constraints

I'm trying to position 2 UIImage views in the center of the screen, side by side. If it's just 1 UIImage, I can just set them to be vertically and horizontally center in the container. If I have 2 UIImage views side by side, I can only set it to be vertically centered, but not horizontally centered since both UIImage views would stack over each other.. Could someone please guide me ? Thanks and greatly appreciated! Take a view, put both the images inside that view. Add the constraints on those images with respect to the view you made (Edge to edge to the view). Now add the constraints on the

I'm writing some software that requires storing items in a database, the items need to have a 'priority' so we end up with ID | Name | Priority --------+--------------+---------- 1 | Pear | 4 2 | Apple | 2 3 | Orange | 1 4 | Banana | 3 So now, the top priority fruit is the Orange, then Apple then Banana then Pear. Now, I want to make Pear the number one priority so Pear, Orange, Apple, Banana. The table will look like: ID | Name | Priority --------+--------------+---------- 1 | Pear | 1 2 | Apple | 3 3 | Orange | 2 4 | Banana | 4 Whats the best way to achieve this with PHP and Postgres. Given

Sorry in advance if the answer (1) is trivial; or (2) out there but I haven't been able to solve this issue or find and answer online. Any pointers will be much appreciated! I am in need of a piece of code that can run through a vector and return all possible subsets of elements whose cumulative sum passes a threshold value. Note that I do not want only the subsets that give me exactly the threshold. The cumulative sum can be above the threshold, as long as the algorithm stops adding an extra element if the value has been achieved already. # A tiny example of the kind of input data. # However,

I have a view on top of my viewcontroller, its height is 64. I need this view stays same size in all screen size 3.5" , 4" , 4,7" and 5,5". The result I am taking is as in screenshots. What should I do? After fixing height to 64 it looks like this ; Add Fixed Height to your Headerview like this , check in below image . Fix Height of your view Leading : 0 Top : 0 trailing : 0 Pin the height for wAny hAny size classes. 来源： https://stackoverflow.com/questions/36789023/uistoryboard-constraints-on-uiview

Possible Duplicate: The proper way to implement unique constraint that allows multiple NULL values in SQL Server I have a column in my table where all the values must either be unique, or NULL. I tried adding a Unique Key to the table for this column, but this seems to mean I can only have 1 NULL value? How can I set a constraint so that all the values are unique, unless they are NULL? SQL Server 2008 has filtered indexes that allow this but they are not available in 2005. In SQL Server 2005 you can create an indexed view with definition CREATE VIEW dbo.Foo WITH SCHEMABINDING AS SELECT bar