问题描述
我有一个SQL Server 2008数据库。该数据库具有一个称为 Book的表。 图书具有以下属性:
I have a SQL Server 2008 database. This database has a Table called "Book". "Book" has the following properties:
- ID(int)
- 标题(nvarchar(256 ))
- 发布日期(日期时间)
我需要创建一个计算列 AgeInMinutes 。我对计算列不是很熟悉。我理解这个概念,但不确定如何去做。在SQL Server Management Studio的列属性区域中,我在表设计器部分中看到一个名为(公式)的属性。我想我需要在这里输入我的计算。但是,我不确定该放在哪里。有人可以帮我吗?
I need to create a computed column called "AgeInMinutes". I'm not very familiar with computed columns. I understand the concept, but I'm not sure how to do it. In SQL Server Management studio, in the "Column Properties" area, I see a property called "(Formula)" in the Table Designer section. I assume I need to enter my calculation here. However, I'm not sure what to put here. Can somebody please help me?
谢谢!
推荐答案
您可以将创建表
中的列定义为:
You can define the column in your CREATE TABLE
as:
AgeInMinutes为(DATEDIFF(minute ,PublishDate,GETDATE())
或者,只需
ALTER TABLE Book
ADD AgeInMinutes as (DATEDIFF(minute, PublishDate, GETDATE())
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