Question

我需要将逗号分隔的列拆分为行而不影响其他列。

我的桌子......

+-----+--------------+------------+-------------+
| id  | parent_title | account_id |    tags     |
+-----+--------------+------------+-------------+
| 647 | title999     |         64 | 361,381,388 |
| 646 | title998     |         64 | 361,376,388 |
+-----+--------------+------------+-------------+

预期表......

+-----+--------------+------------+------+
| id  | parent_title | account_id | tags |
+-----+--------------+------------+------+
| 647 | title999     |         64 |  361 |
| 647 | title999     |         64 |  381 |
| 647 | title999     |         64 |  388 |
| 646 | title998     |         64 |  361 |
| 646 | title998     |         64 |  376 |
| 646 | title998     |         64 |  388 |
+-----+--------------+------------+------+

Answer 1

获得良好的字符串拆分功能。没有数据库应该没有数据库。

http://www.sqlservercentral.com/articles/Tally+Table/72993/

然后，执行此操作（注意这假设您已经构建了一个字符串拆分函数，它被称为SplitStrings_CLR（））

;with t as
(
    select id = 647, parent_title = 'title999', account_id = 64, tags = '361,381,388' union all
    select id = 646, parent_title = 'title998', account_id = 64, tags = '361,381,388' 
)
select 
    id,
    parent_title,
    account_id,
    x.*
from t
cross apply sysmon.dbo.SplitStrings_CLR(tags, ',') x

Answer 2

使用XML技巧来执行此操作。

SELECT id,
       parent_title,
       account_id,
       Split.a.value('.', 'Int') tags
FROM   (SELECT id,
               parent_title,
               account_id,
               Cast ('<M>' + Replace(tags, ',', '</M><M>') + '</M>' AS XML) AS Data
        FROM   [table]) AS A
       CROSS APPLY Data.nodes ('/M') AS Split(a)

SQLFIDDLE DEMO

以逗号分隔的列为新列的整数

2 个答案: