我的 SQL 代码没有提供我需要的所有数据

Question

select distinct  
    max(A.awardyear) AS 'Award Year',  
    max(S.SSN) AS 'Student Social Security Number',  
    max(S.firstname) AS 'Student First Name',  
    max(S.lastname) AS 'Student Last Name',  
    max(D.birthdate) as 'Student Date of Birth',  
    max(M.OPEID) as 'Instituion Code',  
    max(M.Schoolname) as 'Institution Name',  
    max(Q.programtitle) as 'Program Name',   
    max(Q.CIPCode) as 'CIPCode',  
    max(Q.[Award Document]) as 'Credential Level',  
    case  
       WHEN q.[Award Document] = 'diploma'  
         then '01'  
       else '02'  
    end,  
    max(I.[1stSite]) as 'Medical or Dental internship',  
    min(A.AYStartDate) as 'Program attendance begin date',  
    max(y.EnStatus) as 'Program attendance status',  
    max(y.NewGradDate) as 'Program attendance status date',  
    case  
       when y.NewGradDate > '2009-06-30'  
         then '2009-06-30'  
         else y.NewGradDate  
    end,  
    min(A.AYStartDate) as 'program attendance begin date for this award year',  
    max(R.programtotal) as 'Tuition & fees',  
    max(R.AYSupplies + R.AYBooks + R.AYUniform) as 'allowance for books, supplies,      and equipment',  
    max(P.programlength) as 'Length of GE program'  
from 
    studentinfo s  
inner join 
    awardletter a ON A.studentid = S.studentid  
inner join 
    budget r on A.budgetid = r.budgetid  
inner join 
    studentdata d on D.studentid = s.studentid  
inner join 
    TranscriptInformation t on t.studentid = s.studentid  
inner join 
    attendance e on e.studentid = s.studentid  
inner join 
    ProgLengthCalc p on p.studentid = s.studentid  
inner join 
    programs q on q.program = p.program  
inner join 
    Schools m on m.school = s.school  
inner join 
    enrollmentinformation y on y.studentid = s.studentid  
left join 
    internship i on i.studentid = s.studentid  
where 
    A.awardyear = '08/09'  
group by 
    a.awardyear, a.awardyear, s.ssn, s.firstname, s.lastname, d.birthdate, 
    m.opeid, m.schoolname, q.programtitle, q.cipcode, q.[Award Document], 
    i.[1stSite], a.aystartdate, y.EnStatus, y.NewGradDate, e.date, 
    r.programtotal, r.AYSupplies + r.aybooks + r.ayuniform, p.programlength  

发生的情况是我的代码仅返回 18 行，而实际上仅在 08/09 颁奖年就有 2,000 多行。我需要这个密集的代码来工作到 13/14 的所有奖励年份，但事实并非如此。

我不确定我在代码中设置的限制是否为 18 行。我对 SQL Server Management Studio 还很陌生，我知道有大量的内部连接，但我需要它们来处理如此密集的数据量。

有什么建议吗？提前谢谢！

Answer 1

您正在选择每个的最大值。因此，在您上面的代码中，您有 18 个 select max 语句。它从每列的 2000 行左右中获取最大值，从而为您提供 18 列。尝试删除最大值。