求教一条sql语句，特急
现在有一张表
PARENT_CD CHILD_CD SQ Name
10CAAAA 30CAAAA 1 AA
10CAAAA AAAA 2 BB
10CAAAA AAAA 3 CC
10CAAAA AAAA 4 DD
30CAAAA 70CAAAA 1 EE
30CAAAA BBBB 2 FF
30CAAAA BBBB 3 GG
70CAAAA CCCC 1 HH
70CAAAA CCCC 2 JJ
70CAAAA CCCC 3 KK
现在想要得带这样的结果：
属于10CAAAA 编号下的所有子编号，但是30C 70C 不要显示，只显示他下面的子编号
就是：
CHILD_CD SQ Name
AAAA 2 BB
AAAA 3 CC
AAAA 4 DD
BBBB 2 FF
BBBB 3 GG
CCCC 1 HH
CCCC 2 JJ
CCCC 3 KK
[解决办法]
select (case when c.child_cd is not null then c.child_cd
when c.child_cd is null and b.child_cd is not null then b.child_cd
when c.child_cd is null and b.child_cd is null then a.child_cd
end)child_cd
,(case when c.child_cd is not null then c.sq
when c.child_cd is null and b.child_cd is not null then b.sq
when c.child_cd is null and b.child_cd is null then a.sq
end)sq
,(case when c.child_cd is not null then c.name
when c.child_cd is null and b.child_cd is not null then b.name
when c.child_cd is null and b.child_cd is null then a.name
end)name
from tb a
left join tb b on a.child_cd = b.parent_cd
left join tb c on b.child_cd = c.parent_cd
where a.parent_cd = '10caaa'
[解决办法]
真没太明白楼主的意思.
[解决办法]
[code=SQL]
USE tempdb
GO
-- 建立演示环境
CREATE TABLE Dept(
id int PRIMARY KEY,
parent_id int,
name nvarchar(20))
INSERT Dept
SELECT 0, 0, N'<全部>' UNION ALL
SELECT 1, 0, N'财务部' UNION ALL
SELECT 2, 0, N'行政部' UNION ALL
SELECT 3, 0, N'业务部' UNION ALL
SELECT 4, 0, N'业务部' UNION ALL
SELECT 5, 4, N'销售部' UNION ALL
SELECT 6, 4, N'MIS' UNION ALL
SELECT 7, 6, N'UI' UNION ALL
SELECT 8, 6, N'软件开发' UNION ALL
SELECT 9, 8, N'内部开发'
GO
-- 查询指定部门下面的所有部门
DECLARE @Dept_name nvarchar(20)
SET @Dept_name = N'MIS'
;WITH
DEPTS AS(
-- 定位点成员
SELECT * FROM Dept
WHERE name = @Dept_name
UNION ALL
-- 递归成员, 通过引用CTE自身与Dept基表JOIN实现递归
SELECT A.*
FROM Dept A, DEPTS B
WHERE A.parent_id = B.id
)
SELECT * FROM DEPTS
GO
-- 删除演示环境
DROP TABLE Dept
----CTE的综合应用
USE tempdb
GO
-- 建立演示环境
CREATE TABLE Dept(
id int PRIMARY KEY,
parent_id int,
name nvarchar(20))
INSERT Dept
SELECT 0, 0, N'<全部>' UNION ALL
SELECT 1, 0, N'财务部' UNION ALL
SELECT 2, 0, N'行政部' UNION ALL
SELECT 3, 0, N'业务部' UNION ALL
SELECT 4, 0, N'业务部' UNION ALL
SELECT 5, 4, N'销售部' UNION ALL
SELECT 6, 4, N'MIS' UNION ALL
SELECT 7, 6, N'UI' UNION ALL
SELECT 8, 6, N'软件开发' UNION ALL
SELECT 9, 8, N'内部开发'
GO
-- 查询指定部门下面的所有部门, 并汇总各部门的下级部门数
DECLARE @Dept_name nvarchar(20)
SET @Dept_name = N'MIS'
;WITH
DEPTS AS( -- 查询指定部门及其下的所有子部门
-- 定位点成员
SELECT * FROM Dept
WHERE name = @Dept_name
UNION ALL
-- 递归成员, 通过引用CTE自身与Dept基表JOIN实现递归
SELECT A.*
FROM Dept A, DEPTS B
WHERE A.parent_id = B.id
),
DEPTCHILD AS( -- 引用第1个CTE,查询其每条记录对应的部门下的所有子部门
SELECT
Dept_id = P.id, C.id, C.parent_id
FROM DEPTS P, Dept C
WHERE P.id = C.parent_id
UNION ALL
SELECT
P.Dept_id, C.id, C.parent_id
FROM DEPTCHILD P, Dept C
WHERE P.id = C.parent_id
),
DEPTCHILDCNT AS( -- 引用第2个CTE, 汇总得到各部门下的子部门数
SELECT
Dept_id, Cnt = COUNT(*)
FROM DEPTCHILD
GROUP BY Dept_id
)
SELECT -- JOIN第1,3个CTE,得到最终的查询结果
D.*,
ChildDeptCount = ISNULL(DS.Cnt, 0)
FROM DEPTS D
LEFT JOIN DEPTCHILDCNT DS
ON D.id = DS.Dept_id
GO
-- 删除演示环境
DROP TABLE Dept
e]
[解决办法]
MSSQL2005及以上版本：
create table t1
(
pid varchar(10),
cid varchar(10),
sq int,
name varchar(2)
)
insert into t1
select '10CAAAA', '30CAAAA', 1, 'AA' union all
select '10CAAAA', 'AAAA', 2, 'BB' union all
select '10CAAAA', 'AAAA', 3, 'CC' union all
select '10CAAAA', 'AAAA', 4, 'DD' union all
select '30CAAAA', '70CAAAA', 1, 'EE' union all
select '30CAAAA', 'BBBB', 2, 'FF' union all
select '30CAAAA', 'BBBB', 3, 'GG' union all
select '70CAAAA', 'CCCC', 1, 'HH' union all
select '70CAAAA', 'CCCC', 2, 'JJ' union all
select '70CAAAA', 'CCCC', 3, 'KK'
select * from t1
;with aaa as
(
select * from t1 where pid='10CAAAA'
union all
select a.* from t1 as a inner join aaa as b on a.pid=b.cid
)
select cid,sq,name from aaa where LEN(cid)<5
------------------------------
cidsqname
AAAA2BB
AAAA3CC
AAAA4DD
BBBB2FF
BBBB3GG
CCCC1HH
CCCC2JJ
CCCC3KK
