How can I determine if a Sequence exist in SQL Server 2012?

Question

I need to create a SQL script to determine if a sequence exists in a SQL Server 2012 database. I am familiar with process for determine if a stored procedure exist but not sequence. Thank you.

Answer 1

The script to determine whether or not a Sequence exists in SQL Server 2012 is very similar to checking for Stored Procedures. Consider the following code that checks to see if a Stored Procedure exists:

SELECT *
FROM sys.objects
WHERE object_id = OBJECT_ID(N'[dbo].[SProc_Name]') AND type IN (N'P', N'PC')

The values of 'P' and 'PC' for the type specify the type of the sys.object is a SQL Stored Procedure or a Assembly (CLR) stored-procedure. To check for a sequence, you just need to change it to 'SO' which indicates it is a Sequence Object:

SELECT *
FROM sys.objects
WHERE object_id = OBJECT_ID(N'[dbo].[Sequence_Name]') AND type = 'SO'

For example, if you want to create a Sequence if it doesn't exist, you could use the following code:

IF NOT EXISTS(SELECT * FROM sys.objects WHERE object_id = OBJECT_ID(N'[dbo].[Sequence_Name]') AND type = 'SO')
CREATE SEQUENCE [dbo].[Sequence_Name] 
    AS [bigint]
    START WITH 1
    INCREMENT BY 1
    MINVALUE 1
    MAXVALUE 9223372036854775807
    CACHE  3 
GO

I hope this helps!

Answer 2

By checking data in sys.sequences table:

select *
from sys.sequences
where object_id = object_id('schema_name.sequence_name')

actually that if you're sure that there's no object other than sequence with name equals 'schema_name.sequence_name', you could just check object_id('schema_name.sequence_name') is not null

sql fiddle demo

Answer 3

This is another shortcut version of Tim S:

IF OBJECT_ID('schema_name.sequence_name', 'SO') IS NOT NULL 
BEGIN
    DROP SEQUENCE schema_name.sequence_name
END

Answer 4

Try this. This will list all of the sequences for a given database.

SELECT
seq.name AS [Sequence Name],
seq.object_id AS [Object ID],
seq.create_date AS [Creation Date],
seq.modify_date AS [Last Modified Date],
SCHEMA_NAME(seq.schema_id) AS [Schema],
CAST(seq.precision AS int) AS [Numeric Precision],
CAST(seq.scale AS int) AS [Numeric Scale],
ISNULL(seq.start_value,N'''') AS [Start Value],
ISNULL(seq.increment,N'''') AS [Increment Value],
ISNULL(seq.minimum_value,N'''') AS [Min Value],
ISNULL(seq.maximum_value,N'''') AS [Max Value],
CAST(seq.is_cycling AS bit) AS [Is Cycle Enabled],
ISNULL(seq.cache_size,0) AS [Cache Size],
ISNULL(seq.current_value,N'''') AS [Current Value]
FROM sys.sequences AS seq

Answer 5

I'm using SQL Server 17.4 (Latest version of MS SQL Sever) and this SQL script worked with me. This SQL script, for example, creates the sequence if not exists.

IF NOT EXISTS
(
SELECT [name]
FROM sys.sequences
WHERE [name] = 'seq_businessTripRequest'
)
BEGIN

CREATE SEQUENCE [dbo].[seq_businessTripRequest]
AS [BIGINT]
START WITH 1
INCREMENT BY 1
MINVALUE-9223372036854775808
MAXVALUE 9223372036854775807
CACHE;

END;