SQL SERVER递归查询的实现

with 子查询名称 查询字段列表 as --查询字段列表输入格式为([查询字段名1],[查询字段名2],...)，也可用*代替，需要注意的是此处的查询字段列表中的字段与下方内容中定点成员与递归成员查询字段列表内容需一致
( 
--定点成员
select 查询字段列表 from 查询表名 where 查询条件 
union all 
--递归成员
select 查询字段列表 from 查询表名 a inner join 子查询名称 on 递归条件 ) 
select 显示字段名 from 子查询名称

--查询1
--通过根节点向下查找该根节点下的子节点
with temp([id],[departmentName],[parentId])  as --temp([id],[departmentName])指定temp结果集中的列，如设置需包含联表条件
( select [id],[departmentName],[parentId] from SYS_Department where id = 2
union all select a.[id],a.[departmentName],a.[parentId] from SYS_Department a inner join temp on a.[parentId] = temp.[id] ) 
select  [id],[departmentName] from temp

--查询2
--通过子节点向上查找该子节点的根节点
with temp([id],[departmentName],[parentId])  as 
( select [id],[departmentName],[parentId] from SYS_Department where id = 2
union all select a.[id],a.[departmentName],a.[parentId] from SYS_Department a inner join temp on
--调换查询字段
a.[id] = temp.[parentId] ) 
select  [id],[departmentName] from temp

--Mysql 查询时联表条件与SQL SERVER相反
--父查子
with recursive temp(Id,DepartmentName,ParentId) as 
(select Id,DepartmentName,ParentId from SYS_Department  where id = 2
union all 
select a.Id,a.DepartmentName,a.ParentId from SYS_Department a inner join temp on a.ParentId  = temp.Id)
select * from temp

--子查父
with recursive temp(Id,DepartmentName,ParentId) as 
(select Id,DepartmentName,ParentId from SYS_Department  where id = 2
union all 
select a.Id,a.DepartmentName,a.ParentId from SYS_Department a inner join temp on a.Id = temp.ParentId )
select * from temp

--查询1
--不指定子查询查询字段列表
with temp as 
(
--查询表中所有字段 
select * from SYS_Department where id = 2
union all 
--查询主表中所有字段（根据UNION ALL语法需与定点成员查询字段保持一致）
select a.* from SYS_Department a inner join temp on a.[parentId] = temp.[id] ) 
--显示表中所有字段
select * from temp

--查询2
--不指定子查询查询字段列表
with temp as 
(
--查询表中所有字段 
select * from SYS_Department where id = 2
union all 
--查询主表中所有字段（根据UNION ALL语法需与定点成员查询字段保持一致）
select a.* from SYS_Department a inner join temp on a.[parentId] = temp.[id] ) 
--显示表中id字段
select id from temp