unique-constraint

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Add a unique constraint of a sql table as foreign key reference to an another sql table

how to add a unique constraint of asql table as foreig开发者_如何学运维n key referenceto an another sql table in sql server 2005 In order to add FK constraint (in child table to parent table) you have[详细]

2023-01-26 11:49 分类：问答
Best way to handle unique constraints when using Entity Framework

I\'m using Entity Framework 4.0 to access data in a table with a unique column constraint.If the constraint is violated, an exception occurs when I call SaveChanges(), as expected.My que开发者_如何学运[详细]

2023-01-23 00:20 分类：问答
Entity data model, unique index

In my entity data model I have an entity with one property as the primary key and another property that will have unique values too, so I’d like to create a unique index on that 开发者_开发技巧other[详细]

2023-01-21 17:54 分类：问答
How to enforce unique constraint with LINQ to SQL

I\'d like to enforce a unique constraint on two columns with LINQ to SQL. I have got a constraint configured on a SQL table, but is there a way to use it with LINQ to SQL?[详细]

2023-01-21 16:03 分类：问答
Increment field with not null and unique constraint in PostgreSQL 8.3

I have a table \"items\" with a column \"position\". position has a unique and not-null constraint. In order to insert a new row at position x I first try increment the positions of the subsequent ite[详细]

2023-01-21 07:00 分类：问答
SQL table normalization: Simple question about restricting record participation in a many to many relation

If you have the following tables and relations: A Product table A Price Point table (one or more prices for a product)[详细]

2023-01-21 05:16 分类：问答
UNIQUE constraint controlled by a bit column

I have a table, something like FieldsOnForms( FieldID int (FK_Fields) FormID int (FK_Forms) isDeleted bit[详细]

2023-01-21 04:00 分类：问答
accepts_nested_attributes and validates_uniqueness_of

The central problem: How do you merge attribute collections by a key during mass assignment from a nested form.[详细]

2023-01-19 20:47 分类：问答
Entity Framework: How to properly handle exceptions that occur due to SQL constraints

I use Entity Framework to access my SQL data. I have some constraints in the database schema and I wonder how to handle exceptions that are caused by these constraints.[详细]

2023-01-15 15:15 分类：问答
1->1/1->N relationship in Oracle?

I have 2 tables T_Foo foo_id fooHeader T_FooBodys foo_id foobody foo_id are primary key for both of their respective tables. In second table, foo_id is foreign key to first table. I generate the P[详细]

2023-01-14 08:13 分类：问答