sql - How do I enforce a two-column constraint?

Posted by hamlin11 on Stack Overflow See other posts from Stack Overflow or by hamlin11
Published on 2010-05-14T16:44:19Z Indexed on 2010/05/14 16:54 UTC
Read the original article Hit count: 250

Filed under:

sql

|

sql-server-2005

|

sql-server-2008

I have a CustomerID column and an EffectiveDate column in a table.

I need the combination of these two to be unique.

However, I already have a primary key on an auto-numbered integer column.

What is a good way to accomplish my goal?

Thanks

© Stack Overflow or respective owner

Related posts about sql

SQL SERVER – Concat Strings in SQL Server using T-SQL – SQL in Sixty Seconds #035 – Video

as seen on SQL Authority - Search for 'SQL Authority'
Concatenating string is one of the most common tasks in SQL Server and every developer has to come across it. We have to concat the string when we have to see the display full name of the person by first name and last name. In this video we will see various methods to concatenate the strings. SQL… >>> More
SQL SERVER – Concat Function in SQL Server – SQL Concatenation

as seen on SQL Authority - Search for 'SQL Authority'
Earlier this week, I was delivering Advanced BI training on the subject of “SQL Server 2008 R2″. I had great time delivering the session. During the session, we talked about SQL Server 2010 Denali. Suddenly one of the attendees suggested his displeasure for the product. He said, even though… >>> More
Error with SQL Server Setup 2012 on Windows 2012

as seen on Server Fault - Search for 'Server Fault'
I am trying to install SQL Server on Windows 2012. I was able to finally get the wizard up and running after making some changes on the server, but now it fails no matter what I do with the following error: TITLE: SQL Server Setup failure. SQL Server Setup has encountered the following error: … >>> More
How can I detect which version of SQL (eg SQL 2008 or SQL Azure)

as seen on Stack Overflow - Search for 'Stack Overflow'
I need to detect which version of SQL I am dealing with to perorm various tasks, I need specifically detect if I am on SQL 2008 or SQL Azure. How can I do this with detection code written in SQL? >>> More
Nested SQL Select statement fails on SQL Server 2000, ok on SQL Server 2005

as seen on Stack Overflow - Search for 'Stack Overflow'
Here is the query: INSERT INTO @TempTable SELECT UserID, Name, Address1 = (SELECT TOP 1 [Address] FROM (SELECT TOP 1 [Address] FROM [UserAddress] ua INNER JOIN UserAddressOrder uo ON ua.UserID = uo.UserID WHERE ua.UserID = u.UserID ORDER BY uo.AddressOrder ASC) q ORDER BY AddressOrder… >>> More

Related posts about sql-server-2005

[MAJ] SQL Server 2005 Express Edition - La version gratuite de SQL Server 2005

as seen on ASP-PHP.net - Search for 'ASP-PHP.net'
Modification technique pour le site de l'article. >>> More
SQLAuthority News – Feature Pack for Microsoft SQL Server 2005 SP4

as seen on SQL Authority - Search for 'SQL Authority'
If you are still using SQL Server 2005 – I suggest that you consider migrating to later version of the SQL Server 2008/2008 R2. Due to any reason, you wanted to continue using SQL Server 2005, I suggest that you take a look at the Feature Pack for Microsoft SQL Server 2005 SP4. There are many… >>> More
SQL Server 2005 - Syncing development/production databases

as seen on Stack Overflow - Search for 'Stack Overflow'
I've got a rather large SQL Server 2005 database that is under constant development. Every so often, I either get a new developer or need to deploy wide-scale schema changes to the production server. My main concern is deploying schema + data updates to developer machines from the "master" development… >>> More
Displaying the Row Number in a SELECT Query with SQL Server 2005

as seen on Internet.com - Search for 'Internet.com'
SQL Server 2005 introduced a function that is very handy when you want the result set to have row numbers assigned to each returned row. >>> More
Displaying the Row Number in a SELECT Query with SQL Server 2005

as seen on Internet.com - Search for 'Internet.com'
SQL Server 2005 introduced a function that is very handy when you want the result set to have row numbers assigned to each returned row. >>> More