Question

我正在开发SQL或PL / SQL中的Query，如下所示。我尝试过以下查询

SELECT     RPAD ('* ', LEVEL*2, '* ')
 FROM DUAL
CONNECT BY LEVEL <= 5 
UNION all
SELECT   RPAD ('* ', LEVEL*2, '* ')
 FROM DUAL
CONNECT BY LEVEL <= 5;

但我得到的输出就是这种形式。

* 
* * 
* * * 
* * * * 
* * * * * 
* 
* * 
* * * 
* * * * 
* * * * *

但我需要的输出格式是

* 
* * 
* * * 
* * * * 
* * * * *
* * * * 
* * * 
* * 
*

任何人都可以帮我这个。

Answer 1

这个怎么样：

SELECT     RPAD ('* ', LEVEL*2, '* ')
FROM       DUAL
CONNECT BY LEVEL <= 5 
UNION all
SELECT   RPAD ('* ', (5-LEVEL)*2, '* ')
FROM DUAL
CONNECT BY LEVEL <= 5;

Answer 2

我认为这是正确的。

SELECT     RPAD (' ', LEVEL*2, ' ')
FROM       DUAL
CONNECT BY LEVEL <= 5 
UNION all
SELECT   RPAD (' ', (5-LEVEL)*2, ' ')
FROM DUAL
CONNECT BY LEVEL <= 5-1;

希望它可以帮助你...... !!

查询在SQL或PL / SQL中为给定的N值打印三角形星号（星号）

2 个答案: