Oracle将行重复N次,其中N是列 [英] Oracle duplicate row N times where N is a column
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问题描述
我是Oracle的新手,我正在尝试做一些不寻常的事情.给定此表和数据,我需要选择每一行,并复制DupCount大于1的行.
I'm new to Oracle and I'm trying to do something a little unusual. Given this table and data I need to select each row, and duplicate ones where DupCount is greater than 1.
create table TestTable
(
Name VARCHAR(10),
DupCount NUMBER
)
INSERT INTO TestTable VALUES ('Jane', 1);
INSERT INTO TestTable VALUES ('Mark', 2);
INSERT INTO TestTable VALUES ('Steve', 1);
INSERT INTO TestTable VALUES ('Jeff', 3);
所需结果:
Name DupCount
--------- -----------
Jane 1
Mark 2
Mark 2
Steve 1
Jeff 3
Jeff 3
Jeff 3
如果通过单个select语句无法做到这一点,将非常感谢有关存储过程的帮助.
If this isn't possible via a single select statement any help with a stored procedure would be greatly appreciated.
推荐答案
您可以通过分层查询来做到这一点:
You can do it with a hierarchical query:
查询1 :
WITH levels AS (
SELECT LEVEL AS lvl
FROM DUAL
CONNECT BY LEVEL <= ( SELECT MAX( DupCount ) FROM TestTable )
)
SELECT Name,
DupCount
FROM TestTable
INNER JOIN
levels
ON ( lvl <= DupCount )
ORDER BY Name
结果 :
Results:
| NAME | DUPCOUNT |
|-------|----------|
| Jane | 1 |
| Jeff | 3 |
| Jeff | 3 |
| Jeff | 3 |
| Mark | 2 |
| Mark | 2 |
| Steve | 1 |
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