constraints

I am working on an ios application. I am adding the auto-layout programmatically to 2 labels. I need to add a constraint to make them equal width. I know how to fix the width of a label by using : constraint = [NSLayoutConstraint constraintWithItem:myLabel attribute:NSLayoutAttributeWidth relatedBy:NSLayoutRelationEqual toItem: nil attribute:NSLayoutAttributeNotAnAttribute multiplier:1.0f constant:200.0f]; That would fix the label size to a constant. But I have 2 labels and I want them to have equal size without having to set a constant. Youssef It turned out I just have to do the following:

I have a few non-unique constraints that I want to alter into unique constraints ( business rules have changed since the data model was made ). Is there any way to do it with out dropping and recreating as a unique constraint? I was thinking there would be an option in the alter constraint command, but I have not found anything. Thanks!! You can't modify a constraint in the way you wish you can only drop and recreate it. If you want to do this with no downtime then look into the DBMS_REDEFINITION package. You cannot convert a non-unique index into a unique index. (It's difficult to say what

I have a custom UITableViewCell which has a thumbnail and bunch of text. The row height is configured to be calculated automatically using tableView.estimatedRowHeight = 129; tableView.rowHeight = UITableViewAutomaticDimension The row height should be calculated as exactly 138 points. Everything looks great on the iPhone 5. However, on iPhone 6 Plus, the auto row height fails INTERMITTENTLY for random rows with the following log. ( "<NSLayoutConstraint:0x17009ddd0 V:|-(20)-[scoop.ThumbnailImage:0x124d2a5a0] (Names: '|':UITableViewCellContentView:0x124e23200 )>", "<NSLayoutConstraint

I want to implement the following constraints in mysql: create table TypeMapping( ... constraint unique(server_id,type_id), constraint foreign key(server_id) references Server(id), constraint foreign key(type_id) references Type(id) ); This throws a 'ERROR 1062 (23000): Duplicate entry '3-4' for key 'server_id'' when I issue an insert/update that would break the constraint. Is this type of constraint even possible? If so how? Thank you. Yes, that is perfectly valid. Make sure you understand that the composite unique constraint will only break when you try to insert a new row in TypeMapping ,

I have a function in R that I wish to maximise subject to some simple constraints in optim or constrOptim , but I'm struggling to get my head around ci and ui to fit my constraints. My function is: negexpKPI <- function(alpha,beta,spend){ -sum(alpha*(1-exp(-spend/beta))) } where alpha and beta are fixed vectors, and spend is a vector of spends c(sp1,sp2,...,sp6) which I want to vary in order to maximise the output of negexpKPI . I want to constrain spend in three different ways: 1) Min and max for each sp1,sp2,...,sp6 , i.e 0 < sp1 < 10000000 5000 < sp2 < 10000000 ... 2) A total sum: sum(spend

Working in MS2000, I have a table called JobOwners that maps Jobs (JPSID) to the Employees that own them (EmpID). It also contains the date they started owning that job (DateStarted), date they stopped owning that job (DateEnded) and if the ownership is active (IsActive). Looks like this. CREATE TABLE JobOwners ( LogID int NOT NULL IDENTITY(1,1) PRIMARY KEY, JPSID int NOT NULL FOREIGN KEY REFERENCES JobsPerShift(JPSID), EmpID int NOT NULL FOREIGN KEY REFERENCES Employees(EmpID), DateStarted datetime, DateEnded datetime, IsActive tinyint NOT NULL ) There should be no duplicates of JPSID that