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Compound key/ Composite Key / Concatenated Key / Aggregate Key / Candidate Key 繁体
2013年06月22 - Can anyone please give me a clear idea of the difference of these keys? 有谁能请我清楚地了解这些键的区别? Compound key Composite Key Concatenated Key Aggr

Is primary key also super key and candidate key? 繁体
2013年02月06 - Is the primary key also a super key and a candidate key? Their definitions are lengthy but I wonder if this is true? 主键是超级密钥还是候选密钥?他们的定义很冗长,但我想知道这是否属实

Sorting Array by Key (Key is a string) 繁体
2014年10月31 - I have a simple Array. The goal is, to sort them ascending by the key. 我有一个简单的数组。目标是通过密钥对它们进行排序。 $someUnsortedArray = array("140/142" => "FirstVal

“Windows” key as part of a shortcut key 繁体
2008年12月30 - I very often open a console window while doing my development. Usually Win+R -> cmd -> enter. However, Windows also lets you add a shortcut key

Primary key and unique key in django 繁体
2011年05月17 - I had a custom primary key that need to be set up on a particular data in a model. 我有一个自定义主键需要在模型中的特定数据上设置。 This was not enough, as an attempt to in

foreign key with 'no foreign key' value 繁体
2015年03月12 - In my application I use MS SQL Server 2008 and Linq-to-SQL. I have two tables: A and B, linked with foreign key: B.AId => A.Id. Is it possible in B

Composite key as foreign key (sql) 繁体
2012年03月19 - here are my two tables of concern: 以下是我的两张关注表: CREATE TABLE IF NOT EXISTS `tutorial` ( `beggingTime` time NOT NULL, `day` varchar(8) NOT NULL,

GROUP BY foreign key or primary key? 繁体
2013年07月22 - I have two tables : 我有两张桌子: user ======= id name class marks ======= id user_id sub_id mark user table contains the details of user (student) mark

Retrieve key from key in dict 繁体
2015年10月19 - I have a class Foo that has an instance string variable id. I implemented the __eq__ and __hash__ magic methods so that they only use id, so a Foo ins

jQuery key code for command key 繁体
2010年09月30 - I have read jQuery Event Keypress: Which key was pressed? and How can i check if key is pressed during click event with jquery? 我读过jQuery Event Keypre


 
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