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我正在尝试计算我的数据中的骑手人数。我很难弄清楚这一点。我的输出示例如下所示。数据来自许多不同的表,我必须加入这些表,这不是我遇到的问题。我正在尝试通过 EVENT by DESCRIPTION 获取 RIDERS 的计数。并且仍然显示如下所述的列。

SQL> SELECT EVENTNAME, DESCRIPTION, RIDERS2  FROM ERP_REPORT;

EVENTNAME              DESCRIPTION                              RIDERS
------------------------------ ------------------------------ 
Ace Rental Car - Fair Hill Inv Day 1 Race on Fair Hill's Easy   Aaron Adams
itational                       level Course

Ace Rental Car - Fair Hill Inv Day 1 Race on Fair Hill's Easy   Aaron Adams
itational                       level Course

Ace Rental Car - Fair Hill Inv Day 2 Race on Fair Hill's Inte   Aaron Adams
itational                      rmediate level Course

Huffy's Mountain Trip          Weekend 1 Race 1 on Huffy Moun   Sam Adams
                           tain's Easy level Course

Valley Spring Water Mountain B Day 3 Race on Hoola Hut Gorge'   Jay Gillgan
ike Extravaganza               s Intermediate level Course

我尝试了一堆不同的代码,但这是我尝试过的一个示例。我对此感到迷茫,所以任何帮助都会很大!

SELECT COUNT(DISTINCT RIDERS) as "RIDERS"
2  FROM ERP_REPORT;
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1 回答 1

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您是否正在寻找类似的东西:

SELECT COUNT(riders) AS rider_count, eventname, description
  FROM erp_report
  GROUP BY eventname, description;
于 2009-12-05T05:39:52.287 回答