使用計數函數SQL

好吧我試圖用這個計數函數來計算case語句的不同部分。這是現在的工作代碼。它會告訴我某年某人在學校上學的年份。學年如何分解是200703是07年夏季，200801是07年秋季，200802是春季08.因此，案例陳述給了我一個學生開始的學術學年。我只需要一個簡單的方法來計算每個學年有多少個一年級學生。我嘗試在case語句中使用Count，並嘗試設置不同的方法來計算它，但總是遇到聚合函數錯誤。任何幫助都會很棒。我在SQL Server寫這篇2008 R2使用計數函數SQL

SELECT DISTINCT dbo.student_crs_hist.id_num, 
    sum(dbo.student_crs_hist.credit_hrs) as 'tot_credit_hrs', 
    min(dbo.student_crs_hist.yr_cde+dbo.STUDENT_CRS_HIST.TRM_CDE) as 'first_year', 
    'Year' = CASE 
    WHEN min(dbo.student_crs_hist.yr_cde+dbo.STUDENT_CRS_HIST.TRM_CDE)in ('200703','200801','200802') Then '20007-2008' 
    WHEN min(dbo.student_crs_hist.yr_cde+dbo.STUDENT_CRS_HIST.TRM_CDE)in ('200803','200901','200902') Then '20008-2009' 
    WHEN min(dbo.student_crs_hist.yr_cde+dbo.STUDENT_CRS_HIST.TRM_CDE)in ('200903','201001','201002') Then '20009-2010' 
    WHEN min(dbo.student_crs_hist.yr_cde+dbo.STUDENT_CRS_HIST.TRM_CDE)in ('201003','201101','201102') Then '2010-2011' 
    Else '2011-2012' 
    END 
FROM dbo.student_crs_hist, 
    dbo.degree_history 
WHERE dbo.student_crs_hist.id_num = dbo.degree_history.id_num and 
     ((dbo.STUDENT_CRS_HIST.YR_CDE in ('2007') and dbo.STUDENT_CRS_HIST.TRM_CDE in ('03')) OR 
     (dbo.student_crs_hist.yr_cde in ('2008','2009','2010','2011') AND dbo.student_crs_hist.trm_cde in ('01','02','03'))OR 
     (dbo.STUDENT_CRS_HIST.YR_CDE in ('2012') and dbo.STUDENT_CRS_HIST.TRM_CDE in ('01','02'))) and 
     dbo.student_crs_hist.transaction_sts in ('C','H') AND 
     dbo.student_crs_hist.grade_cde in ('A','B','C') AND 
     dbo.degree_history.major_1 = 'ASBD' and 
     dbo.student_crs_hist.adv_req_cde not in ('COL081','EGL082','EGL092','EGL093','MAT091','MAT092','MAT093','COM091','EGL100','REA100') 
Group By 
    dbo.STUDENT_CRS_HIST.ID_NUM 
Having 
    sum(dbo.student_crs_hist.credit_hrs) >= '30' and 

    (min(dbo.student_crs_hist.yr_cde+dbo.STUDENT_CRS_HIST.TRM_CDE) = '200703' or 
    min(dbo.student_crs_hist.yr_cde) in ('2008','2009','2010','2011') or 
    MIN(dbo.student_crs_hist.yr_cde+dbo.student_crs_hist.trm_cde) in ('201201','201202')) 
    Order By 
    min(dbo.student_crs_hist.yr_cde+dbo.STUDENT_CRS_HIST.TRM_CDE)

來源

2013-04-03 Caleb Johnson

使用這種整個語句的FROM（）表 - 由然後選擇（去混疊）列和組的計數列 – Randy 2013-04-03 19:16:20

謝謝，完美的工作 – 2013-04-03 19:23:00

試試這個辦法：

... 
SUM(
    CASE WHEN min(dbo.student_crs_hist.yr_cde+dbo.STUDENT_CRS_HIST.TRM_CDE)in ('200703','200801','200802') Then 1 ELSE 0 END 
    ) as FirstYearStudents_07-08 
...

來源

2013-04-03 20:27:57 Chains

使用計數函數SQL

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