幫助與SQL查詢計數

Question

我有類似以下

ID NUMBER 
VAL1 NUMBER 
VAL2 NUMBER 

我需要顯示有VAL1> VAL2和有VAL1 VAL2 <行計數的行數的SQL查詢的表。兩者都使用一個SQL查詢計數。謝謝。

Answer 1

該查詢應與大多數數據庫平臺上工作：

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

，顯示不同行的總和，你可以這樣做：

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

試試這個：

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