當字段唯一時選擇count（）

我在vfp中使用SQL，所以我的一些命令是不同的。使用iif([condition],[if true],[if false])代替case when。當字段唯一時選擇count（）

這裏是我的代碼：

SELECT 
    giftsource, 
    COUNT(donor) AS total_gifts, /*this is not the one that need fixed*/ 
    SUM(amt) AS total_amt, 
    SUM(iif(unique = 1 AND language != 'F' AND renew = '0' AND type = 'IN',1,0)) as d_Count_E_New_Indiv, 
    SUM(iif(unique = 1 AND language = 'F' AND renew = '0' AND type = 'IN',1,0)) as d_Count_F_New_Indiv, 
    SUM(iif(unique = 1 AND language != 'F' AND renew != '0' AND type = 'IN',1,0)) as d_Count_E_Re_Indiv, 
    SUM(iif(unique = 1 AND language = 'F' AND renew != '0' AND type = 'IN',1,0)) as d_Count_F_Re_Indiv, 
    SUM(iif(unique = 1 AND language != 'F' AND renew = '0' AND type != 'IN',1,0)) as d_Count_E_New_Org, 
    SUM(iif(unique = 1 AND language = 'F' AND renew = '0' AND type != 'IN',1,0)) as d_Count_F_New_Org, 
    SUM(iif(unique = 1 AND language != 'F' AND renew != '0' AND type != 'IN',1,0)) as d_Count_E_Re_Org, 
    SUM(iif(unique = 1 AND language = 'F' AND renew != '0' AND type != 'IN',1,0)) as d_Count_F_Re_Org, 
FROM (select *, 
      cast(/* equivalent to a bunch of if elses*/ 
       iif( list_code="WEB","1", 
       iif( list_code="GRO","2", 
       iif( list_code="CHO","3", 
       iif( list_code="TEL","4", 
       iif( list_code="TES","5", 
       iif( list_code="POS" AND amt < 10000,"6", 
       iif((LIKE(list_code,"4%") OR list_code = "4") AND amt < 10000,"7", 
       iif((LIKE(list_code,"4%") OR list_code = "4" OR list_code = "POS") AND amt >= 10000,"8", 
       iif( LIKE(list_code,"9%") OR list_code = "9","9", 
       "10"))))))))) as c(1)) 
      as giftsource 
     from cGift) gift 
    LEFT JOIN 
      (select didnumb, language, type from dp) d 
     on cast(gift.donor as i) = cast(d.didnumb as i) 
    LEFT JOIN /*this does not do what i want it to*/ 
      (select min(gidnumb) gid, 1 as unique from cGift group by donor) uGift 
     on gift.gidnumb = uGift.gid 
GROUP BY giftsource 
ORDER BY giftsource

這段代碼應該做的是找到每個禮品類內捐了許多捐助者。它不應該統計同一領域內的重複捐贈者（即相同的list_code/lang/renew /等），但如果是另一個領域，它應該計數捐獻者兩次。

示例：捐獻者＃3只能在d_Count_E_New_Indiv中計數一次，但也可以在d_Count_E_New_Org中計數。

gidnumb是此表中的主鍵。

隨着我的第二次加入，我給表中的第一個捐助者附加了一個字段（名爲unique）。這是行不通的，因爲它只計算一個領域的捐助者。

有人能告訴我什麼是正確的做法嗎？我還有更多的SUM（...）不是基於獨特的捐助者，所以我寧願不要屠殺我的選擇太多。

編輯：我固定它通過以下select count(distinct IIF(renew = '0' AND lang != 'F',donor,0)) FROM dpgift

來源

2012-02-27 slicedtoad

如何使用單個查詢所有相關領域組（貌似giftsource，語言，更新和類型），以獲得一個記錄你所需要的次數來對每個組合：

SELECT giftsource, language, renew, type, COUNT(*) ; 
    FROM <whatever tables and joins you need> ; 
    GROUP BY giftsource, language, renew, type

然後，你可以將它加入到任何你需要的地方，或者使用一些Xbase代碼將它拉入單行。您也可以查看交叉表（使用VFPXTab或第三方工具之一）來轉發數據。

來源

2012-02-27 22:28:54

謝謝，我已經實現了與此非常相似的內容。 – slicedtoad 2012-02-28 15:25:00

我想你可以逃脫COUNT（不同的供體）AS total_gifts，我沒有視覺狐狸親和做了一些谷歌上搜索，它被提及。

來源

2012-02-27 17:33:03

是的，我可以做'選擇計數（不同的捐助者）'。我怎麼會把這個到我的代碼，但？我使用'sum（iif（expression，1,0））'因爲我需要一個過濾器。 – slicedtoad 2012-02-27 18:24:51

哦，這不是需要修復的total_gifts。這是所有的總和（）作爲計數。 – slicedtoad 2012-02-27 18:28:07

當字段唯一時選擇count（）

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