Question

我有这个select语句，我希望能够通过row_number（）进行分区，我刚才在前一行中定义了这个。

但我得到“ORA-30483：此处不允许使用窗口功能”。

如何按row_number进行分区？
如果这不可能，我怎么能重写这个“分区依据”声明？

SELECT DISTINCT
       ID "ID",
       career "Career",
       ROW_NUMBER ()
       OVER (PARTITION BY ID, Career
             ORDER BY ID, Career)
           "Row",
       (SUM (some numbers + some numbers)
        OVER (
            PARTITION BY ID,
                         (ROW_NUMBER ()
                          OVER (PARTITION BY ID, Career
                                ORDER BY ID, Career))))
           "All_Units"
FROM   TABLE       a .....

以下是样本。我喜欢做的是通过ID，Row（Row是row_number（）over（按ID划分，职业订单按ID，Career）的“All_Units”列分区。但是我得到“这里不允许窗口函数”错误。所以对于02233445，我希望All_Units按ID和Row进行分区，对于第1行返回251是我想要的答案。

ID          Career     Row  All_Units 
01122334    GR         1    #    
01122334    GR         2    #
02233445    GR         1    251   
02233445    GR         2    100
02233445    LAW        1    251
04323333    GR         1    # 
04323333    GR         2    #

Answer 1

您需要使用子查询来引用另一个窗口函数的结果。像这样（未经测试）：

SELECT DISTINCT
       a.emplid AS "Student ID",
       a.acad_career AS "Acad Career",
       a_row_number AS "Row",
       (SUM (
              (SELECT COALESCE (SUM (i.unt_passd_prgrss), 0)
               FROM   ps_stf_gr_term_vw i
               WHERE  a.emplid = i.emplid AND a.acad_career = i.acad_career)
            + (SELECT COALESCE (SUM (j.unt_trnsfr), 0)
               FROM   ps_stf_gr_trnsfr_v j
               WHERE  a.emplid = j.emplid AND a.acad_career = j.acad_career))
        OVER (PARTITION BY a.emplid, a_row_number))
           AS "All Units"
FROM   (SELECT a.*,
               ROW_NUMBER ()
               OVER (PARTITION BY a.emplid, a.acad_career
                     ORDER BY a.emplid, a.acad_career)
                   AS a_row_number
        FROM   table_a) a

但是，如果我正确理解您的查询目的，这是获得所需结果的一种迂回方式。我通常发现列列表中存在子查询是一个建议，即查询方向不好。

如果目标只是让table中的每一行都包含行号以及传递和传输的单位数，我认为这个查询将是一个更好的设计（虽然它也是未经测试的）。

SELECT a.emplid AS "Student ID",
       a.acad_career AS "Acad Career",
       ROW_NUMBER ()
       OVER (PARTITION BY a.emplid, a.acad_career
             ORDER BY a.emplid, a.acad_career)
           AS "Row",
       COALESCE (unt_passd_prgrss, 0) + COALESCE (unt_trnsfr, 0))
           AS "All Units"
FROM   table_a a
       LEFT JOIN
       (SELECT emplid,
               acad_career,
               COALESCE (SUM (unt_passd_prgrss), 0) AS unt_passd_prgrss
        FROM   ps_stf_gr_term_vw) i
           ON a.emplid = i.emplid AND a.acad_career = i.acad_career
       LEFT JOIN
       (SELECT emplid,
               acad_career,
               COALESCE (SUM (unt_trnsfr), 0) AS unt_trnsfr
        FROM   ps_stf_gr_trnsfr_v) j
           ON a.emplid = j.emplid AND a.acad_career = j.acad_career

然而，虽然这些解决方案在语法上应该是正确的，但我不相信它们会产生您想要的结果。我没有足够的信息来制作它。

oracle sql - 如何通过row_number进行分区

1 个答案: