In Oracle there is a mechanism to generate sequence numbers e.g.;
CREATE SEQUENCE supplier_seq MINVALUE 1 MAXVALUE 999999999999999999999999999 START WITH 1 INCREMENT BY 1 CACHE 20;
And then execute the statement
supplier_seq.nextval
to retrieve the next sequence number.
How would you create the same functionality in MS SQL Server ?
Edit: I’m not looking for ways to automaticly generate keys for table records. I need to generate a unique value that I can use as an (logical) ID for a process. So I need the exact functionality that Oracle provides.
There is no exact match.
The equivalent is IDENTITY that you can set as a datatype while creating a table. SQLSERVER will automatically create a running sequence number during insert. The last inserted value can be obtained by calling SCOPE_IDENTITY() or by consulting the system variable @@IDENTITY (as pointed out by Frans)
If you need the exact equivalent, you would need to create a table and then write a procedure to retun the next value and other operations. See Marks response on pitfalls on this.
Edit:
SQL Server has implemented the Sequence similar to the Oracle. Please refer to this question for more details.
How would you implement sequences in Microsoft SQL Server?