Question

这是我目前的询问：

select C.ACCOUNTNO,C.CONTACT,KEY1,KEY4 from contact1 C
left join CONTSUPP CS on C.accountno=CS.accountno
where 
C.KEY1!='00PRSP' 
AND (C.U_KEY2='2009 FALL' 
    OR C.U_KEY2='2010 SPRING' 
    OR C.U_KEY2='2010 J TERM' 
    OR C.U_KEY2='2010 SUMMER')

现在，我有另一个表（CONTSUPP），其中包含CONTACT1中每条记录的多个详细记录。例如 - 高中GPA，SAT，ACT等。我需要将这些值拉到与我的contact1结果相同的行中 - 但是根据列中的信息确定列标题。例如，我知道我可以这样做：

select C.ACCOUNTNO,C.CONTACT,KEY1,KEY4,STATE from contact1 C
left join CONTSUPP CS on C.accountno=CS.accountno
where 
C.KEY1!='00PRSP' 
AND (C.U_KEY2='2009 FALL' 
    OR C.U_KEY2='2010 SPRING' 
    OR C.U_KEY2='2010 J TERM' 
    OR C.U_KEY2='2010 SUMMER')

不要问为什么（请） - 但是州持有等级值。问题是，这给了我成绩而不知道什么类型的成绩，所以我需要做这样的事情（伪）：

select C.ACCOUNTNO,C.CONTACT,C.KEY1,C.KEY4,
  STATE as GPA when CS.CONTACT='High School'
  STATE as SAT when CS.CONTACT='Test/SAT'
  ..
from contact1 C
left join CONTSUPP CS on C.accountno=CS.accountno
where 
C.KEY1!='00PRSP' 
AND (C.U_KEY2='2009 FALL' 
    OR C.U_KEY2='2010 SPRING' 
    OR C.U_KEY2='2010 J TERM' 
    OR C.U_KEY2='2010 SUMMER')

帮助？

Answer 1

select 
    C.ACCOUNTNO,
    C.CONTACT,
    C.KEY1,
    C.KEY4,  
    HichschoolCS.State as HighSchool,  
    TestSatCS.state as Test


from 
    contact1 C
    left join CONTSUPP HichschoolCS on C.accountno=HichschoolCS.accountno 
        and HichschoolCS.contact = 'High School'
    left join CONTSUPP TestSatCS on C.accountno=TestSatCS.accountno 
        and TestSatCS.contact = 'Test/SAT'
where 
    C.KEY1!='00PRSP' 
    AND (C.U_KEY2='2009 FALL' 
    OR C.U_KEY2='2010 SPRING' 
    OR C.U_KEY2='2010 J TERM' 
    OR C.U_KEY2='2010 SUMMER')

更新：添加了仅使用最高SAT分数的示例

select 
    C.ACCOUNTNO,
    C.CONTACT,
    C.KEY1,
    C.KEY4,  
    HichschoolCS.State as HighSchool,  
    TestSatCS.state as Test


from 
    contact1 C
    left join CONTSUPP HichschoolCS on C.accountno=HichschoolCS.accountno 
        and HichschoolCS.contact = 'High School'
    left join (SELECT MAX(state) state, 
        accountno
        FROM
            CONTSUPP TestSatCS 
        WHERE 
            contact = 'Test/SAT'
        GROUP
            accountno) TestSatCS
    on C.accountno=TestSatCS.accountno 

where 
    C.KEY1!='00PRSP' 
    AND (C.U_KEY2='2009 FALL' 
    OR C.U_KEY2='2010 SPRING' 
    OR C.U_KEY2='2010 J TERM' 
    OR C.U_KEY2='2010 SUMMER')

SQL - 在Join中抓取详细信息行作为列

1 个答案: