グループで演算子以上の演算子を使用できますか？

Question

sqlでgroup by演算子以上の演算子を使用する方法を教えてください。

Answer 1

あなたがやりたいものは何でも、これは私が考えることができる唯一のものです：あなたは、GROUP BY句WITH>演算子を使用して話をしている場合は

... 
GROUP BY 
    CASE WHEN A >= 1 THEN 1 
    ELSE 0 
    END 

Answer 2

：

select 
case when age between 0 and 20 then '0 - 20' 
    when age between 21 and 40 then '21 - 40' 
else '> 40' end age, 
sum(case when survived = 1 then else 0 end) survivors 
from rms_titanic 
group by 
case when age between 0 and 20 then '0 - 20' 
    when age between 21 and 40 then '21 - 40' 
else '> 40' 
order by 
case when age between 0 and 20 then '0 - 20' 
    when age between 21 and 40 then '21 - 40' 
else '> 40'; 

を

これは以下のように書くことができるあなたがGROUP BYの結果セットに>演算子を使用したい場合はトン、しかし

select 
case when age between 0 and 20 then '0 - 20' 
    when age between 21 and 40 then '21 - 40' 
else '> 40' end age, 
sum(case when survived = 1 then else 0 end) survivors 
from rms_titanic 
group by 1 
order by 1; 

あなたはHAVING句を含める必要があります：

select 
case when age between 0 and 20 then '0 - 20' 
    when age between 21 and 40 then '21 - 40' 
else '> 40' end age, 
passenger_class, 
sum(case when survived = 1 then else 0 end) survivors 
from rms_titanic 
group by 1, passenger_class having count(*) > 20 
order by 1;