父子表结构查询

-- 根据父ID得到所有子ID -- Get childs by parent id WITH Tree AS ( SELECT Id,ParentId FROM dbo.Node P WHERE P.Id = 21 -- parent id，即父记录

UNION ALL SELECT C.Id,C.ParentId FROM dbo.Node C INNER JOIN Tree T ON C.ParentId = T.Id -- 所有子记录 ) SELECT * FROM Tree -- Tree包含父子记录

-- 根据子ID得到所有父ID

-- Get parents by child id WITH Tree AS ( SELECT Id,ParentId FROM dbo.Node C WHERE C.Id = 57 -- child id，即子记录

UNION ALL SELECT P.Id,P.ParentId FROM dbo.Node P INNER JOIN Tree T ON P.Id = T.ParentId -- 所有父记录 ) SELECT * FROM Tree -- Tree包含父子记录