Use hierarchyid as a data type to create tables with a hierarchical structure, or to describe the hierarchical structure of data that is stored in another location. Use the hierarchyid functions in Transact-SQL to query and manage hierarchical data. A value of the hierarchyid data type represents a position in a tree hierarchy.

Apr 20, 2021 · Learn what hierarchical data is, how it’s stored in a database, and how to query it using self-joins and recursive CTEs.

Aug 7, 2013 · Using this query, I can get the hierarchy (just pretend 'A' is a uniqueidentifier, I know it isn't in real life): SELECT * FROM EstimateItem. WHERE EstimateID = @EstimateID. UNION ALL. SELECT ei.* FROM EstimateItem ei. INNER JOIN temp x ON ei.ParentEstimateItemID = x.EstimateItemID.

Apr 24, 2012 · In the following examples, you will learn how to harness the power of a recursive CTE query by fulfilling a common business requirement, retrieving hierarchical data. By the time the final query is complete you will be able to easily determine how many levels from the top executive each employee is.

Dec 5, 2017 · How to get the root in a hierarchy query using SQL Server from any level of Hierarchy

Feb 4, 2025 · In this lesson, you start with a new table, and insert data by using the hierarchical methods. Then, you query and manipulate the data by using the hierarchical methods. To complete this tutorial, you need SQL Server Management Studio, access to a server that's running SQL Server, and an AdventureWorks2022 database.

Mar 19, 2024 · Hierarchical data is structured like a family tree, where each member (node) is linked to others (children) in a parent-child relationship, forming a hierarchy. It's ideal for representing corporate reporting structures or organizing tasks within projects.

Dec 15, 2011 · I am trying to get the hierarchy level of this query. Here is the CTE recursive query. SELECT Id, Parentid, Name. FROM dbo.Category. UNION ALL. SELECT cr.Id, c.Parentid, cr.Name. FROM CategoryRec AS cr INNER JOIN dbo.Category AS c ON cr.Parentid = c.Id. WHERE c.Parentid IS NOT NULL.

Aug 24, 2023 · Azure SQL and SQL Server have a special data type called hierarchyid that is used to store hierarchical data. In this case, "hierarchical data" essentially means data that forms a tree structure, where each item can have a parent and/or children. Examples of such data are:

Feb 22, 2021 · Learn how to create a SQL Server hierarchical query with CTEs, with this chapter from Steve Stedmans Common Table Expressions book.