Question

我有2张桌子

标题表，

Id Name  Value
1  Test1 Value1
2  Test2 Value2

评论表，

Id Comments comments_type CREATE_DTE 
1  Testing   CLOSE         03/15/2017
1  Testing   RESEARCH      03/15/2017
1  Testing2  CLOSE         03/17/2017
2  Testing3  CLOSE         03/12/2017
2  Testing4  RESEARCH      03/16/2017

现在我已经为comments表编写了一个聚合查询，以根据ID合并行。

SELECT LISTAGG(COMMENTS, ';') WITHIN GROUP (ORDER BY CREATE_DTE DESC) 
FROM COMMENTS_TBL GROUP BY ID

但是如何加入这两个表并获得所需的输出，

ID Name   Value  CLOSE_Comments    Res_COMMENTS
1  Test1  value1 Testing2 ;Testing  Testing
2  Test2  value2 Testing3           Testing4

Answer 1

请在下面找到更新的查询。由于您已更改了我已进行更改的要求，因此在旧查询本身的顶部包含新列。

更新将INNER JOIN替换为LEFT OUTER JOIN以处理无评论方案

SELECT HEADER_TBL.ID
    , HEADER_TBL.NAME
    , HEADER_TBL.VALUE
    , CLOSE_TYPE.CMTS CLOSE_CMTS
    , RESEARCH_TYPE.CMTS RESEARCH_CMTS
FROM HEADER_TBL 
  LEFT OUTER JOIN (
    SELECT ID
        , LISTAGG(COMMENTS, ';') WITHIN GROUP (ORDER BY CREATE_DTE DESC) CMTS
    FROM COMMENTS_TBL
    WHERE COMMENTS_TYPE = 'CLOSE'
    GROUP BY ID
) CLOSE_TYPE
    ON HEADER_TBL.ID = CLOSE_TYPE.ID
  LEFT OUTER JOIN (
    SELECT ID
        , LISTAGG(COMMENTS, ';') WITHIN GROUP (ORDER BY CREATE_DTE DESC) CMTS
    FROM COMMENTS_TBL
    WHERE COMMENTS_TYPE = 'RESEARCH'
    GROUP BY ID
) RESEARCH_TYPE
    ON HEADER_TBL.ID = RESEARCH_TYPE.ID;

在oracle中合并一对多关系表

1 个答案: