Top "Constraints" questions

A constraint is a condition that has to be fulfilled in a given context.

Removing the CENTER element from a JPanel using BorderLayout

Is there any way of removing the Component added to the CENTER of a JPanel with a BorderLayout, without having …

java swing layout constraints components
How to create composite key?

I am new to MySQL WB so I can create foreign key by adding relation between to dependen tables. But …

mysql sql constraints composite mysql-workbench
where to create autolayout constraints for subclassed uitableviewcell?

I am trying to use autolayout for a uitableviewcell subclass I am creating and I would appreciate some advice on …

ios uitableview constraints autolayout layoutsubviews
Deferrable Constraints in SQL Server

Do any versions of SQL Server support deferrable constraints (DC)? Since about version 8.0, Oracle has supported deferrable constraints - constraints …

sql sql-server database oracle constraints
How to find constraints columns in DB2

I want to know the columns (names) which belong to each unique constraint. I can easily find the constraints and …

db2 constraints db2-luw
Why can I create a table with PRIMARY KEY on a nullable column?

The following code creates a table without raising any errors: CREATE TABLE test( ID INTEGER NULL, CONSTRAINT PK_test PRIMARY …

postgresql constraints primary-key ddl postgresql-9.3
How to catch constraint violation in PL/SQL?

CREATE TABLE LOCATION ( LOCID VARCHAR2(5) , MINQTY NUMBER , MAXQTY NUMBER , PRIMARY KEY (LOCID) , CONSTRAINT CHECK_LOCID_LENGTH CHECK (LENGTH(LOCID) = 5) , CONSTRAINT …

sql oracle plsql constraints check-constraint
Springs in Auto Layout: Distribute views evenly, with constraints, in Xcode 5

I understand the old Struts and Springs method of aligning, sizing and distributing views in Interface Builder. However, I cannot …

ios7 interface-builder constraints xcode5 autolayout
'NSInvalidArgumentException', reason: 'Unable to parse constraint format'

I have a subview that I want to keep stops during rotating screen, so I decided to put the NSLayoutConstraint …

ios layout compiler-errors constraints autolayout
CONSTRAINT to check values from a remotely related table (via join etc.)

I would like to add a constraint that will check values from related table. I have 3 tables: CREATE TABLE somethink_…

postgresql database-design foreign-keys constraints referential-integrity