database-relations

相关标签：javascript jquery android 多少钱 iPhone

Complex Database Relations (Junction Tables)

My Question is about the idea of combining two junction tables into one, for similarly related tables. Please read to see what I mean. Also note that this is indeed a problem I am faced with and there[详细]

2023-04-08 05:48 分类：问答
Assistance with SELECT

I have three tables: hosting_pack, hosting_attr and hosting_attr_value. One hosting_category can have many hosting_packs and many hosting_attributes.[详细]

2023-03-30 23:56 分类：问答
How do handle relations in document stores

I do understand that relations are not really needed in document stores, but for some things they can still be useful. Or am I wrong (snowed in on RDBMS)?[详细]

2023-03-27 06:06 分类：问答
Rails has_many ajax

Lets say I have a recipe that has_many ingredients, I want the recipe creating page to have forms for each ingredient. How can I make it where a user can click a button to add a new ingredient then sa[详细]

2023-03-26 07:15 分类：问答
How to express a One-To-Many relationship in Django?

I\'m defining my Django models right now and I realized that there wasn\'t a OneToManyField in the model field types. I\'m sure there\'s a way to do this, so I\'m not sure what I\'m missing. I essenti[详细]

2023-03-24 18:57 分类：问答
How to set a relation of an object of Core Data entity

I have an entity mainEntity with three one-to-many re开发者_JAVA百科lations to three different entities entity1, entity2 and entity3 (relations are named after objects they\'re referring to).[详细]

2023-03-20 21:32 分类：问答
updating a table fields where fields in table A = fields in table B

HELP! here is my problem i dont know what is going wrong I have 开发者_如何学C2 tables one of sales and other of transactions, the transaction table is the same as the sales table but is very detailed[详细]

2023-03-18 22:16 分类：问答
Organizing database tables - large number of properties

I have a database that stores some users in it. Each user has its account settings, privacy settings and lots of other properties to set. The number of those properties started to grow and I could end[详细]

2023-03-14 10:30 分类：问答
Mapping an relationship without knowledge of concrete class in Hibernate

There are many topics on abstract mapping in Hibernate, but I couldn\'t find something that matches my case.[详细]

2023-03-11 07:37 分类：问答
MySQL: Getting Posts from Categories

I\'m trying to learn MySQL so I have created a little blog system. I have 3 tables in MySQL: posts : id|title[详细]

2023-03-07 17:17 分类：问答