我的刑期有问题。 我的美术馆属于一个类别(实体)。 然后,我有实体的美术馆,并储存了用于特定陶瓷的图像。 美术馆可以有多种图像,但如不出现图像,则可能还会有彩色(尚未添加任何图像)。
现在,我想在挑选有一个或多个图像并属于某些类别的美术馆时,打上Kingk。
类别(同上,姓名)
美术(id,姓名,类别:id)
食堂(id, gallery_id, path)
Category -> Gallery (one to many) Gallery -> GalleryImages (one to many)
引证:
SELECT *
FROM Gallery as G
WHERE
G.category_id = 1
AND G.id in (SELECT gallery_id FROM GalleryImages )
将1改为“护理”,即请你选择。
Hmm - looks like the basic question has already been answered. But your setup bugs me slightly...
I think I d restructure your tables a little bit (Assuming internationalization is not an issue). Among other things, I don t feel there s a fundamental difference between the concepts of Category and Gallery . Now, there may be super and sub categories/galleries, and images may belong to more than one at once (ie, from the Renniasance, by Michaelangelo, sculpture, etc). It s similar to the concept of tags.
我或许会修改你的表格,以便:
Gallery (or Category, if you prefer)
=============
id -- autoincrement
name -- varchar(50) or something, unique
parent -- fk reference to another Gallery.id row, optional
Image
==========
id -- autoincrement
name -- varchar(50) or similar, non-unique
path -- store as URI/URL, unique
description -- varchar(128) or similar
Gallery_Image
===============
galleryId -- fk reference to Gallery.id
imageId -- fk reference to Image.id
-- the pair is unique
Related_Gallery -- optional table
================
galleryId -- fk reference to Gallery.id
relationship -- code, or fk reference to other table
relatedId -- fk reference to Gallery.id
-- entire row should be unique
-- somewhat tricky to use.
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