计数重复记录不同的列名

Question

嗨，我在SQL的新手，这是我的问题：我有这个表：

rhp1 ---- ---- rhp2 --- rhp3 -rhp4 --- rhp5 .....

51 ------- 32 ------ 61 ------ 54 ----- 32 ....

21 ------- 95 ------ 125 ----- 25 ----- 45 ...

65 ------- 58 ---- --- 58 ----- 69 ----- 25 ...

我想统计这个表中重复的每个字段值多少！例如：51第一场，我们有多少51在此表和....

与此查询我可以在一列中得到这样的：

select rhp , count(1) as count_rhp from tbl_all 
group by rhp 
order by count_rhp Desc 

我如何能做到这一点的整桌子？

Answer 1

联盟中的所有列进一个，然后按组和计数：

with tbl_all (rhp) as 
(
select rhp1 from tbl union all 
select rhp2 from tbl union all 
select rhp3 from tbl union all 
select rhp4 from tbl union all 
select rhp5 from tbl 
) 
select rhp , count(1) as count_rhp 
from tbl_all 
group by rhp 
order by count_rhp Desc