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What are horizontal and vertical partitions in database and what is the difference? 繁体
2013年08月18 - I read that 我读到 SELECT is a horizontal partition of the relation into two set of tuples. SELECT是将关系划分为两组元组的水平分区。 and 和 PROJECT is a vertical partit

Inserting rows in table that has a relationship with another table 繁体
2008年12月08 - In my database schema I have an entity that is identified. The identifier can be reused and thus there is a one-to-many relation with the entity. Exam

MySQL and UNIQUE columns: how to avoid duplicates? 繁体
2017年03月29 - I have a table with the following column: 我有一个包含以下列的表: (id, col_1, col_2) where "id" is the primary key (auto-inc). 其中“id”是主键(auto-inc)。 I would

How can i populate a JTable via a dynamic array or ArrayList fwith values from a database 繁体
2012年11月26 - I have 6 columns and a maximum of about 20 rows in the database. I like to make a general program in Java that populates the JTable with these values.

Is there a way to load a page with Cron Job? 繁体
2012年08月13 - I have created a php file; so every time I run that, it will run copy all the database to a folder inside my host. 我创建了一个php文件;每次运行时,它都会将所有数据库复制到主机内的

Check if a table is empty (MSAccess Database + Delphi) 繁体
2013年10月14 - I need to findout whether a created table has entries in it or not. 我需要找出创建的表是否包含条目。 What I need is, 我需要的是, if (TableIsEmpty) then do_somethin

How to find a string inside a entire database? 繁体
2011年12月08 - I have one specific string, such as "123abcd" for example but I don't know the name of the table or even the name of the column inside the table on my

Writing a control panel script to modify php files 繁体
2009年07月10 - I have a PHP file that contains a lot of "if" and "else" statements that determine what content a user sees (let's called this a block). I constantly

How to get data for specific user, but from different table 繁体
2014年10月20 - I want to display the data for user 1 from database A right after he logged in, right now the page showing all the data from the table. 我想在用户1登录后立即显示来

NHibernate Mapping/Design advice - join tables 繁体
2009年01月11 - I have a design issue that I would appreciate some input on. 我有一个设计问题,我会很感激一些输入。 I would like to make an calendar event system based on the following


 
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