Top "Check-constraints" questions

Create DB Constraint via Django

I have a Django model which looks like this: class Dummy(models.Model): ... system = models.CharField(max_length=16) I want …

django postgresql check-constraints

Oracle SQL - can CASE be used in a check constraint to determine data attributes?

I'm using Oracle 10g and I want to apply a constraint to a table where the value entered for one …

sql oracle constraints check-constraints

Check Constraint – only allow one column to be true if another column is true

Take the following example table: CREATE TABLE [dbo].[tbl_Example]( [PageID] [int] IDENTITY(1,1) NOT NULL, [RequireLogin] [bit] NOT NULL, [RequireAdmin] […

sql-server tsql sql-server-2008-r2 constraints check-constraints

Add constraint to existing SQLite table

I'm using SQLite, which doesn't support adding a constraint to an existing table. So I can't do something like this (…

sqlite database-schema entity-framework-core alter-table check-constraints

Can an SQL constraint be used to prevent a particular value being changed when a condition holds?

I know that SQL constraints can force data to meet validity criteria. However, what about criteria such as "Student's grade …

sql constraints check-constraints