Consider adding a flag to the User table that indicates if the user is a temporary user or not: alter table user add is_temp tinyint unsigned default 0 not null; This will allow a simple foreign key reference from In_Out: alter table In_Out change id User_id <Match Data Type And Nullness Here>, add constraint User_id_fk … Read more
When using session, a random string is generated to identify a user – this string is called session ID. Session ID is stored in cookies. Cookies are sent to the web server with every request. On the server, session ID is then connected with session data. Attacker can’t change the session data, therefore, storing a … Read more
class User belongs_to :lives, class_name: ‘Loca’, foreign_key: ‘lives_location’ belongs_to :works, class_name: ‘Loca’, foreign_key: ‘works_location’ … end class Loca has_many :users … end 1 solved Ruby on Rails having more than 1 different column foreign keyed to same table
With 2 courses you are always going to get 2 rows when joining like this. It will give you the minimum date value for each course. The first way you can get a single row is to use TOP 1 in your query, which will simply give you the course with the earliest test date. … Read more
I’m not sure I understand why you think this is better than foreign keys, but yes, you can implement referential integrity in other (inferior) ways. These will be slower than doing it right and fixing the design. Check constraint + UDF CREATE FUNCTION dbo.IsItAValidWeight(@Son_Weight int) RETURNS bit WITH SCHEMABINDING AS BEGIN RETURN ( SELECT CASE … Read more