oracle 层次查询判断叶子和根节点
2016-03-30 00:00
435 查看
oracle 9i判断是叶子或根节点，是比较麻烦的一件事情，SQL演示脚本如下:
view plain
copy to clipboard
print
?
DROP TABLE idb_hierarchical;
create TABLE idb_hierarchical
(
id number,
parent_id number,
str varchar2(10)
);
insert into idb_hierarchical values(1,null,'A');
insert into idb_hierarchical values(2,1,'B');
insert into idb_hierarchical values(3,2,'C');
insert into idb_hierarchical values(4,3,'D');
insert into idb_hierarchical values(5,2,'E');
insert into idb_hierarchical values(6,2,'F');
insert into idb_hierarchical values(7,3,'G');
insert into idb_hierarchical values(8,4,'H');
insert into idb_hierarchical values(9,4,'I');
insert into idb_hierarchical values(10,null,'J');
insert into idb_hierarchical values(11,10,'K');
insert into idb_hierarchical values(12,11,'L');
insert into idb_hierarchical values(13,10,'M');
示例数据清单如下:
view plain
copy to clipboard
print
?
SELECT RPAD('+',LEVEL*2+1,'.')||STR STR_LEVEL,ID,PARENT_ID,LEVEL LVL
FROM idb_hierarchical
START WITH PARENT_ID IS NULL
CONNECT BY PARENT_ID = PRIOR ID;
表1:数据清单
在表1中，ID为8、9、 7、5、6、12、13都没有子节点，因此称为叶节点。
view plain
copy to clipboard
print
?
SELECT RPAD('+',LEVEL*2+1,'.')||STR STR_LEVEL,ID,PARENT_ID,LEVEL LVL
FROM idb_hierarchical I
--在oracle 9i中显示叶节点，需要判断是否有子节点即可
WHERE NOT EXISTS(SELECT 1
FROM idb_hierarchical B
WHERE I.ID=B.PARENT_ID)
START WITH PARENT_ID IS NULL
CONNECT BY PARENT_ID = PRIOR ID;
表2
显示所有节点，标明该行是否为叶节点SQL
view plain
copy to clipboard
print
?
SELECT RPAD('+',LEVEL*2+1,'.')||STR STR_LEVEL,ID,PARENT_ID,LEVEL LVL,
NVL((SELECT 'N'
FROM idb_hierarchical B
WHERE I.ID=B.PARENT_ID
AND ROWNUM < 2),'Y') IS_LEAF
FROM idb_hierarchical I
START WITH PARENT_ID IS NULL
CONNECT BY PARENT_ID = PRIOR ID;
表3
copy to clipboard
print
?
SELECT RPAD('+',LEVEL*2+1,'.')||STR STR_LEVEL,ID,PARENT_ID,LEVEL LVL
FROM idb_hierarchical I
START WITH id =2
CONNECT BY PARENT_ID = PRIOR ID;
表4
根节点ID应该为3、5、6，即lvl为1即可
查询根节点，只显示根节点SQL
view plain
copy to clipboard
print
?
SELECT RPAD('+', LEVEL * 2 + 1, '.') || STR STR_LEVEL,
ID,
PARENT_ID,
LEVEL LVL,
(select b.str
from idb_hierarchical b
where level = 1
start with b.id = 2
connect by prior b.id = b.parent_id
) root_str
FROM idb_hierarchical I
where level = 1
START WITH id = 2
CONNECT BY PARENT_ID = PRIOR ID;
表5
标明根节点SQL
view plain
copy to clipboard
print
?
SELECT RPAD('+', LEVEL * 2 + 1, '.') || STR STR_LEVEL,
ID,
PARENT_ID,
DECODE(LEVEL, 1, 'Y', 'N') is_root,
LEVEL LVL,
(select b.str
from idb_hierarchical b
where level = 1
start with b.id = 2
connect by prior b.id = b.parent_id) root_str
FROM idb_hierarchical I
START WITH id = 2
CONNECT BY PARENT_ID = PRIOR ID;
表6
在oracle 10g提供了connect_by_isleaf和connect_by_root
copy to clipboard
print
?
SELECT RPAD('+',LEVEL*2+1,'.')||STR STR_LEVEL,ID,PARENT_ID,LEVEL LVL
FROM idb_hierarchical I
where connect_by_isleaf=1
START WITH PARENT_ID IS NULL
CONNECT BY PARENT_ID = PRIOR ID;
表7
view plain
copy to clipboard
print
?
SELECT RPAD('+',LEVEL*2+1,'.')||STR STR_LEVEL,ID,PARENT_ID,LEVEL LVL,
decode(connect_by_isleaf,1,'Y','N') IS_LEAF
FROM idb_hierarchical I
START WITH PARENT_ID IS NULL
CONNECT BY PARENT_ID = PRIOR ID;
表8
copy to clipboard
print
?
SELECT RPAD('+', LEVEL * 2 + 1, '.') || STR STR_LEVEL,
ID,
PARENT_ID,
LEVEL LVL,
connect_by_root STR ROOT_STR
FROM idb_hierarchical I
START WITH id = 2
CONNECT BY PARENT_ID = PRIOR ID;
表9
view plain
copy to clipboard
print
?
SELECT RPAD('+', LEVEL * 2 + 1, '.') || STR STR_LEVEL,
ID,
PARENT_ID,
DECODE(LEVEL, 1, 'Y', 'N') is_root,
LEVEL LVL,
connect_by_root STR ROOT_STR
FROM idb_hierarchical I
START WITH id = 3
CONNECT BY PARENT_ID = PRIOR ID;
表10
view plain
copy to clipboard
print
?
SELECT RPAD('+', LEVEL * 2 + 1, '.') || STR STR_LEVEL,
ID,
PARENT_ID,
DECODE(LEVEL, 1, 'Y', 'N') is_root,
LEVEL LVL,
connect_by_root STR ROOT_STR
FROM idb_hierarchical I
START WITH PARENT_ID = 2
CONNECT BY PARENT_ID = PRIOR ID;
表11
view plain
copy to clipboard
?
DROP TABLE idb_hierarchical;
create TABLE idb_hierarchical
(
id number,
parent_id number,
str varchar2(10)
);
insert into idb_hierarchical values(1,null,'A');
insert into idb_hierarchical values(2,1,'B');
insert into idb_hierarchical values(3,2,'C');
insert into idb_hierarchical values(4,3,'D');
insert into idb_hierarchical values(5,2,'E');
insert into idb_hierarchical values(6,2,'F');
insert into idb_hierarchical values(7,3,'G');
insert into idb_hierarchical values(8,4,'H');
insert into idb_hierarchical values(9,4,'I');
insert into idb_hierarchical values(10,null,'J');
insert into idb_hierarchical values(11,10,'K');
insert into idb_hierarchical values(12,11,'L');
insert into idb_hierarchical values(13,10,'M');
DROP TABLE idb_hierarchical; create TABLE idb_hierarchical ( id number, parent_id number, str varchar2(10) ); insert into idb_hierarchical values(1,null,'A'); insert into idb_hierarchical values(2,1,'B'); insert into idb_hierarchical values(3,2,'C'); insert into idb_hierarchical values(4,3,'D'); insert into idb_hierarchical values(5,2,'E'); insert into idb_hierarchical values(6,2,'F'); insert into idb_hierarchical values(7,3,'G'); insert into idb_hierarchical values(8,4,'H'); insert into idb_hierarchical values(9,4,'I'); insert into idb_hierarchical values(10,null,'J'); insert into idb_hierarchical values(11,10,'K'); insert into idb_hierarchical values(12,11,'L'); insert into idb_hierarchical values(13,10,'M');
示例数据清单如下:
view plain
copy to clipboard
?
SELECT RPAD('+',LEVEL*2+1,'.')||STR STR_LEVEL,ID,PARENT_ID,LEVEL LVL
FROM idb_hierarchical
START WITH PARENT_ID IS NULL
CONNECT BY PARENT_ID = PRIOR ID;
SELECT RPAD('+',LEVEL*2+1,'.')||STR STR_LEVEL,ID,PARENT_ID,LEVEL LVL
FROM idb_hierarchical
START WITH PARENT_ID IS NULL
CONNECT BY PARENT_ID = PRIOR ID;| STR_LEVEL | ID | PARENT_ID | LVL |
|---|---|---|---|
| +..A | 1 | 1 | |
| +….B | 2 | 1 | 2 |
| +……C | 3 | 2 | 3 |
| +……..D | 4 | 3 | 4 |
| +……….H | 8 | 4 | 5 |
| +……….I | 9 | 4 | 5 |
| +……..G | 7 | 3 | 4 |
| +……E | 5 | 2 | 3 |
| +……F | 6 | 2 | 3 |
| +..J | 10 | 1 | |
| +….K | 11 | 10 | 2 |
| +……L | 12 | 11 | 3 |
| +….M | 13 | 10 | 2 |
1.oracle9i 查询叶节点
只显示叶子节点SQLview plain
copy to clipboard
?
SELECT RPAD('+',LEVEL*2+1,'.')||STR STR_LEVEL,ID,PARENT_ID,LEVEL LVL
FROM idb_hierarchical I
--在oracle 9i中显示叶节点，需要判断是否有子节点即可
WHERE NOT EXISTS(SELECT 1
FROM idb_hierarchical B
WHERE I.ID=B.PARENT_ID)
START WITH PARENT_ID IS NULL
CONNECT BY PARENT_ID = PRIOR ID;
SELECT RPAD('+',LEVEL*2+1,'.')||STR STR_LEVEL,ID,PARENT_ID,LEVEL LVL
FROM idb_hierarchical I
--在oracle 9i中显示叶节点，需要判断是否有子节点即可
WHERE NOT EXISTS(SELECT 1
FROM idb_hierarchical B
WHERE I.ID=B.PARENT_ID)
START WITH PARENT_ID IS NULL
CONNECT BY PARENT_ID = PRIOR ID;| STR_LEVEL | ID | PARENT_ID | LVL |
| +……….H | 8 | 4 | 5 |
| +……….I | 9 | 4 | 5 |
| +……..G | 7 | 3 | 4 |
| +……E | 5 | 2 | 3 |
| +……F | 6 | 2 | 3 |
| +……L | 12 | 11 | 3 |
| +….M | 13 | 10 | 2 |
view plain
copy to clipboard
?
SELECT RPAD('+',LEVEL*2+1,'.')||STR STR_LEVEL,ID,PARENT_ID,LEVEL LVL,
NVL((SELECT 'N'
FROM idb_hierarchical B
WHERE I.ID=B.PARENT_ID
AND ROWNUM < 2),'Y') IS_LEAF
FROM idb_hierarchical I
START WITH PARENT_ID IS NULL
CONNECT BY PARENT_ID = PRIOR ID;
SELECT RPAD('+',LEVEL*2+1,'.')||STR STR_LEVEL,ID,PARENT_ID,LEVEL LVL,
NVL((SELECT 'N'
FROM idb_hierarchical B
WHERE I.ID=B.PARENT_ID
AND ROWNUM < 2),'Y') IS_LEAF
FROM idb_hierarchical I
START WITH PARENT_ID IS NULL
CONNECT BY PARENT_ID = PRIOR ID;| STR_LEVEL | ID | PARENT_ID | LVL | IS_LEAF |
| +..A | 1 | 1 | N | |
| +....B | 2 | 1 | 2 | N |
| +......C | 3 | 2 | 3 | N |
| +........D | 4 | 3 | 4 | N |
| +..........H | 8 | 4 | 5 | Y |
| +..........I | 9 | 4 | 5 | Y |
| +........G | 7 | 3 | 4 | Y |
| +......E | 5 | 2 | 3 | Y |
| +......F | 6 | 2 | 3 | Y |
| +..J | 10 | 1 | N | |
| +....K | 11 | 10 | 2 | N |
| +......L | 12 | 11 | 3 | Y |
| +....M | 13 | 10 | 2 | Y |
oracle 9i 查询根节点
view plaincopy to clipboard
?
SELECT RPAD('+',LEVEL*2+1,'.')||STR STR_LEVEL,ID,PARENT_ID,LEVEL LVL
FROM idb_hierarchical I
START WITH id =2
CONNECT BY PARENT_ID = PRIOR ID;
SELECT RPAD('+',LEVEL*2+1,'.')||STR STR_LEVEL,ID,PARENT_ID,LEVEL LVL
FROM idb_hierarchical I
START WITH id =2
CONNECT BY PARENT_ID = PRIOR ID;| STR_LEVEL | ID | PARENT_ID | LVL |
| +..B | 2 | 1 | 1 |
| +....C | 3 | 2 | 2 |
| +......D | 4 | 3 | 3 |
| +........H | 8 | 4 | 4 |
| +........I | 9 | 4 | 4 |
| +......G | 7 | 3 | 3 |
| +....E | 5 | 2 | 2 |
| +....F | 6 | 2 | 2 |
查询根节点，只显示根节点SQL
view plain
copy to clipboard
?
SELECT RPAD('+', LEVEL * 2 + 1, '.') || STR STR_LEVEL,
ID,
PARENT_ID,
LEVEL LVL,
(select b.str
from idb_hierarchical b
where level = 1
start with b.id = 2
connect by prior b.id = b.parent_id
) root_str
FROM idb_hierarchical I
where level = 1
START WITH id = 2
CONNECT BY PARENT_ID = PRIOR ID;
SELECT RPAD('+', LEVEL * 2 + 1, '.') || STR STR_LEVEL,
ID,
PARENT_ID,
LEVEL LVL,
(select b.str
from idb_hierarchical b
where level = 1
start with b.id = 2
connect by prior b.id = b.parent_id
) root_str
FROM idb_hierarchical I
where level = 1
START WITH id = 2
CONNECT BY PARENT_ID = PRIOR ID;| STR_LEVEL | ID | PARENT_ID | LVL | ROOT_STR |
| +..B | 2 | 1 | 1 | B |
view plain
copy to clipboard
?
SELECT RPAD('+', LEVEL * 2 + 1, '.') || STR STR_LEVEL,
ID,
PARENT_ID,
DECODE(LEVEL, 1, 'Y', 'N') is_root,
LEVEL LVL,
(select b.str
from idb_hierarchical b
where level = 1
start with b.id = 2
connect by prior b.id = b.parent_id) root_str
FROM idb_hierarchical I
START WITH id = 2
CONNECT BY PARENT_ID = PRIOR ID;
SELECT RPAD('+', LEVEL * 2 + 1, '.') || STR STR_LEVEL,
ID,
PARENT_ID,
DECODE(LEVEL, 1, 'Y', 'N') is_root,
LEVEL LVL,
(select b.str
from idb_hierarchical b
where level = 1
start with b.id = 2
connect by prior b.id = b.parent_id) root_str
FROM idb_hierarchical I
START WITH id = 2
CONNECT BY PARENT_ID = PRIOR ID;| STR_LEVEL | ID | PARENT_ID | IS_ROOT | LVL | ROOT_STR |
| +..B | 2 | 1 | Y | 1 | B |
| +....C | 3 | 2 | N | 2 | B |
| +......D | 4 | 3 | N | 3 | B |
| +........H | 8 | 4 | N | 4 | B |
| +........I | 9 | 4 | N | 4 | B |
| +......G | 7 | 3 | N | 3 | B |
| +....E | 5 | 2 | N | 2 | B |
| +....F | 6 | 2 | N | 2 | B |
oracle 10g用connect_by_isleaf判断叶节点
view plaincopy to clipboard
?
SELECT RPAD('+',LEVEL*2+1,'.')||STR STR_LEVEL,ID,PARENT_ID,LEVEL LVL
FROM idb_hierarchical I
where connect_by_isleaf=1
START WITH PARENT_ID IS NULL
CONNECT BY PARENT_ID = PRIOR ID;
SELECT RPAD('+',LEVEL*2+1,'.')||STR STR_LEVEL,ID,PARENT_ID,LEVEL LVL
FROM idb_hierarchical I
where connect_by_isleaf=1
START WITH PARENT_ID IS NULL
CONNECT BY PARENT_ID = PRIOR ID;| STR_LEVEL | ID | PARENT_ID | LVL |
| +..........H | 8 | 4 | 5 |
| +..........I | 9 | 4 | 5 |
| +........G | 7 | 3 | 4 |
| +......E | 5 | 2 | 3 |
| +......F | 6 | 2 | 3 |
| +......L | 12 | 11 | 3 |
| +....M | 13 | 10 | 2 |
copy to clipboard
?
SELECT RPAD('+',LEVEL*2+1,'.')||STR STR_LEVEL,ID,PARENT_ID,LEVEL LVL,
decode(connect_by_isleaf,1,'Y','N') IS_LEAF
FROM idb_hierarchical I
START WITH PARENT_ID IS NULL
CONNECT BY PARENT_ID = PRIOR ID;
SELECT RPAD('+',LEVEL*2+1,'.')||STR STR_LEVEL,ID,PARENT_ID,LEVEL LVL,
decode(connect_by_isleaf,1,'Y','N') IS_LEAF
FROM idb_hierarchical I
START WITH PARENT_ID IS NULL
CONNECT BY PARENT_ID = PRIOR ID;| STR_LEVEL | ID | PARENT_ID | LVL | IS_LEAF |
| +..A | 1 | 1 | N | |
| +....B | 2 | 1 | 2 | N |
| +......C | 3 | 2 | 3 | N |
| +........D | 4 | 3 | 4 | N |
| +..........H | 8 | 4 | 5 | Y |
| +..........I | 9 | 4 | 5 | Y |
| +........G | 7 | 3 | 4 | Y |
| +......E | 5 | 2 | 3 | Y |
| +......F | 6 | 2 | 3 | Y |
| +..J | 10 | 1 | N | |
| +....K | 11 | 10 | 2 | N |
| +......L | 12 | 11 | 3 | Y |
| +....M | 13 | 10 | 2 | Y |
oracle 10g用connect_by_root判断根节点
view plaincopy to clipboard
?
SELECT RPAD('+', LEVEL * 2 + 1, '.') || STR STR_LEVEL,
ID,
PARENT_ID,
LEVEL LVL,
connect_by_root STR ROOT_STR
FROM idb_hierarchical I
START WITH id = 2
CONNECT BY PARENT_ID = PRIOR ID;
SELECT RPAD('+', LEVEL * 2 + 1, '.') || STR STR_LEVEL,
ID,
PARENT_ID,
LEVEL LVL,
connect_by_root STR ROOT_STR
FROM idb_hierarchical I
START WITH id = 2
CONNECT BY PARENT_ID = PRIOR ID;| STR_LEVEL | ID | PARENT_ID | LVL | ROOT_STR |
|---|---|---|---|---|
| +..B | 2 | 1 | 1 | B |
| +....C | 3 | 2 | 2 | B |
| +......D | 4 | 3 | 3 | B |
| +........H | 8 | 4 | 4 | B |
| +........I | 9 | 4 | 4 | B |
| +......G | 7 | 3 | 3 | B |
| +....E | 5 | 2 | 2 | B |
| +....F | 6 | 2 | 2 | B |
copy to clipboard
?
SELECT RPAD('+', LEVEL * 2 + 1, '.') || STR STR_LEVEL,
ID,
PARENT_ID,
DECODE(LEVEL, 1, 'Y', 'N') is_root,
LEVEL LVL,
connect_by_root STR ROOT_STR
FROM idb_hierarchical I
START WITH id = 3
CONNECT BY PARENT_ID = PRIOR ID;
SELECT RPAD('+', LEVEL * 2 + 1, '.') || STR STR_LEVEL,
ID,
PARENT_ID,
DECODE(LEVEL, 1, 'Y', 'N') is_root,
LEVEL LVL,
connect_by_root STR ROOT_STR
FROM idb_hierarchical I
START WITH id = 3
CONNECT BY PARENT_ID = PRIOR ID;| STR_LEVEL | ID | PARENT_ID | IS_ROOT | LVL | ROOT_STR |
|---|---|---|---|---|---|
| +..C | 3 | 2 | Y | 1 | C |
| +....D | 4 | 3 | N | 2 | C |
| +......H | 8 | 4 | N | 3 | C |
| +......I | 9 | 4 | N | 3 | C |
| +....G | 7 | 3 | N | 2 | C |
copy to clipboard
?
SELECT RPAD('+', LEVEL * 2 + 1, '.') || STR STR_LEVEL,
ID,
PARENT_ID,
DECODE(LEVEL, 1, 'Y', 'N') is_root,
LEVEL LVL,
connect_by_root STR ROOT_STR
FROM idb_hierarchical I
START WITH PARENT_ID = 2
CONNECT BY PARENT_ID = PRIOR ID;
SELECT RPAD('+', LEVEL * 2 + 1, '.') || STR STR_LEVEL,
ID,
PARENT_ID,
DECODE(LEVEL, 1, 'Y', 'N') is_root,
LEVEL LVL,
connect_by_root STR ROOT_STR
FROM idb_hierarchical I
START WITH PARENT_ID = 2
CONNECT BY PARENT_ID = PRIOR ID;| STR_LEVEL | ID | PARENT_ID | IS_ROOT | LVL | ROOT_STR |
|---|---|---|---|---|---|
| +..C | 3 | 2 | Y | 1 | C |
| +....D | 4 | 3 | N | 2 | C |
| +......H | 8 | 4 | N | 3 | C |
| +......I | 9 | 4 | N | 3 | C |
| +....G | 7 | 3 | N | 2 | C |
| +..E | 5 | 2 | Y | 1 | E |
| +..F | 6 | 2 | Y | 1 | F |
内容来自用户分享和网络整理，不保证内容的准确性，如有侵权内容，可联系管理员处理 
相关文章推荐
- PowerDesigner oracle 反向工程到cdm文件
- Oracle 排序中使用nulls first 或者nulls last 语法
- Oracle数据的导出与导入
- oracle 远程连接超时问题
- Oracle自定义聚集函数
- oracle数据库的备份与恢复
- 关于oracle分组后组外排序的问题
- Oracle 数据库类型和java 类型以及jdbc类型对照
- 40.Oracle深度学习笔记——全库备份常用
- 39.Oracle深度学习笔记——自动创建ASM UDEV设备脚本
- 38.Oracle深度学习笔记——OS下关闭连接进程脚本
- Oracle学习(六)----子查询
- Oracle SQL 经典查询练手第二篇
- Oracle 常见的SQL调优
- asp.net用npoi读取ecxel数据到oracle表
- 验证ORACLE不同字符集中汉字占用的byte及NLS_LENGTH_SEMANTICS参数的影响
- oracle中的char、varchar、varchar2、nvarchar、nvarchar2区别
- oracle聚簇表
- Centos6.5安装Oracle12c安装笔记
- oracle三层嵌套来实现分页