relational-database

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adding entries to the "Relational" table in entity model? how do i do that?

so the story is very simple. I have one table called Products and another Called categories. In addition, i have another table called ProductCategories that hold the relationship of catetories to the[详细]

2023-03-24 02:49 分类：问答
MySQL querying relational tables

I suppose this is more or less trivial thing but here it goes... I have few relational tables and I\'m trying to retrieve rows depending on 2 values. Here\'s my query so far:[详细]

2023-03-23 19:48 分类：问答
Why are relational databases needed?

Specifically thinking of web apps, (1) why are relationships(ie:foreign keys) in RDBMS even useful? The web apps I write have logic built-in that validates user input against required fields. I see[详细]

2023-03-23 17:17 分类：问答
Keep table downtime to a minimum by renaming old table, then filling a new version?

I have a handful or so of permanent tables that need to be re-built on a nightly basis. In order to keep these tables \"live\" for as long as possible, and also to offer the possibility of having a[详细]

2023-03-23 15:58 分类：问答
How to implement an 'outer join' relationship in SQL Server?

This is a question that\'s probably going to incur the wrath of some DBA types but I\'m gonna ask it anyway!![详细]

2023-03-23 01:21 分类：问答
Matching weighted tags in a closest-first manner

Bit of an open-ended, how would you approach this type of situation, question. I\'m building a system in which the user is asked to select any number of items from a list of categories. For each cate[详细]

2023-03-22 13:57 分类：问答
Is there a free, high-performance, SQL queriable, .NET in-memory RDBMS? [closed]

As it currently stands, this question is 开发者_运维问答not a good fit for our Q&A format. We expect answers to be supported by facts, references,or expertise, but this question will likely so[详细]

2023-03-22 11:18 分类：问答
'Many to two' relationship

I am wondering about a \'many to two\' relationship. The child can be linked to either of two parents, but not both. Is there any way to reinforce this? Also I would like to prevent duplica开发者_如何[详细]

2023-03-22 01:20 分类：问答
Show calculated results on the fly vs. Storing pre-calculated results in a table

I have results that are calculated from multiple rows in many different tables.These results are then displayed in a profile.To show the most current results on request, should i store these results i[详细]

2023-03-21 19:55 分类：问答
Compare strings length equality

I would like to know which of two following operations under indexed varchar field is more efficient (they play as alternatives in my more difficult query):[详细]

2023-03-21 07:15 分类：问答