Question

我想连接两个表，其架构如下所示...... !!

Table :

team_posts

  id
  team_id
  text
  location_name
  stars_count
  comments_count
  created_at
  updated_at

team_feed_activites

    id
    team_id
    operation
    created_at
    updated_at

表值为

team_posts

id | team_id | text | location_name | stars_count | comments_count |        created_at      |       updated_at 

1  |    23   | crow |    india      |      1      |       2        |   2016-03-18 06:30:00  |   2016-03-18 06:30:00
2  |    24   | bird |    india      |      1      |       2        |   2016-03-18 06:30:00  |   2016-03-19 06:30:00
3  |    25   | span |    india      |      33     |       2        |   2016-03-18 06:30:00  |   2016-03-18 06:30:00
4  |    25   | bang |    india      |      3      |       2        |   2016-03-18 06:30:00  |   2016-03-12 06:30:00
5  |    27   | crow |    india      |      1      |       2        |   2016-03-18 06:30:00  |   2016-03-18 06:30:00
6  |    23   | crow |    india      |      1      |       2        |   2016-03-18 06:30:00  |   2016-01-18 06:30:00
7  |    23   | crow |    india      |      7      |       2        |   2016-03-18 06:30:00  |   2016-03-18 06:30:00
8  |    23   | hen  |    india      |      1      |       2        |   2016-03-18 06:30:00  |   2016-03-01 06:30:00
9  |    23   | mani |    india      |      1      |       2        |   2016-03-18 06:30:00  |   2016-03-18 06:30:00
10 |    23   | dog  |    india      |      1      |       2        |   2016-03-18 06:30:00  |   2016-03-18 06:30:00
11 |    29   | crow |    india      |      10     |       2        |   2016-03-18 06:30:00  |   2016-02-26 06:30:00
12 |    29   | god  |    india      |      1      |       2        |   2016-03-18 06:30:00  |   2016-03-18 06:30:00
13 |    29   | pen  |    india      |      44     |       2        |   2016-03-18 06:30:00  |   2016-03-25 06:30:00


 team_feed_activites

    id  | team_id |  operation      |   created_at        |         updated_at

    1   |    10   |  established    | 2016-03-18 06:30:00 | 2016-03-18 06:30:00
    2   |    23   |  established    | 2016-03-19 06:30:00 | 2016-03-19 06:30:00
    3   |    23   |    modified     | 2016-03-19 06:30:00 | 2016-03-19 06:30:00
    4   |    24   | captian changed | 2016-03-19 06:30:00 | 2016-03-19 06:30:00
    5   |    23   | captian added   | 2016-03-19 06:30:00 | 2016-03-19 06:30:00
    6   |    27   |      won        | 2016-03-19 06:30:00 | 2016-03-19 06:30:00
    7   |    23   |      won        | 2016-03-19 06:30:00 | 2016-03-19 06:30:00
    8   |    23   |   paricipated   | 2016-03-19 06:30:00 | 2016-03-19 06:30:00
    9   |    23   |       lost      | 2016-03-19 06:30:00 | 2016-03-19 06:30:00
   10   |    23   |   changed pic   | 2016-03-19 06:30:00 | 2016-03-19 06:30:00
   11   |    23   |  addded image   | 2016-03-19 06:30:00 | 2016-03-19 06:30:00
   12   |    30   |  established    | 2016-03-19 06:30:00 | 2016-03-19 06:30:00

现在我需要的是创建一个视图，根据updated_at日期将该表合并到表中。这样我就可以看到每天的团队进展是什么，这样我就可以将其作为团队提供。我可以帮助我一些人如何做到这一点...... !!!在此先感谢.. !!!

Answer 1

使用简单的INNER JOIN组合基于updated_at字段

的两个表中的数据

SELECT * FROM team_posts tp 
   INNER JOIN team_feed_activites tfa ON tp.updated_at = tfa.updated_at;

Answer 2

您可以使用此查询 CREATE OR REPLACE FUNCTION testit() RETURNS NUMERIC AS $BODY$ DECLARE r RECORD; BEGIN FOR r IN SELECT * FROM aropenbal ORDER BY doc_date LOOP UPDATE aropenbal SET paid_amount = ( CASE WHEN (doc_type IN ('C', 'R')) THEN (SELECT COALESCE (SUM (arapply_target_paid)* -1, 0) FROM arapply WHERE arapply_source_docnumber = r.doc_number AND arapply_postdate <= r.doc_date) ELSE (SELECT COALESCE(SUM (arapply_target_paid),0) FROM arapply WHERE arapply_target_docnumber = r.doc_number AND arapply_postdate <= r.doc_date) END) WHERE ar_id = r.ar_id; UPDATE aropenbal SET open_balance = (base_amount - paid_amount) WHERE ar_id = r.ar_id; END LOOP; RETURN (SELECT SUM(open_balance) FROM aropenbal); END; $BODY$ LANGUAGE plpgsql;

但小心使用这会给出重复记录一段时间并为每个字段指定新名称，因为字段中有相同的名称，因此它将替换它

字段名称分配：SELECT tp.field,tfa.field FROM team_posts tp,team_feed_activites tfa

Answer 3

使用LEFT JOIN和RIGHT JOIN进行连接，然后使用UNION ALL加入他们您可以试试这个。

SELECT * 
FROM
(SELECT a.* FROM team_posts a 
       LEFT JOIN 
       team_feed_activities b 
       ON a.updated_at=b.updated_at 
UNION ALL 
SELECT a.* FROM team_posts a 
       RIGHT JOIN 
       team_feed_activities b 
       ON a.updated_at=b.updated_at) subquery 
ORDER BY updated_at DESC

注意：两个（子查询）SELECT列必须具有相同的列数。例如：

SELECT a.*, b.operation

第二，它必须是相同的

SELECT a.*, b.operation或SELECT a.*, b.team_id

只要两个表都显示相同的列数。

Answer 4

我尝试了下面的代码，我接受了输出。

create view team_feed AS
    select tp.id as post_id,
           tp.team_id as post_team_id,
           tp.text,
           tp.location_name,
           tp.stars_count,
           tp.comments_count,
           tp.created_at as post_created_at,
           tp.updated_at as post_updated_at,
           '' as team_feed_activites_id,
           '' as team_feed_activites_team_id,
           '' as team_feed_activites_operation,
           '' as team_feed_activites_created_at,
           '' as team_feed_activites_updated_at,
           tp.updated_at as event_updated_at
    from team_posts as tp
    UNION
    select '' as post_id,
           '' as post_team_id,
           '' as text,
           '' as location_name,
           '' as stars_count,
           '' as comments_count,
           '' as post_created_at,
           '' as post_updated_at,
           tfa.id as team_feed_activites_id,
           tfa.team_id as team_feed_activites_team_id,
           tfa.operation as team_feed_activites_operation,
           tfa.created_at as team_feed_activites_created_at,
           tfa.updated_at as team_feed_activites_updated_at,
           tfa.updated_at as event_updated_at
    from team_feed_activites as tfa

在上面的查询中，我基于表选择将唯一列作为event_updated_at，并将其作为视图。并从以下查询中获取数据。

select post_id,
   post_team_id,
   text,
   location_name,
   stars_count,
   comments_count,
   team_feed_activites_id,
   team_feed_activites_team_id,
   team_feed_activites_operation
from team_feeds
order by event_updated_at ASC

如何使用日期连接两个表，没有任何条件？

4 个答案: