我想将这个表规范化为 3NF
-----------------------------------
| | | |
| V V V
----------------------------------------------------------------------------------------------------------
|user_name|post_id|post_title|post_text|post_submitted_time|comment_id|comment_text|submited_comment_time|
----------------------------------------------------------------------------------------------------------
| | ^ ^ ^
| | | | |
-------------------------------------------------------------------------------------------
我怎样才能完成这项工作?
最佳答案
假设 user_name 是一个 PK。
------------------------------------------------------------ |post_id|post_title|post_text|post_submitted_time|user_name| ------------------------------------------------------------ 1 foo bar 08:15 baz ------------------------------------------------------------------ |comment_id|comment_text|submitted_comment_time|user_name|post_id| ------------------------------------------------------------------ 1 blabla 13:37 anyname 1 2 foobar 13:38 anyname 1
关于database - 规范化一张表,我们在Stack Overflow上找到一个类似的问题: https://stackoverflow.com/questions/16627608/