Solved

Are you supposed to apply the primary key to an IDENTITY column? Please elaborate.

Posted on 2013-02-07
2
222 Views
Last Modified: 2013-02-07
When creating  an IDENTITY column in  a table do you also apply a primary key to it?


Example:
CREATE TABLE HR.Employees(
EmployeeId INT IDENTITY(1000 ,2) NOT NULL
,etc…)
0
Comment
Question by:rhservan
  • 2
2 Comments
 
LVL 65

Accepted Solution

by:
Jim Horn earned 500 total points
ID: 38865555
Identity fields are almost always primary keys yes, as it guarantees uniqueness in a row, but it is not required.

In your above T-SQL, making EmployeID the identity field might not always work, if the client sees a scenario where they would want to manually change the id for whatever reason.   If that's the case, an identity field would be the primary key, the actual EmployeeID would be what's called a 'business key'.  Forms would always display business key, and the database is related via the identity field.

You'll have to feel them out on that one.
0
 
LVL 65

Expert Comment

by:Jim Horn
ID: 38865687
Thanks for the grade.  Good luck with your project.  -Jim
0

Featured Post

NAS Cloud Backup Strategies

This article explains backup scenarios when using network storage. We review the so-called “3-2-1 strategy” and summarize the methods you can use to send NAS data to the cloud

Question has a verified solution.

If you are experiencing a similar issue, please ask a related question

Suggested Solutions

Title # Comments Views Activity
Managing Columnstore Indexes 2 33
tempdb log contention 16 41
sql Total query 2 29
SQL Server 2012 r2 - Varible Table 3 27
Audit has been really one of the more interesting, most useful, yet difficult to maintain topics in the history of SQL Server. In earlier versions of SQL people had very few options for auditing in SQL Server. It typically meant using SQL Trace …
After restoring a Microsoft SQL Server database (.bak) from backup or attaching .mdf file, you may run into "Error '15023' User or role already exists in the current database" when you use the "User Mapping" SQL Management Studio functionality to al…
This video shows how to use Hyena, from SystemTools Software, to bulk import 100 user accounts from an external text file. View in 1080p for best video quality.
Email security requires an ever evolving service that stays up to date with counter-evolving threats. The Email Laundry perform Research and Development to ensure their email security service evolves faster than cyber criminals. We apply our Threat…

825 members asked questions and received personalized solutions in the past 7 days.

Join the community of 500,000 technology professionals and ask your questions.

Join & Ask a Question