我们可以通过wm_concat函数可以实现行转列：

 select s_info_windcode,rate from OptionEmbeddedBondRate where 
 s_info_windcode = '110031.SH'

目前库中的数据是如下图所示：

要转换成如下图所示的数据：

这时就可以通过wm_concat函数进行转换，具体sql如下：

select s_info_windcode,WM_CONCAT(rate) rate from OptionEmbeddedBondRate
WHERE s_info_windcode ='110031.SH'
GROUP BY s_info_windcode

上述结果集中会有一个问题，那就是在number类型转换成varchar类型时， .前面的0会被自动省略掉，为了解决这个问题，我们将参数rate做一下判断：

decode(substr((to_char(rate)),0,1),'.','0'||to_char(rate),to_char(rate))

最终的代码就如下所示：

select s_info_windcode,WM_CONCAT(decode(substr((to_char(rate)),0,1),'.','0'||to_char(rate),to_char(rate))) rate from OptionEmbeddedBondRate
WHERE s_info_windcode ='110031.SH'
GROUP BY s_info_windcode

下面则是最终聚集后的结果集：

当然，我们也可以为rate里面的数字集合做一个排序，当使用WM_CONCAT函数时，排序只能是先通过over(partition by … order by …)函数去做，然后再通过聚集函数max去取，具体的sql如下：

select s_info_windcode,MAX(to_char(M)) as RATE
	from (select 
			s_info_windcode,
			WM_CONCAT(decode(substr((to_char(rate)),0,1),'.','0'||to_char(rate),to_char(rate))) over(partition by s_info_windcode order by rate) m 
			from OptionEmbeddedBondRate 
			WHERE s_info_windcode ='110031.SH') 
	group by s_info_windcode;

具体的结果集如下：