帮助与SQL查询计数

Question

我有类似以下

ID NUMBER 
VAL1 NUMBER 
VAL2 NUMBER 

我需要显示有VAL1> VAL2和有VAL1 VAL2 <行计数的行数的SQL查询的表。两者都使用一个SQL查询计数。谢谢。

Answer 1

该查询应与大多数数据库平台上工作：

select sum(case when val1 > val2 then 1 end) as GreaterThanCount, 
    sum(case when val1 < val2 then 1 end) as LessThanCount 
from MyTable 

，显示不同行的总和，你可以这样做：

select case when val1 > val2 then 'GreaterThan' else 'LessThan' end as Type, 
    count(*) as Count 
from MyTable  
group by case when val1 > val2 then 'GreaterThan' else 'LessThan' end 

Answer 2

试试这个：

select id, count(VAL1 > VAL2) as more1, count(val2 > val1) as more2 
from your_table 

Answer 3

SELECT SUM（VAL1> VAL2）as arg1， SUM（VAL1 < VAL2）as arg2