在另一张表上为date-1)来转换我所拥有的查询,但是我在犯一些错误,这给了我一个错误。
数据库:Oracle,并且在Denodo Server上运行
pedics
study id cal_dtm total
RSCLS CA10001 2020-08-11 52
RSCLS CA10001 2020-08-10 52
ETDLD CA20302 2020-08-11 99
ERGKG CA34524 2020-08-11 31
查询:
select
tt1.study,tt1.id,tt1.cal_dtm,tt1.total,tt1.total-coalesce(tt2.total,0) as delta
from pedics tt1
left outer JOIN pedics tt2 on tt1.total = tt2.total
and extract(month from tt1.cal_dtm)-extract(month from tt2.cal_dtm)=1
查询所需条件并引发错误:
select
tt1.study,(tt1.total-coalesce(tt2.total 0)) as delta
from pedics tt1
left outer JOIN pedics tt2 on tt1.study_name = tt2.study_name and tt1.site_id = tt2.site_id
and extract(month from tt1.cal_dtm)-extract(month from tt2.cal_dtm-1)
错误: 连接视图条件中的错误:函数'-(tt2.cal_dtm,'1')'的参数类型无效
解决方法
如果您要查找该行中的某天与前一天之间的差额,则使用LAG分析功能会更有效。这样,您就可以只查看上一行的“总计”,并找到当前行的总计之间的差异。
设置
我添加了比您提供的更多示例数据,以显示更多案例。
test
查询
CREATE TABLE pedics
(
study VARCHAR2 (5),id VARCHAR2 (7),cal_dtm DATE,total NUMBER
);
INSERT INTO pedics (study,id,cal_dtm,total) VALUES ('RSCLS','CA10001',DATE '2020-08-11',52);
INSERT INTO pedics (study,DATE '2020-08-10',DATE '2020-08-09',50);
INSERT INTO pedics (study,total) VALUES ('ETDLD','CA20302',99);
INSERT INTO pedics (study,total) VALUES ('ERGKG','CA34524',31);
INSERT INTO pedics (study,DATE '2020-08-12',35);
INSERT INTO pedics (study,DATE '2020-08-13',26);
结果
SELECT p.*,total - LAG (total) OVER (PARTITION BY study,id ORDER BY cal_dtm) AS delta
FROM pedics p
ORDER BY study,cal_dtm;