I\'m working on a project involving C# and开发者_StackOverflow中文版 a SQL Server 2008 database.
I\'ve an entity LearningUnit that has an int primary key. Actually, it has nothing more. Entity Concept has the following relationship with it:
I have to make a process in Oracle/PLSQL. I have to verify that the interval of time between start_date and end_date from a new row that I create must not intersect other start_dates and end_dates fro
I have a SQL Server database with an Apartment table (which has columns FloorNum and BuildingID) and an ApartmentBuilding table (with column NumFloors). Is there any w开发者_如何学编程ay to set up a c
I\'m trying to impose a @Oneto7 association. I\'d have imagined an attribute that specifies the target many value, but have found none.
I\'m using SQL Server 20开发者_开发技巧08 and I have a table with three columns: Length, StartTime and EndTime. I want to make a CHECK constraint on this table which says that:
Please imagine this small database... Diagram removed dead ImageSha开发者_Go百科ck link - volunteer database diagram
I wish to make sure that my data has a constraint the following check (constraint?) in place This table can only have one BorderColour per hub/category. (eg. #FFAABB)
Any suggestions on whether fewer check constraints are better, or more?How should they be grouped if at all?
While subclassing db.models.Model, s开发者_Python百科ometimes it\'s essential to add extra checks/constraints.
加载中,请稍侯......