i have written a sql query to create autonumber in c# "select max(id)+1 from table;i

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i have written a sql query to create autonumber in c#
"select max(id)+1 from table;i
but when i delete 1 record i dont get that id number again with this command.

can any 1 tell me how to this in c#.

Posted 1-Nov-12 2:23am

Member 9563368

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ashriv 1-Nov-12 8:27am

why you want to get that deleted id? I think that Id is used as a Primary key so after deleting why you want that again? can you clarify your situation more ...

Sanjay K. Gupta 1-Nov-12 8:40am

Use Identity for next auto numbering.
For getting the deleted id you can try
select count(id)+1
But it may not be unique.

a1mimo 1-Nov-12 8:43am

Try google it's faster and easier than waiting for people to answer actually on google there is lots and lots of answers for your problem try search for fill gaps in sql server auto increment

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Pete O'Hanlon · Answer 1 · 2012-11-01T02:36:00

This would only work if you deleted the last record. If you delete an earlier record, that number is gone for good. In general though, it's not a good idea to try to create an id like this. Consider what happens in a multi user system where you have two records both trying to insert into the same table at the same time; both records could end up getting the same ID.

Santhosh Kumar Jayaraman · Answer 2 · 2012-11-01T03:26:00

Solution 2

Thats because its identity column and we did a delete , so whatever number you deleted , you cannot insert a record again for same number.. You need to do identity_insert on and insert record not using max(id)..

Posted 1-Nov-12 3:26am

Santhosh Kumar Jayaraman

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Pete O'Hanlon 1-Nov-12 11:25am

There's nowhere in the query that the OP states that it's an identity column. In fact, the logic he's using pretty much tells you that it is not an identity column.