GetLevel (Database Engine)

Article
09/03/2024

Applies to: SQL Server Azure SQL Database Azure SQL Managed Instance

Returns an integer that represents the depth of the node this in the tree.

Syntax

-- Transact-SQL syntax  
node.GetLevel ( )

-- CLR syntax  
SqlInt16 GetLevel ( )

Return Types

SQL Server return type:smallint

CLR return type:SqlInt16

Remarks

Used to determine the level of one or more nodes or to filter the nodes to members of a specified level. The root of the hierarchy is level 0.

GetLevel is useful for breadth-first search indexes. For more information, see Hierarchical Data (SQL Server).

Examples

A. Returning the hierarchy level as a column

The following example returns a text representation of the hierarchyid, and then the hierarchy level as the EmpLevel column for all rows in the table:

SELECT OrgNode.ToString() AS Text_OrgNode,   
OrgNode.GetLevel() AS EmpLevel, *  
FROM HumanResources.EmployeeDemo;

B. Returning all members of a hierarchy level

The following example returns all rows in the table at the hierarchy level 2:

SELECT OrgNode.ToString() AS Text_OrgNode,   
OrgNode.GetLevel() AS EmpLevel, *  
FROM HumanResources.EmployeeDemo  
WHERE OrgNode.GetLevel() = 2;

C. Returning the root of the hierarchy

The following example returns the root of the hierarchy level:

SELECT OrgNode.ToString() AS Text_OrgNode,   
OrgNode.GetLevel() AS EmpLevel, *  
FROM HumanResources.EmployeeDemo  
WHERE OrgNode.GetLevel() = 0;

D. CLR example

The following code snippet calls the GetLevel() method:

this.GetLevel()

Share via