Top "Constraints" questions

A constraint is a condition that has to be fulfilled in a given context.

How to give a unique constraint to a combination of columns in Oracle?

I have a Table with 4 Columns Each Column will be A,B,C,D Column A is the Primary key. …

sql oracle constraints unique-constraint composite-key
Rename a constraint in SQL Server?

Is it possible to rename a constraint in SQL Server? I don't want to have to delete and create a …

sql sql-server constraints
Inherit from a generic base class, apply a constraint, and implement an interface in C#

This is a syntax question. I have a generic class which is inheriting from a generic base class and is …

c# generics inheritance interface constraints
Auto Layout to dynamically size uilabel width

So I have two UILabels side by side in Storyboard. The second label should butt up against the right edge …

ios storyboard constraints autolayout
Postgres: Add constraint if it doesn't already exist

Does Postgres have any way to say ALTER TABLE foo ADD CONSTRAINT bar ... which will just ignore the command if …

sql postgresql constraints
UICollection View Adjust Cell Size for Screen Size

Currently i have a collection view which takes up most of my screen at the 3.5 inch screen size.The collection …

ios objective-c constraints uicollectionview uicollectionviewcell
Generic constraints, where T : struct and where T : class

I would like to differentiate between following cases: A plain value type (e.g. int) A nullable value type (e.…

c# generics class struct constraints
How can I create a SQL unique constraint based on 2 columns?

I have a Table like this one: |UserId | ContactID | ContactName --------------------------------------- | 12456 | Ax759 | Joe Smith | 12456 | Ax760 | Mary Smith | 12458 | Ax739 | Carl Lewis | 12460 | …

sql-server sql-server-2005 sql-server-2008 constraints unique-constraint
Auto Layout (Constraints) Center 2 side by side views in a parent view

I'm trying to figure out how to do this with auto layout (iOS6) and constraints. Basically I have my large …

iphone ios constraints autolayout
How can I change constraints priority in run time

I have a view which has dynamic height and I am trying to change this view height priority in run …

ios objective-c autolayout constraints