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我想知道在数据库中创建单独的table
正确的timestamp
是否是好的做法。从数据库中的实际表中分离时间戳
我有一个数据库有多个表使用时间戳 - 所有6个相同的字段 - 并想知道,而不是重复这些列,我可以包括我的时间戳表foreign key
。
这是我在简化例如:
用户表:
+----+-----------+-----------------------+
| ID | timestamp | username |
+----+-----------+-----------------------+
| 1 | 1 | [email protected] |
+----+-----------+-----------------------+
| 2 | 2 | [email protected] |
+----+-----------+-----------------------+
| 3 | 3 | [email protected] |
+----+-----------+-----------------------+
| 4 | 4 | [email protected] |
+----+-----------+-----------------------+
| 5 | 4 | [email protected] |
+----+-----------+-----------------------+
Orders表
+----+-----------+--------------------+--------+
| ID | timestamp | ordersBlob | userid |
+----+-----------+--------------------+--------+
| 1 | 6 | some text | 1 |
+----+-----------+--------------------+--------+
| 2 | 7 | more text | 1 |
+----+-----------+--------------------+--------+
| 3 | 8 | no text | 2 |
+----+-----------+--------------------+--------+
| 4 | 9 | irony poining text | 3 |
+----+-----------+--------------------+--------+
| 5 | 10 | paradox text | 4 |
+----+-----------+--------------------+--------+
时间戳表
+----+-----------+-----------+------------+------------+
| ID | createdOn | createdBy | modifiedOn | modifiedBy |
+----+-----------+-----------+------------+------------+
| 1 | 20170616 | 1 | | |
+----+-----------+-----------+------------+------------+
| 2 | 20170621 | 3 | 20170621 | 2 |
+----+-----------+-----------+------------+------------+
| 3 | 20160512 | 4 | | |
+----+-----------+-----------+------------+------------+
| 4 | 20160512 | 4 | 20160516 | 3 |
+----+-----------+-----------+------------+------------+
| 5 | 20160101 | 2 | | |
+----+-----------+-----------+------------+------------+
| 6 | 20160102 | 2 | 20160103 | 3 |
+----+-----------+-----------+------------+------------+
| 7 | 20160103 | 4 | | |
+----+-----------+-----------+------------+------------+
| 8 | 20160104 | 1 | | |
+----+-----------+-----------+------------+------------+
| 9 | 20160105 | 5 | | |
+----+-----------+-----------+------------+------------+
| 10 | 20160106 | 1 | 20160106 | 1 |
+----+-----------+-----------+------------+------------+
这些表仅作为示例。那样可以做那样的事情。如果您能提供反例和原因,您不会那样做,请提供。
希望这不是很多意见的基础。
我没有想到它会减慢我的手术。很好记住!谢谢 – Chax