如果我有2个表必须与标签表具有多对多关系，我是否需要2个中间表？
[英]If I have 2 tables that must have many-to-many relationship to a tags table, do I need 2 intermediate tables?
问题描述
Let's say I have 3 tables - images , videos and tags . 
假设我有3个表格- images ， videos和tags 。 Currently I have only one intermediate table called tag_image which stores the relation between images and tags. 目前，我只有一个名为tag_image中间表，该表存储图像和标签之间的关系。 Do I need a second tag_video intermediate table for the relationships between my videos and tags, or could I alter the tag_image table and make it useable by both? 我是否需要第二个tag_video中间表来了解我的视频和标签之间的关系，还是可以更改tag_image表并使两者均可用？
If I have 2 intermediate tables, would I be able to create a view and display all images AND videos that have a certain tag? 如果我有2个中间表，是否可以创建视图并显示具有特定标签的所有图像和视频？
1 个解决方案
解决方案1
0 2018-07-12 22:19:45
Since there is a many to many relationship you will have to have to a separate table to keep the tag and video relationship. 由于存在多对多关系，因此必须保留单独的表格来保持标签和视频的关系。
Otherwise you will be having repetitive data in the tag_image table. 否则，您将在tag_image表中包含重复数据。
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