Question

我不明白为什么这个查询不起作用。

在3x服务器上运行的原始查询。

def max_even (xs):
  if not xs:
    return 0
  elif xs[0] % 2 == 0:
    return max(xs[0], max_even(xs[1:]))
  else:
    return max_even(xs[1:])

print(max_even([]))                 # 0
print(max_even([2,1,4,3]))          # 4
print(max_even([2,1,4,3,5,99,8,6])) # 8

在开发服务器上，SELECT ( SELECT to_char(RTRIM(XMLAGG(XMLELEMENT(e, TEXT, ',').EXTRACT('//text()')).GetClobVal(), ',')) CM_LINES FROM ( SELECT DISTINCT to_char(cmline) TEXT FROM CCP.comms_matrix_data WHERE comms_matrix_id = :pkid AND src_net = t1.SRC_NET AND dst_net = t1.DST_NET ORDER BY cmline ) ) CM_LINES ,t1.SRC_NET ,t1.DST_NET ,t1.SRC_NETZONE ,t1.DST_NETZONE ,t1.RPA ,t1.RPN FROM CCP.comms_matrix_data t1 WHERE (t1.COMMS_MATRIX_ID = :pkid) AND (LOWER(t1.STATUS) LIKE '%implement%') GROUP BY t1.SRC_NET ,t1.DST_NET ,t1.SRC_NETZONE ,t1.DST_NETZONE ,t1.RPA ,t1.RPN

出现此错误在我的开发服务器上它不起作用所以我决定将查询重写为：

ORA-00904: "T1"."DST_NET": invalid identifier
00904. 00000 -  "%s: invalid identifier"

在dev服务器上使用SELECT CM_LINES.CM_LINES ,t1.SRC_NET ,t1.DST_NET ,t1.SRC_NETZONE ,t1.DST_NETZONE ,t1.RPA ,t1.RPN FROM CCP.comms_matrix_data t1, ( SELECT to_char(RTRIM(XMLAGG(XMLELEMENT(e, TEXT, ',').EXTRACT('//text()')).GetClobVal(), ',')) CM_LINES, src_net, dst_net FROM ( SELECT DISTINCT to_char(cmline) TEXT, src_net, dst_net FROM CCP.comms_matrix_data WHERE comms_matrix_id = :pkid ORDER BY cmline ) ) CM_LINES WHERE (t1.COMMS_MATRIX_ID = :pkid) AND (LOWER(t1.STATUS) LIKE '%implement%') AND CM_LINES.src_net = t1.SRC_NET AND CM_LINES.dst_net = t1.DST_NET GROUP BY CM_LINES.CM_LINES ,t1.SRC_NET ,t1.DST_NET ,t1.SRC_NETZONE ,t1.DST_NETZONE ,t1.RPA ,t1.RPN;

时出现此错误

@Gordon

更新

ORA-00937: not a single-group group function
00937. 00000 -  "not a single-group group function"

更新2

如果我尝试以下操作，我会在SELECT x.CM_LINES ,t1.SRC_NET ,t1.DST_NET ,t1.SRC_NETZONE ,t1.DST_NETZONE ,t1.RPA ,t1.RPN FROM CCP.comms_matrix_data t1 JOIN ( SELECT to_char(RTRIM(XMLAGG(XMLELEMENT(e, cml.TEXT, ',').EXTRACT('//text()')).GetClobVal(), ',')) CM_LINES ,src_net ,dst_net FROM ( SELECT DISTINCT to_char(cmline) TEXT ,src_net ,dst_net FROM CCP.comms_matrix_data WHERE comms_matrix_id = :pkid ORDER BY cmline ) cml ON cml.src_net = t1.SRC_NET /* sql developer reports problem here*/ AND cml.dst_net = t1.DST_NET WHERE t1.COMMS_MATRIX_ID = :pkid AND LOWER(t1.STATUS) LIKE '%implement%' GROUP BY src_net ,dst_net ) x GROUP BY x.CM_LINES ,t1.SRC_NET ,t1.DST_NET ,t1.SRC_NETZONE ,t1.DST_NETZONE ,t1.RPA ,t1.RPN;

上收到错误

ORA-00905: missing keyword
00905. 00000 -  "missing keyword"

Answer 1

子查询中需要GROUP BY：

SELECT CM_LINES, t1.SRC_NET, t1.DST_NET,
       t1.SRC_NETZONE, t1.DST_NETZONE, t1.RPA, t1.RPN
FROM CCP.comms_matrix_data t1 JOIN
     (SELECT to_char(RTRIM(XMLAGG(XMLELEMENT(e, TEXT, ',').EXTRACT('//text()')).GetClobVal(), ',')) as CM_LINES,
             src_net, dst_net
      FROM (SELECT to_char(cmline) as TEXT, src_net, dst_net,
                   ROW_NUMBER() OVER (PARTITION BY src_net, dst_net ORDER BY cmline DESC) as seqnum
            FROM CCP.comms_matrix_data
            WHERE comms_matrix_id = :pkid
           ) CM_LINES
           ON CM_LINES.src_net = t1.SRC_NET AND
               CM_LINES.dst_net = t1.DST_NET AND
               seqnum = 1
      WHERE t1.COMMS_MATRIX_ID = :pkid AND
            LOWER(t1.STATUS) LIKE '%implement%'
      GROUP BY src_net, dst_net
     ) x
GROUP BY CM_LINES, t1.SRC_NET, t1.DST_NET
         t1.SRC_NETZONE, t1.DST_NETZONE, t1.RPA, t1.RPN;

XMLAGG()是一个聚合函数。

oracle不是具有嵌套查询功能的组

1 个答案: