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title: "sys.fn_cdc_decrement_lsn (Transact-SQL) | Microsoft Docs"
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# sys.fn_cdc_decrement_lsn (Transact-SQL)
[!INCLUDE[tsql-appliesto-ss2008-xxxx-xxxx-xxx_md](../../includes/tsql-appliesto-ss2008-xxxx-xxxx-xxx-md.md)]

  Returns the previous log sequence number (LSN) in the sequence based upon the specified LSN.  
  
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 ![Topic link icon](../../database-engine/configure-windows/media/topic-link.gif "Topic link icon") [Transact-SQL Syntax Conventions](../../t-sql/language-elements/transact-sql-syntax-conventions-transact-sql.md)  
  
## Syntax  
  
```  
  
sys.fn_cdc_decrement_lsn ( lsn_value )  
```  
  
## Arguments  
 *lsn_value*  
 LSN value. *lsn_value* is **binary(10)**.  
  
## Return Type  
 **binary(10)**  
  
## Remarks  
 The LSN returned by the function is always less than the specified value, and no LSN values can exist between the two values.  
  
## Permissions  
 Requires membership in the **public** database role.  
  
## Examples  
 The following example uses `sys.fn_cdc_decrement_lsn` to set the upper LSN boundary in a query that returns change data rows that have LSN values less than the maximum LSN value.  
  
```  
Use AdventureWorks2012;  
GO  
DECLARE @from_lsn binary(10), @to_lsn binary(10);  
SET @from_lsn = sys.fn_cdc_get_min_lsn('HumanResources_Employee');  
SET @to_lsn = sys.fn_cdc_decrement_lsn(sys.fn_cdc_get_max_lsn());  
SELECT * FROM cdc.fn_cdc_get_all_changes_HumanResources_Employee( @from_lsn, @to_lsn, 'all');   
GO  
```  
  
## See Also  
 [sys.fn_cdc_increment_lsn (Transact-SQL)](../../relational-databases/system-functions/sys-fn-cdc-increment-lsn-transact-sql.md)   
 [sys.fn_cdc_get_min_lsn (Transact-SQL)](../../relational-databases/system-functions/sys-fn-cdc-get-min-lsn-transact-sql.md)   
 [sys.fn_cdc_get_max_lsn (Transact-SQL)](../../relational-databases/system-functions/sys-fn-cdc-get-max-lsn-transact-sql.md)   
 [The Transaction Log (SQL Server)](../../relational-databases/logs/the-transaction-log-sql-server.md)   
 [About Change Data Capture (SQL Server)](../../relational-databases/track-changes/about-change-data-capture-sql-server.md)