- PostgreSQL - SERIAL - Generate IDs (Identity, Auto-increment) - SQLines Open Source Tools
- Using Variables To Update and Increment the Value by 1
- How to RESET identity columns in SQL Server
- Creating a Sequence
PostgreSQL - SERIAL - Generate IDs (Identity, Auto-increment) - SQLines Open Source Tools
In and up, you could use OUTPUT with your inserts to put the identity numbers and all the other inserted values, if desired into a table variable. In the event of a rollback, the values in the table variable survive unchanged, and you could insert those into your audit table with a "Rolled Back" flag. That way the sequence is preserved, and there are no gaps.
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You must be logged in to reply to this topic. Login to reply. April 28, at am Thanks Christopher That does the trick.
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Hi Jack, Yeah concurrency is a problem with the solution provided. The DBCC reseed to 0 then a reseed will always give you the next avaible seed value. However I am with you in terms of why you the OP has to have consecutive id's. If the OP needs this for later creating Reference numbers or some such data, then I woudl suggest creating another table that holds you Id and then holds a consecutive running number Try to learn something about everything and everything about something.
Jack, Christopher Concurrency is an issue.
Using Variables To Update and Increment the Value by 1
Consider what is supposed to happen if you have concurrent transactions going on. Transaction A inserts, which produces identity value Transaction B inserts, which produces identity value If they're not, reset the identity value to avoid errors or gaps in the sequence of values. Reseeding an identity column is a common task, but you must know the basics or you might get into trouble.
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Specifically, an identity column can generate duplicate values. Knowing when and why is the key to keeping an identity column in check.
Susan Sales Harkins is an independent consultant and the author of several articles and books on database technologies. You can reach her at ssharkins gmail.
How to RESET identity columns in SQL Server
Susan Sales Harkins is an IT consultant, specializing in desktop solutions. Previously, she was editor in chief for The Cobb Group, the world's largest publisher of technical journals. Editor's Picks. Transgender employees in tech: Why this "progressive" industry has more work to do.
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Creating a Sequence
Show Comments. Hide Comments. Please write comments if you find anything incorrect, or you want to share more information about the topic discussed above. Writing code in comment? Please use ide. A sequence is a user defined schema bound object that generates a sequence of numeric values. Sequences are frequently used in many databases because many applications require each row in a table to contain a unique value and sequences provides an easy way to generate them.