The database Sequence Object introduced in SQL Server 2012 and we can use and assign single Sequence object to multiple tables.

In this post, I am sharing a script to find all dependencies of the SQL Server Sequence object so that we can drop a Sequence object quickly.

Below is a small demonstration, in which I created a Sequence object and assigned to two different tables.

Create a Sequence object:

CREATE SEQUENCE dbo.Seq_Sample AS
INT START WITH 1
INCREMENT BY 1 ;
GO

Create two different tables:

CREATE TABLE dbo.tbl_FirstSample
( 
	Rno INT
	,Name VARCHAR(255)
)
GO

CREATE TABLE dbo.tbl_SecSample
( 
	EmpID INT
	,EmpName VARCHAR(255)
)
GO

Assign Sequence object to both the tables:

ALTER TABLE dbo.tbl_FirstSample
ADD CONSTRAINT seq_tbl_FirstSample_Rno
DEFAULT (NEXT VALUE FOR dbo.Seq_Sample) FOR Rno;
GO

ALTER TABLE dbo.tbl_SecSample
ADD CONSTRAINT seq_tbl_SecSample_EmpID
DEFAULT (NEXT VALUE FOR dbo.Seq_Sample) FOR EmpID;
GO

Now, try to drop the Sequence object:

DROP SEQUENCE dbo.Seq_Sample
GO

You will get a below error:

Script to find and generate Alter command for all the dependencies:

SELECT
	'ALTER TABLE '
	+ object_name(parent_object_id)
	+ ' DROP CONSTRAINT '
	+ referencing_entity_name AS AlterCommands
FROM sys.dm_sql_referencing_entities ('dbo.Seq_Sample', 'OBJECT') AS DR
INNER JOIN sys.default_constraints AS DC
    ON DR.referencing_id=DC.object_id
GO

The result:

Before dropping a Sequence object, we should drop all Sequence object constraint so copy the above result and drop both constraints before dropping a Sequence object.