将两个查询的结果合并为一行

Question

我有一个关于 UNION 的查询，要求在一行中输出结果。我尝试使用 group by，但发生错误。也许有一种解决方案可以将当前查询组合成一行？

select a.RecordID, (ACADEMICYEAR(sysdate) - c.year_begin + 1) COURSE, c.year_begin year_begin, c.Name StGroup
from fc_StudentOrders a   
left join fc_OrderTypes b on b.TypeID=a.OrderType   
left join fc_StudentGroups c on c.Code=a.StudentGroupID   
left join RB_DEPARTMENTS d on d.code = c.faculty  
where a.RecordID = 205838 and a.ORDERTYPE IN (15,56,109)
union all 
select a.RecordID, (ACADEMICYEAR(sysdate) - c.year_begin + 1) COURSE, c.year_begin year_begin, c.Name StGroup
from fc_StudentOrders a   
left join fc_OrderTypes b on b.TypeID=a.OrderType   
left join fc_StudentGroups c on c.Code=a.StudentGroupID   
left join RB_DEPARTMENTS d on d.code = c.faculty  
where a.RecordID = 205838 and a.ORDERTYPE IN (1)

结果截图：

Answer 1

如果我没理解错的话，这可能是一种选择：将查询分成两部分（temp1 和 temp2），然后 JOIN 它们：

WITH
   temp1
   AS
      (SELECT a.RecordID,
              (ACADEMICYEAR (SYSDATE) - c.year_begin + 1) COURSE,
              c.year_begin year_begin,
              c.Name StGroup
         FROM fc_StudentOrders a
              LEFT JOIN fc_OrderTypes b ON b.TypeID = a.OrderType
              LEFT JOIN fc_StudentGroups c ON c.Code = a.StudentGroupID
              LEFT JOIN RB_DEPARTMENTS d ON d.code = c.faculty
        WHERE     a.RecordID = 205838
              AND a.ORDERTYPE IN (15, 56, 109)),
   temp2
   AS
      (SELECT a.RecordID,
              (ACADEMICYEAR (SYSDATE) - c.year_begin + 1) COURSE,
              c.year_begin year_begin,
              c.Name StGroup
         FROM fc_StudentOrders a
              LEFT JOIN fc_OrderTypes b ON b.TypeID = a.OrderType
              LEFT JOIN fc_StudentGroups c ON c.Code = a.StudentGroupID
              LEFT JOIN RB_DEPARTMENTS d ON d.code = c.faculty
        WHERE     a.RecordID = 205838
              AND a.ORDERTYPE IN (1))
SELECT a.recordid,
       a.course,
       a.year_begin,
       a.stgroup,
       b.strgoup
  FROM temp1 a
       JOIN temp2 b
          ON     a.recordid = b.recordid
             AND a.course = b.course
             AND a.year_begin = b.year_begin;

Answer 2

您可以先按如下方式简化您的查询

select a.RecordID, (ACADEMICYEAR(sysdate) - c.year_begin + 1) COURSE, c.year_begin year_begin, c.Name StGroup
    from fc_StudentOrders a   
    left join fc_OrderTypes b on b.TypeID=a.OrderType   
    left join fc_StudentGroups c on c.Code=a.StudentGroupID   
    left join RB_DEPARTMENTS d on d.code = c.faculty  
    where a.RecordID = 205838 and a.ORDERTYPE IN (1,15,56,109)

将两个查询的结果合并为一行

Combining the results of two queries into one line

sql

oracle