不同條件

Question

我有這個簡單的查詢集合函數：

SELECT 
a.new_funderidname as Funder, 
COUNT(a.new_funderidname) as Units 
FROM new_dealsheet a 
LEFT JOIN salesorder B ON a.new_dsheetid = B.salesorderid 
WHERE a.New_PassedToAdmin = 1 
GROUP BY a.new_funderidname 
ORDER BY Units desc 

這很好，但我的乙表包含另一場名爲MAINT，我還需要獲得計數這兩個可能的值，像

SELECT 
a.new_funderidname as Funder, 
COUNT(a.new_funderidname) as Units, 
COUNT(a.new_funderidname) **WHERE b.maint=1 as UnitsMaint**, 
COUNT(a.new_funderidname) **WHERE b.maint=0 as UnitsNotMaint** 
FROM new_dealsheet a 
LEFT JOIN salesorder B ON a.new_dsheetid = B.salesorderid 
WHERE a.New_PassedToAdmin = 1 
GROUP BY a.new_funderidname 
ORDER BY Units desc 

我可以在單個查詢中做到這一點嗎？

感謝

Answer 1

用例

SELECT 
a.new_funderidname as Funder, 
COUNT(a.new_funderidname) as Units, 
sum(case when b.maint=1 then 1 else 0 end) as UnitsMaint, 
sum(case when b.maint=0 then 1 else 0 end) as UnitsNotMaint, 
FROM new_dealsheet a 
LEFT JOIN salesorder B ON a.new_dsheetid = B.salesorderid 
WHERE a.New_PassedToAdmin = 1 
GROUP BY a.new_funderidname 
ORDER BY Units desc 

Answer 2

如果MAINT始終爲0或1，你可以用Sum(b.mainnt)總結他們Sum(1-b.mainnt)

SELECT 
a.new_funderidname as Funder, 
COUNT(a.new_funderidname) as Units, 
Sum(b.mainnt) as UnitsMaint, 
Sum(1 - b.mainnt) as UnitsNotMaint 
FROM new_dealsheet a 
LEFT JOIN salesorder B ON a.new_dsheetid = B.salesorderid 
WHERE a.New_PassedToAdmin = 1 
GROUP BY a.new_funderidname 
ORDER BY Units desc 

你可能需要做內部Sum鑄造如果b.mainnt是bit類型：例如SUM(cast(b.mainnt as int))和SUM(1 - cast(b.mainnt as int))

Answer 3

你可以使用旋轉功能。

select Funder, 
UNITSMAINT+UNITSNOTMAINT as UNITS, 
UNITSMAINT, 
    UNITSNOTMAINT 
    from 
(
SELECT 
a.new_funderidname as Funder,b.Maint 
FROM new_dealsheet a 
LEFT JOIN salesorder B ON a.new_dsheetid = B.salesorderid 
WHERE a.New_PassedToAdmin = 1 
) 
PIVOT 
    (
    count(b.Maint) 
    For(1 as UNITSMAINT,0 as UNITSNOTMAINT) 
    ); 

參考Pivot function