unique
Rails 3 uniqueness validation with scope on polymorphic table
I\'ve got the following setup: class Vote < A开发者_StackOverflow中文版ctiveRecord::Base belongs_to :voteable, :polymorphic => :true, :counter_cache => true[详细]
2023-04-13 08:14 分类：问答Unique index not based on words order?
Is it possibile to have a开发者_Go百科 mysql UNIQUE index on a varchar field not based on the words order?[详细]
2023-04-12 15:59 分类：问答Unique constraint in XML Schema
Let\'s say I have following XML开发者_如何学C file: <authors> <author>a1</author>[详细]
2023-04-12 14:36 分类：问答How do I select only the most recent record based on a userid that can be in either of two columns?
I have a messages table that is structured somewhat like this: from|to|date -----------------------------------[详细]
2023-04-12 08:33 分类：问答create app to provide unique id to every client's request
What I know is that I want to create an app running on a linux system, that will gather system\'s information such as mac address, hd&cpu id\'s, OS version and computer\'s name, as well as a times[详细]
2023-04-11 09:30 分类：问答Hibernate: enforcing unique data members
I am having an issue working with Hibernate and enforcing unique data members when inserting. Here are my abridged Entity objects:[详细]
2023-04-10 09:00 分类：问答mySQL - select unique values in two columns
I really can\'t find a simple or even any solution via sql to get unique data from DB (mySQL). I will give a sample (simplified):[详细]
2023-04-10 02:36 分类：问答How to only print lines with unique fields?
For example... if I had a file like this: A16chr1136595888 A0chr1155517200 B16chr143227072 C0chr2055648508[详细]
2023-04-10 02:21 分类：问答Extracting multiple object values
I have an object like this: object[\"key1\"] = \"text1\" object[\"key2\"] = \"text2\" object[\"key3\"] = \"text1\"[详细]
2023-04-09 06:14 分类：问答creating unique yet ordered ,order number for a customer's order
In my java app I need to generate a unique order number for a customer\'s order.I thought the time of creation of order is a good enough unique value.Two orders cannot be created at the same second.[详细]
2023-04-08 15:42 分类：问答
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