constraint (1,650)


.net - Update database schema in Entity Framework

.net - Update database schema in Entity Framework

I installed VS SP1 and played around with Entity Framework. I created a schema from an existing database and tried some basic operations. Most of it went well, except the database schema update. I ch…


Are foreign keys really necessary in a database design?

As far as I know, foreign keys(FK) are used to aid the programmer to manipulate data in the correct way. Suppose a programmer is actually doing this in the right manner already, then do we really need…


c# - Is there a constraint that restricts my generic method to numeric types?

Can anyone tell me if there is a way with generics to limit a generic type argument T to only: Int16 Int32 Int64 UInt16 UInt32 UInt64 I'm aware of the where keyword, but can't find an interface for…


Why doesn't C# support implied generic types on class constructors?

C# doesn't require you to specify a generic type parameter if the compiler can infer it, for instance: List<int> myInts=new List<int>{0,1,1, 2,3,5,8,13,21,34,55,89,144,233,377, 610,987,1597…


How do you create a foreign key relationship in a SQL Server CE(Compact Edition) Database?

Visual Studio 2005 doesn't provide an interface for creating relationships between tables in a SQL Server CE database(I'm using version 3.0) and you can't open a Compact Edition DB using Management…


How do I create a foreign key in SQL Server?

I have never "hand-coded" object creation code for SQL Server and foreign key decleration is seemingly different between SQL Server and Postgres. Here is my sql so far: drop table exams; drop table qu…


mysql - In what order are ON DELETE CASCADE constraints processed?

Here is an example of what I've got going on: CREATE TABLE Parent(id BIGINT NOT NULL, PRIMARY KEY(id)) ENGINE=InnoDB; CREATE TABLE Child(id BIGINT NOT NULL, parentid BIGINT NOT NULL, PRIMAR…


SQL Server 2005 How Create a Unique Constraint?

How do I create a unique constraint on an existing table in SQL Server 2005? I am looking for both the TSQL and how to do it in the Database Diagram.…


sql - How would you create a database in microsoft access that is searchable only by certain fields?

How would you create a database in Microsoft Access that is searchable only by certain fields and controlled by only a few(necessary) text boxes and check boxes on a form so it is easy to use-no d…



What datatype should be used for storing phone numbers in SQL Server 2005?

I need to store phone numbers in a table. Please suggest which datatype should I use? Wait. Please read on before you hit reply.. This field needs to be indexed heavily as Sales Reps can use this fie…




key add table foreign sql constraints with multiple how unique