Just use an ALTER TABLE… MODIFY… query and add NOT NULL into your existing column definition. For example: ALTER TABLE Person MODIFY P_Id INT(11) NOT NULL; A word of caution: you need to specify the full column definition again when using a MODIFY query. If your column has, for example, a DEFAULT value, or a … Read more
This should work: ALTER TABLE t_tableName ADD newColumn VARCHAR(50) CONSTRAINT YourContraintName DEFAULT ” NOT NULL
SQL Server does simple counting of cascade paths and, rather than trying to work out whether any cycles actually exist, it assumes the worst and refuses to create the referential actions (CASCADE): you can and should still create the constraints without the referential actions. If you can’t alter your design (or doing so would compromise … Read more
I’m pretty sure you can’t simply add on delete cascade to an existing foreign key constraint. You have to drop the constraint first, then add the correct version. In standard SQL, I believe the easiest way to do this is to start a transaction, drop the foreign key, add a foreign key with on delete … Read more
As explained here, seems the foreign key constraint has to be dropped by constraint name and not the index name. The syntax is: ALTER TABLE footable DROP FOREIGN KEY fooconstraint;
If you never want to have duplicates, you should declare this as a table constraint: CREATE TABLE bookmarks( users_id INTEGER, lessoninfo_id INTEGER, UNIQUE(users_id, lessoninfo_id) ); (A primary key over both columns would have the same effect.) It is then possible to tell the database that you want to silently ignore records that would violate such … Read more
— Disable the constraints on a table called tableName: ALTER TABLE tableName NOCHECK CONSTRAINT ALL — Re-enable the constraints on a table called tableName: ALTER TABLE tableName WITH CHECK CHECK CONSTRAINT ALL ——————————————————— — Disable constraints for all tables in the database: EXEC sp_msforeachtable ‘ALTER TABLE ? NOCHECK CONSTRAINT ALL’ — Re-enable constraints for all … Read more
drop constraint and recreate it alter table Persion drop CONSTRAINT <constraint_name> alter table Persion add primary key (persionId,Pname,PMID) edit: you can find the constraint name by using the query below: select OBJECT_NAME(OBJECT_ID) AS NameofConstraint FROM sys.objects where OBJECT_NAME(parent_object_id)=’Persion’ and type_desc LIKE ‘%CONSTRAINT’
This post helped me A LOT! I added UIViewAlertForUnsatisfiableConstraints symbolic breakpoint with suggested action: Obj-C project po [[UIWindow keyWindow] _autolayoutTrace] Swift project expr -l objc++ -O — [[UIWindow keyWindow] _autolayoutTrace] With this hint, the log became more detailed, and It was easier for me identify which view had the constraint broken. UIWindow:0x7f88a8e4a4a0 | UILayoutContainerView:0x7f88a8f23b70 | … Read more
You need to first change the constraint and then animate the update. This should be in the superview. self.nameInputConstraint.constant = 8 Swift 2 UIView.animateWithDuration(0.5) { self.view.layoutIfNeeded() } Swift 3, 4, 5 UIView.animate(withDuration: 0.5) { self.view.layoutIfNeeded() }