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我正在根据客户状态在 oracle 中构建一个简单的事实表，其中客户的状态为“活动”和“丢失”，以及他们以该状态开始的日期和结束的日期。

样本 3 行将是；

CustID | status | date_start | date_end   
---------------------------------------
  1    | active |   1/1/13   |  1/12/14  
  1    | lost   | 1/12/14    | 31/12/9999  
  2    |active  | 1/12/14    | 31/12/9999

在这里，cust 1 处于活动状态，然后丢失。当帐户状态为当前状态（截至今天）时，结束日期列是 31/12/9999。Cust 2 从今天开始有效

我的问题是，我怎样才能把它带入事实表？

CREATE TABLE temp AS 
SELECT  CS.contract_status_id , to_char(ASH.Contract_Status_Start, 'DD/MM/YYYY') AS cust_status_start_date, to_char(ASH.CONTRACT_STATUS_END, 'DD/MM/YYYY') As cust_status_end_date
FROM account_status_history ASH,   
customer_status_dim CS
WHERE ASH.contract_status = CS.contract_status

事实表： 

CREATE TABLE customer_status_fact AS
SELECT T.cust_status_start_date, T.cust_status_end_date, T.contract_status_id,
count(T.contract_status_id) AS TOTAL_ACCOUNTS
FROM temp T
GROUP BY T.cust_status_start_date, T.cust_status_end_date, T.contract_status_id

并对其进行测试；

select sum(F.TOTAL_ACCOUNTS), CS.contract_status_txt 
from customer_status_fact F, customer_status_dim CS

where F.contract_status_id = CS.contract_status_id
and F.cust_status_start_date <= sysdate 
and F.cust_status_end_date = '31/12/9999'
group by CS.contract_status_txt

我似乎无法让 oracle 识别 9999 年任何帮助表示赞赏

4

1 回答 1

3

和 F.cust_status_end_date = '31/12/9999'

'31/12/9999'不是DATE，它是用单引号括起来的字符串。您必须使用TO_DATE将其显式转换为 DATE。

例如，

SQL> alter session set nls_date_format='DD/MM/YYYY HH24:MI:SS';

Session altered.

SQL> SELECT to_date('31/12/9999 23:59:59','DD/MM/YYYY HH24:MI:SS') FROM dual;

TO_DATE('31/12/9999
-------------------
31/12/9999 23:59:59

SQL>

或者，

SQL> SELECT to_date(5373484, 'J') + (1 - 1/24/60/60) FROM dual;

TO_DATE(5373484,'J'
-------------------
31/12/9999 23:59:59

SQL>

CREATE TABLE temp AS SELECT CS.contract_status_id , to_char(ASH.Contract_Status_Start, 'DD/MM/YYYY') AS cust_status_start_date, to_char(ASH.CONTRACT_STATUS_END, 'DD/MM/YYYY') As cust_status_end_date

为什么要创建一个将 DATE 转换为 STRING 的表？你应该让日期保持原样。您应该仅将TO_CHAR用于显示目的。对于任何日期计算，让日期保持为日期。

于 2015-02-13T05:04:44.100 回答