sys_connect_by_path equivalent in sql

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SQL-Server-2008R2

I have used sys_connect_by_path in ORACLE query.Now I want to convert it to sql server.

SQL

(select type_id,id,cast(name,'\') obs_name  from  prj_obs_units 
start with  id in ( select id  from prj_obs_units  where parent_id is  null )
connect  by  prior id=parent_id)

can you tell me how to convert this into sql server query , Thanks in Advance.

Posted 29-Sep-14 19:32pm

charan1431

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PhilLenoir · Answer 1 · 2014-10-02T11:05:00

You will have to use a recursive Common Table Expression (CTE). I don't have your schema, but I believe from your Oracle query that this will yield the same result:

SQL

WITH MyCTE(type_id, id, obs_name)AS
(SELECT type_id, id, CAST([name] AS varchar(1024)) 
FROM prj_obs_units 
WHERE id parent_id IS NULL
UNION ALL
SELECT c.type_id, c.id, CAST(p.obs_name + '\' + c.[name] AS varchar(1024))
FROM prj_obs_units AS c INNER JOIN MyCTE AS p ON c.parent_id = p.id)

SELECT type_id, id, obs_name
FROM MyCTE