@@identity in postgresql?

I'm suppose to migrate data at work from MS SQL server to Postgresql. Everything is done except, how can I obtain @.@.identity in postgresql?
Thanks in advance.You can use nextval() or currval().|||Check out the following link:

link (http://www.postgresql.org/idocs/)

@@DBTS correct usage

Hi,

Suppose my Test table has a timestamp (rowversion) column, and I have the following code:

INSERT INTO Test ...

SELECT @.@.DBTS as 'TS'

Can I be sure the TS return column value contains the value of the timestamp column of the Test table? I suspect no in general (although it will work "most of the time"), but I would like a confirmation.

If I am correct, and there may be a mismatch, is there any clever way of getting the exact value, except from doing a SELECT WHERE ...?

Thanks.

Can I be sure the TS return column value contains the value of the timestamp column of the Test table?

If the BOL said "@.@.DBTS Returns the value of the current timestamp data type for the current database", then you couldn't.

Anyway, there are some other ways to find the records have been inserted.

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INSERT INTO Test ...

SELECT @.@.DBTS as 'TS'

You are correct, this will not work in a lot of cases since the timestamp (better to start using the rowversion synonym too) value is shared amongst all tables. It would require a database lock to prevent this from possibly failing

Doing a SELECT is the best way, and will almost always be really fast since:

1. You will likely have the primary key value
2. The row will be in cache since you just created it.