1

两个子选择都可以独立运行。

但我希望加入他们，这总是给出“ORA-00918：列不明确定义”。我不明白为什么？

两个子选举都使用其他名称。

SELECT *
  FROM    (SELECT aods.user_id,
                  aods.firstname,
                  aods.lastname,
                  Aods.DEPARTMENT,
                  cods.jc_name
             FROM    personas aods
                  LEFT JOIN
                     user_jc cods
                  ON aods.user_id = cods.user_id
            WHERE cods.jc_name LIKE '%ADM%') ods
       FULL OUTER JOIN
          (SELECT abl.user_id,
                  abl.firstname,
                  abl.lastname,
                  Abl.DEPARTMENT,
                  bbl.ug_name
             FROM    personas abl
                  LEFT JOIN
                     ru_ug bbl
                  ON abl.user_id = bbl.user_id
            WHERE Bbl.UG_NAME LIKE '%ADM%'
                  AND bbl.rss_name = 'TIR') bl
       ON ods.user_id = bl.user_id
4

2 回答 2

6

因为你select *在顶部做了一个。

user_id
firstname
lastname
DEPARTMENT

两个子查询中都存在，并且select *它会得到两个具有相同名称的列。

如果你想合并两个子查询（这样结果的列集就是user_id, firstname, lastname, DEPARTMENT, jc_name, ug_name），你应该做一个自然连接：

SELECT *
  FROM (SELECT aods.user_id, aods.firstname, aods.lastname, aods.department,
               cods.jc_name
          FROM personas aods LEFT JOIN user_jc cods
               ON aods.user_id = cods.user_id
         WHERE cods.jc_name LIKE '%ADM%') ods
       NATURAL JOIN
       (SELECT abl.user_id, abl.firstname, abl.lastname, abl.department,
               bbl.ug_name
          FROM personas abl LEFT JOIN ru_ug bbl ON abl.user_id = bbl.user_id
         WHERE bbl.ug_name LIKE '%ADM%' AND bbl.rss_name = 'TIR') bl

相反，如果您想要所有不同的列，您应该明确列出它们：

 SELECT ods.user_id, ods.firstname, ods.lastname, ods.department, ods.jc_name,
        bl.user_id, bl.firstname, bl.lastname, bl.department, bl.ug_name
   FROM (SELECT aods.user_id, aods.firstname, aods.lastname, aods.department,
                cods.jc_name
           FROM personas aods LEFT JOIN user_jc cods
                ON aods.user_id = cods.user_id
          WHERE cods.jc_name LIKE '%ADM%') ods
        FULL OUTER JOIN
        (SELECT abl.user_id, abl.firstname, abl.lastname, abl.department,
                bbl.ug_name
           FROM personas abl LEFT JOIN ru_ug bbl ON abl.user_id = bbl.user_id
          WHERE bbl.ug_name LIKE '%ADM%' AND bbl.rss_name = 'TIR') bl
        ON ods.user_id = bl.user_id

在您的评论中，您说您想nvl()在每列上使用外部连接。对我来说它工作正常：

SELECT NVL (ods.user_id, bl.user_id), NVL (ods.firstname, bl.firstname),
       NVL (ods.lastname, bl.lastname), NVL (ods.department, bl.department),
       ods.jc_name, bl.ug_name
  FROM (SELECT '1' user_id, 'ods2' firstname, NULL lastname,
               'ods3' department, 'ods4' jc_name
          FROM DUAL) ods
       FULL OUTER JOIN
       (SELECT '1' user_id, NULL firstname, 'bl2' lastname, 'bl3' department,
               'bl4' ug_name
          FROM DUAL) bl ON ods.user_id = bl.user_id

你在做一些额外的东西，比如order by？

于 2012-02-06T11:01:01.813 回答
0

指定列名：

SELECT ods.*, bl.*
  FROM    (SELECT aods.user_id,
                  aods.firstname,
                  aods.lastname,
                  Aods.DEPARTMENT,
                  cods.jc_name
             FROM    personas aods
                  LEFT JOIN
                     user_jc cods
                  ON aods.user_id = cods.user_id
            WHERE cods.jc_name LIKE '%ADM%') ods
       FULL OUTER JOIN
          (SELECT abl.user_id,
                  abl.firstname,
                  abl.lastname,
                  Abl.DEPARTMENT,
                  bbl.ug_name
             FROM    personas abl
                  LEFT JOIN
                     ru_ug bbl
                  ON abl.user_id = bbl.user_id
            WHERE Bbl.UG_NAME LIKE '%ADM%'
                  AND bbl.rss_name = 'TIR') bl
       ON ods.user_id = bl.user_id

也许您希望 UNION 如下 [或 UNION ALL]：

  SELECT aods.user_id,
          aods.firstname,
          aods.lastname,
          Aods.DEPARTMENT,
          cods.jc_name
     FROM    personas aods
          LEFT JOIN
             user_jc cods
          ON aods.user_id = cods.user_id
    WHERE cods.jc_name LIKE '%ADM%'

UNION SELECT abl.user_id, abl.firstname, abl.lastname, Abl.DEPARTMENT, bbl.ug_name FROM personas abl LE​​FT JOIN ru_ug bbl ON abl.user_id = bbl.user_id WHERE Bbl.UG_NAME LIKE '%ADM%' AND bbl.rss_name ='TIR'

于 2012-02-06T19:32:03.613 回答