entity-attribute-value

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Please Help Me With Mysql Slow Query Analysis

I have this mysql query that I am trying to analyze. It is very slow, the visitor table here is about 50K entries, this query never returns. When I tried an explain statement, I found out that the ind[详细]

2022-12-16 18:34 分类：问答
How does Virtuemart do EAV without using EAV?

I understand the three basic failures in EAV, namely that it takes a lot of work to reassemble the data.However, I want a database where I can add custom fields.A lot of people say that Virtuemart all[详细]

2022-12-15 05:27 分类：问答
dynamic sql pivot table

i hope you can help me with the resolution of this task we have. originally we have these tables: hwtype[详细]

2022-12-14 04:55 分类：问答
Modify automatically an attribute with magento

I want to modify one attribute of my product automatically (code). How could i do that plz? I have seen how to show one attribu开发者_如何学Pythonte, but not how to modify.[详细]

2022-12-13 07:35 分类：问答
Too many tables; MySQL can only use 61 tables in a join

What is the best way to export data from multiple tables in MySQL. I\'m basically working with product details. Say a product has 150 attributes of data.How can I export that in a single row and then[详细]

2022-12-10 11:52 分类：问答
Data Modeling for EAV

How are开发者_JAVA技巧 others using relational modeling tools to map a logical model or one in third normal form to a database that uses EAV?EAV is a non-relational design.You can\'t achieve any norma[详细]

2022-12-10 05:57 分类：问答
SQL Server 'object'/'property' relational tables linking to other tables

Excuse the poor title, i can not think of the correct term. I have a database structure that represents objects, objects have types and properties.[详细]

2022-12-09 22:57 分类：问答
What is the proper name for this table schema?

We have a common database schema that we use for some tables in our system.Them main reason is that we are running a multi-tenant database so not all of our users require the same fields.However, I do[详细]

2022-12-08 01:18 分类：问答