Get All Parent and Child Companies (plus child of child companies) up to Nth level

Get All Parent and Child Companies (plus child of child companies) up to Nth level using recursive CTE


declare @companyId int
set @companyId = 1
;WITH cte
AS
(
    SELECT CompanyId, CompanyName, ParentCompanyId, 0 as steps
    FROM dbo.Company
    --WHERE ParentCompanyId IS NOT NULL
     WHERE companyid = @companyId
  UNION ALL
    SELECT  c.CompanyId, c.CompanyName, c.ParentCompanyId, cte.steps +1 as steps
    FROM dbo.Company AS c
    inner JOIN cte ON cte.CompanyId = c.ParentCompanyId
)
SELECT CompanyId, CompanyName, ParentCompanyId, steps
FROM cte;

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