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POSQL Server version of Oracle's CONNECT BY in LINQ to show hierachy
 

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    <p>I have successfully simulated an Oracle CONNECT BY statement in SQL Server 2008 by following these 2 previous answers <a href="https://stackoverflow.com/questions/959804/simulation-of-connect-by-prior-of-oracle-in-sql-server">here</a> and <a href="https://stackoverflow.com/questions/2200636/oracle-connect-by-clause-equivalent-in-sql-server">here</a> and adjusting to get the results I need. But how do I do this in LINQ?</p> <p>Here is an example of what I am doing using a dummy database:</p> <pre><code>CREATE TABLE Employee( EmployeeID INT IDENTITY(1,1) PRIMARY KEY, Department INT NOT NULL, EmployeeName VARCHAR(40) NOT NULL, PeckingOrder INT NOT NULL, HigherDepartment INT NULL) INSERT INTO Employee (Department,EmployeeName,PeckingOrder,HigherDepartment) VALUES (1,'Bart',1,NULL),(2,'Homer',1,1),(2,'Marge',2,NULL), (3,'Lisa',1,2),(3,'Maggie',2,2),(3,'Santas Helper',3,1) EmployeeID Department EmployeeName PeckingOrder HigherDepartment 1 1 Bart 1 NULL 2 2 Homer 1 1 3 2 Marge 2 NULL 4 3 Lisa 1 2 5 3 Maggie 2 2 6 3 Santas Helper 3 1 </code></pre> <p>and this is the SQL used to return the heirachy:</p> <pre><code>WITH n(level, PeckingOrder, Department, EmployeeName, HigherDepartment) AS (SELECT 1, PeckingOrder, Department, EmployeeName, HigherDepartment FROM Test.dbo.Employee WHERE Department = 3 UNION ALL SELECT n.level + 1, nplus1.PeckingOrder, nplus1.Department, nplus1.EmployeeName, nplus1.HigherDepartment FROM Test.dbo.Employee as nplus1 JOIN n ON n.HigherDepartment = nplus1.Department) SELECT MAX(level) AS level, PeckingOrder, Department, EmployeeName, HigherDepartment FROM n GROUP BY PeckingOrder, Department, EmployeeName, HigherDepartment ORDER BY MAX(level) DESC, PeckingOrder ASC level PeckingOrder Department EmployeeName HigherDepartment 3 1 1 Bart NULL 2 1 2 Homer 1 2 2 2 Marge NULL 1 1 3 Lisa 2 1 2 3 Maggie 2 1 3 3 Santas Helper 1 </code></pre>
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    1. COFYI: The recursive WITH is now the ANSI standard means of recursive & hierarchical queries. Oracle didn't support it till 11g R2 - it's had `CONNECT BY` since v2!
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    2. COI'm not surprised I didn't know that as "WITH" is so hard to google :)
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