constraints

问题 I want to include a check constraint on a table between the primary key of the latter and the primary key of another table and insert! = Between the two, how can i do it? I've been tempted like this: CREATE TABLE RESPONSABILE( ID_RESP CHAR(10) REFERENCES UTENTE(ID_USER) PRIMARY KEY, CODICE_FISCALE VARCHAR(16) NOT NULL UNIQUE, NOME VARCHAR(15) NOT NULL, COGNOME VARCHAR(15) NOT NULL, CONSTRAINT CK_FI CHECK (REGEXP_LIKE(CODICE_FISCALE,'^[A-Z]{6}[\d+]{2}[ABCDEHLMPRST]{1}[\d+]{2}([A-Z]{1}[\d+]{3})

问题 I am making a card app and I need to make an animation so that a card would change its constraints to move to another place. How would I do this for a UIImage. 回答1: First of all you have to drag and drop your constraint into your view controller, to make an outlet. The same way you are doing it with UIImageView or UITableView , etc. Actually, for those who have watched WWDC (2014 I guess), Apple have explained how to animate UI in the proper way. Firstly, you have to call layoutIfNeeded()

问题 I am trying to add a constraint based on a condition. Example: CREATE TABLE dbo.TestTable( [DbKey] [uniqueidentifier] NOT NULL, [GroupKey] [uniqueidentifier] NOT NULL, [EnableGroup] bit NOT NULL CONSTRAINT [TestTable_PK] PRIMARY KEY CLUSTERED ( [DbKey] ASC ) )ON [PRIMARY] So, there could be multiple records that would have the same GroupKey, but I want that at most one record, could have the EnableGroup set to true for a given GroupKey. Any help is appreciated. 回答1: You could use a check

问题 This question already has an answer here : How to change the primary key to be non-clustered? (1 answer) Closed last year . I am new to SQL and I have a SQL file and when I execute it the following error occurs: Msg 1913, Level 16, State 1, Line 463 The operation failed because an index or statistics with name 'DDT_PK' already exists on table 'DAILY_DATA_TYPE'. The error occurs when running this statement: CREATE UNIQUE NONCLUSTERED INDEX DDT_PK ON [DATE_DATA_TYPE]([TYPE_ID]) GO ALTER TABLE

问题 Using Swift-5.0, Xcode-10.2, iOS-12.2, There is an issue in my code while trying to achieve "autosizing" of cells in a UICollectionView (using UICollectionViewFlowLayout as its layout). The height of the cell is content-based (and unknown upfront) - therefore I try to get the cell's height to autosize (the "width" I don't care for now and can, for example, be set to frame.width ). Even tough, I only use one large UICollectionView-Cell for the example below, I would still like to keep

问题 I am declaring a constraint inside a UIViewController class called Home . Here's what the code looks like: class Home: UIViewController { @IBOutlet weak var buttonUpgrade: UIButton! var constraint = NSLayoutConstraint (item: buttonUpgrade, attribute: NSLayoutAttribute.Bottom, relatedBy: NSLayoutRelation.Equal, toItem: self.view, attribute: NSLayoutAttribute.Bottom, multiplier: 1, constant: 500) ... } However, I get this error: Home.type does not have a member named buttonUpgrade . Why? You

问题 I got 2 tables, Persons and Relationships . The Persons table got only 2 fields for now: ID and Age . Relationships have 3 fields: Person_ID , Relative_ID and Relation What I wanna do is simple: on insertion\update to Relationships I want to check the following: if Relation == 'child' and Persons[Person_ID].Age < Persons[Relative_ID].Age: Throw Exception Thanks 回答1: You should create trigger. Try this CREATE OR REPLACE TRIGGER my_trg BEFORE INSERT OR UPDATE ON Relationships FOR EACH ROW

问题 Hi I'm having trouble getting my sql syntax correct. I want to create a unique constraint that looks at the newly added foreign key, looks at some properties of the newly related entity to decided if the relationship is allowed. CREATE or replace TRIGGER "New_Trigger" AFTER INSERT OR UPDATE ON "Table_1" FOR EACH ROW BEGIN Select "Table_2"."number" (CASE "Table_2"."number" > 0 THEN RAISE_APPLICATION_ERROR(-20000, 'this is not allowed'); END) from "Table_1" WHERE "Table_2"."ID" = :new.FK_Table

问题 I have a UIView in a portrait-only app. The view is centered vertically and horizontally with AutoLayout ("manually" using storyboards). The width equals the (main)view.width * 0.9 The height is the same size of the width (it is a square). I want to tap a button inside this UIView and animate it only vertically until it reaches the top border of the screen (eg. height*0.9, 10 pts, whatever is possible). When I click again, I want to reposition back the view to its original position (centered

问题 In F#, you can perform black-magic voodoo 1 and perform static typed constraints to ensure a function is only called on types that have the member constraints. For example: module Collection let inline init s = let collection = new ^t() let add e = (^t : (member Add : 'a -> unit) collection, e) Seq.iter add s collection This function can be called where a type that has an Add<'a> that has the signature 'a -> unit . Usage: let a:List<_> = Collection.init {1..10} let b:SynchronizedCollection<_>