What is the difference between sequence object and Identity in SQL Server?

What is the difference between sequence object and Identity in SQL Server?

What is the Difference Between Sequence Objects and Identity Columns in SQL Server? The Identity property is a column property meaning it is tied to the table, whereas the sequence is a user-defined database object and it is not tied to any specific table meaning its value can be shared by multiple tables.

What are the conditions to consider while using a sequence as a primary key of the table?

Primary keys must contain unique values. A primary key column cannot have NULL values. A table can have only one primary key, which may consist of single or multiple fields. When multiple fields are used as a primary key, they are called a composite key.

What is the difference between identity and primary key?

An identity is simply an auto-increasing column. A primary key is the unique column or columns that define the row. These two are often used together, but there’s no requirement that this be so.

How are identity ranges managed in Merge Replication?

Merge Replication Identity ranges are managed by the Publisher and propagated to Subscribers by the Merge Agent (in a republishing hierarchy, ranges are managed by the root Publisher and the republishers). The identity values are assigned from a pool at the Publisher.

What does not for replication do on identity column?

Replication sets the NOT FOR REPLICATION option on the identity column at the Subscriber, so that only user inserts cause the value to be incremented at the Subscriber. Note. Subscribers must synchronize with the Publisher to receive new ranges.

Where is the not for replication option in SQL Server?

Replication sets the NOT FOR REPLICATION option on the identity column at the Subscriber. None. This option is recommended only for backwards compatibility with earlier versions of SQL Server and is available only from the stored procedure interface for transactional publications.

Do you need a primary key for transactional replication?

There are a number of issues to consider regarding constraints on published tables: Transactional replication requires a primary key constraint on each published table. Merge replication does not require a primary key, but if one is present, it must be replicated. Snapshot replication does not require a primary key.