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How to write hierarchical query in sql

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This is a two-part article. In part one you were introduced to the hierarchyid type. In this article we dig deeper into the hierarchyid functions. To start with this query, lets get the employee and their name. In SQL server hierarchical query speak, this is the ancestor.
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Recursive Queries using Common Table Expressions (CTE) in SQL Server

How to write hierarchical query in sql
How to write hierarchical query in sql
How to write hierarchical query in sql
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sql server - Write a hierarchical query in sql? - Stack Overflow

If a table contains hierarchical data, then you can select rows in a hierarchical order using the hierarchical query clause:. In a hierarchical query, one expression in condition must be qualified with the PRIOR operator to refer to the parent row. For example,. For example:. It evaluates the immediately following expression for the parent row of the current row in a hierarchical query. PRIOR is most commonly used when comparing column values with the equality operator. However, the conditions created by these other operators can result in an infinite loop through the possible combinations.
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Hierarchical Data and How to Query It in SQL

You can use hierarchical queries to travel along parent-child relationships in your data. For example, family trees, computer directory structures, and company organization charts. Connect by is an Oracle-specific way to create data trees using SQL. It has two key clauses, start with and connect by. You state which rows are the roots here.
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I have seen this design quite a lot in the past and in the relational database world this is the obvious choice. Each data entry is really simple to load or manipulate. Just load the target element and change the ParentId for a move action etc.. You could load everything, but if your dataset is large enough, this operation will work poorly and might kill your database.
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