Yes, a foreign key is a type of constraint. MySQL has uneven support for constraints: PRIMARY KEY: yes as table constraint and column constraint. FOREIGN KEY: yes as table constraint, but only with InnoDB and BDB storage engines; otherwise parsed but ignored. CHECK: parsed but ignored in all storage engines. UNIQUE: yes as table constraint … Read more
I usually remove this warning by lowering the priority of the constraint that AutoLayout is trying to break. So if it says: Will attempt to recover by breaking constraint <NSLayoutConstraint:0x7fd7c2ecb520 V:[UIView:0x7fd7c2ecd0e0(300)]> Go ahead and lower that one’s priority to 999. That should work. Cheers.
To fix a view to the bottom of the screen you need following constraints to set. Leading Constraint with respect of Parent View for – X Trailing Constraint with respect of Parent View for – Width Bottom Constraint with respect of Parent View for – Y Height Constraint attached to self for – Height. Lets … Read more
Ed is correct, the columns are exposed on the constraint column usage view, here is the SQL for it. select TC.Constraint_Name, CC.Column_Name from information_schema.table_constraints TC inner join information_schema.constraint_column_usage CC on TC.Constraint_Name = CC.Constraint_Name where TC.constraint_type=”Unique” order by TC.Constraint_Name
In SQL Server, you can use the constraint keyword to define foreign keys inline and name them at the same time. Here’s the updated script: CREATE TABLE galleries_gallery ( id INT NOT NULL PRIMARY KEY IDENTITY, title NVARCHAR(50) UNIQUE NOT NULL, description VARCHAR(256), templateID INT NOT NULL CONSTRAINT FK_galerry_template REFERENCES galleries_templates(id), jsAltImgID INT NOT NULL … Read more
I’m also not sure why the restriction is there. You could try sending a friendly e-mail to the designers of Java 5 Generics (chiefly Gilad Bracha and Neal Gafter). My guess is that they wanted to support only an absolute minimum of intersection types (which is what multiple bounds essentially are), to make the language … Read more
Maybe you could restrict to IConvertible types? All the system primitives that can be converted using these interface methods also implement the interface, so this restriction would require T to be one of the following: Boolean Byte Char DateTime Decimal Double Int (16, 32 and 64-bit) SByte Single (float) String UInt (16, 32 and 64-bit) … Read more
SQL Server syntax for the check constraint: create table numbers ( number int not null check(number >= 1234 and number <= 4523), … ) create table numbers ( number int not null, check(number >= 1234 and number <= 4523), … ) create table numbers ( number int not null, constraint number_range_check check(number >= 1234 and … Read more
First the implemented interfaces, then the generic type constraints separated by where: class SampleC<T> : IDisposable where T : IDisposable // case C { // ↑ public void Dispose() { throw new NotImplementedException(); } }
To disable foreign key constraints: DECLARE @sql nvarchar(max) = N”; ;WITH x AS ( SELECT DISTINCT obj = QUOTENAME(OBJECT_SCHEMA_NAME(parent_object_id)) + ‘.’ + QUOTENAME(OBJECT_NAME(parent_object_id)) FROM sys.foreign_keys ) SELECT @sql += N’ALTER TABLE ‘ + obj + N’ NOCHECK CONSTRAINT ALL; ‘ FROM x; EXEC sys.sp_executesql @sql; To re-enable: DECLARE @sql nvarchar(max) = N”; ;WITH x AS … Read more