sqlServer 2005 sql2005 sql树形,子节点查找最上级,顶级节点,忽略中间节点
create table tb(id varchar(3) , pid varchar(3) , name varchar(10))insert into tb values('001' , null , '广东省')insert into tb values('002' , '001' , '广州市')insert into tb values('003' , '001' , '深圳市')insert into tb values('004' , '002' , '天河区')insert into tb values('005' , '003' , '罗湖区')insert into tb values('006' , '003' , '福田区')insert into tb values('007' , '003' , '宝安区')insert into tb values('008' , '007' , '西乡镇')insert into tb values('009' , '007' , '龙华镇')insert into tb values('010' , '007' , '松岗镇')go--查询指定节点最上级父节点的函数create function f_pid(@id varchar(3)) returns @t_level table(id varchar(3))asbegin insert into @t_level select @id select @id = pid from tb where id = @id and pid is not null while @@ROWCOUNT > 0 begin delete from @t_level insert into @t_level select @id select @id = pid from tb where id = @id and pid is not null end returnendgo--调用函数查询005(罗湖区)的最上级父节点select a.* from tb a , f_pid('005') b where a.id = b.id /*id pid name ---- ---- ---------- 001 NULL 广东省（所影响的行数为 1 行）*/--调用函数查询002(广州市)的最上级父节点select a.* from tb a , f_pid('002') b where a.id = b.id /*id pid name ---- ---- ---------- 001 NULL 广东省（所影响的行数为 1 行）*/--调用函数查询001(广东省)的最上级父节点select a.* from tb a , f_pid('001') b where a.id = b.id /*id pid name ---- ---- ---------- 001 NULL 广东省（所影响的行数为 1 行）drop table tbdrop function f_pid*/