SQL Server: "Mostly-unique" index

Posted by Ian Boyd on Stack Overflow See other posts from Stack Overflow or by Ian Boyd
Published on 2010-05-12T17:04:34Z Indexed on 2010/05/12 17:14 UTC
Read the original article Hit count: 257

Filed under:

sql-server

|

sql-server-2000

|

sql-server-2005

|

unique-constraint

|

multicolumn

In a table i want to ensure that only unique vales exist over the five-column key:

Timestamp Account RatingDate TripHistoryKey EventAction
========= ======= ========== ============== ===========
2010511   1234    2010511    1              INSERT
2010511   1234    2010511    4              INSERT
2010511   1234    2010511    7              INSERT
2010511   1234    2010511    1              INSERT   <---duplicate

But i only want the unique constraint to apply between rows when EventAction is INSERT:

Timestamp Account RatingDate TripHistoryKey EventAction
========= ======= ========== ============== ===========
2010511   1234    2010511    1              INSERT
2010511   1234    2010511    1              UPDATE
2010511   1234    2010511    1              UPDATE   <---not duplicate
2010511   1234    2010511    1              UPDATE   <---not duplicate
2010511   1234    2010511    1              DELETE   <---not duplicate
2010511   1234    2010511    1              DELETE   <---not duplicate
2010511   1234    2010511    1              INSERT   <---DUPLICATE

Possible?

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