Top "Calculated-columns" questions

A calculated column is calculated from an expression that can use other columns in the same table

How can I cache a calculated column in rails?

I have a tree of active record objects, something like: class Part < ActiveRecord::Base has_many :sub_parts, :class_…

ruby-on-rails ruby calculated-columns caching
How to put foreign key constraints on a computed fields in sql server?

Table A has a computed field called Computed1. It's persisted and not null. Also, it always computes to an expression …

sql-server tsql sql-server-2008 foreign-keys calculated-columns
How to use DateDiff in calculated field in access

I am trying to get "No of days late" in a particular table in MS access. I am trying to …

ms-access calculated-columns calculated-field
How to use a MySQL column alias for calculations?

How can I use my column alias (lat and lng) from the two subqueries to make the distance calcuation underneath? …

mysql subquery alias calculated-columns
Syncing column width of between tables in two different frames, etc

For reasons which are somewhat unavoidable (lots of legacy code, compatibility, design needs) I have the following problem: I have …

javascript css dom calculated-columns