Teradata

Question

我在尝试下面的运行脚本时遇到错误 "cannot nest aggregate operations"。我搜索了具有类似标题的其他问题，但他们没有解决这个问题。

我正在尝试对一个时期的数据求和，对同一时期的其他数据求和，然后从另一个中减去一个。在我看来很简单！有人可以帮忙吗？

SELECT 
SUM(CASE WHEN a.post_ts(DATE) between 1140921 and 1140927 THEN (pnt_amt(DEC (16,0)))   
- sum ((dlr_val*1000)*-1)END) Week 34 
FROM DB.T1 b  
,DB.T2 a 
LEFT JOIN DB.T3 c ON A.OID = C.OID 
WHERE a.lid = b.lid

或者这个：

Sel
SUM(CASE WHEN a.post_ts(DATE) between 1140921 and 1140927 THEN (pnt_amt(DEC (16,0)))  
-  SUM(CASE WHEN a.post_ts(DATE) between 1140921 and 1140927 THEN sum ((dlr_val*1000)*-1)END)week_34
 FROM DB.T1 b  
,DB.T2 a 
LEFT JOIN DB.T3 c ON A.OID = C.OID 
WHERE a.lid = b.lid

Answer 1

我不知道你到底想做什么，但它可能是这样的：

SELECT 
SUM(CASE WHEN a.post_ts(DATE) BETWEEN 1140921 AND 1140927 THEN (pnt_amt(DEC (16,0))) END  
- SUM((dlr_val*1000)*-1)) Week 34 
FROM DB.T1 b  
,DB.T2 a 
LEFT JOIN DB.T3 c ON A.OID = C.OID 
WHERE a.lid = b.lid

或

SEL
SUM(CASE WHEN a.post_ts(DATE) BETWEEN 1140921 AND 1140927 THEN (pnt_amt(DEC (16,0))) END) 
-  SUM(CASE WHEN a.post_ts(DATE) BETWEEN 1140202 AND 1140208 THEN (dlr_val*1000)*-1 END)week_34
 FROM DB.T1 b  
,DB.T2 a 
LEFT JOIN DB.T3 c ON A.OID = C.OID 
WHERE a.lid = b.lid

顺便说一句，你可以简单地使用 -dlr_val*1000) 而不是 dlr_val*1000)*-1 并且你最好切换到 DATE '2014-02-02' 而不是 1140202，这样更容易理解。

Teradata - 案例陈述中的嵌套聚合操作

Teradata - Nest Aggregate Operations in Case Statement

case-statement