的Oralce凡克勞斯在查詢

Question

Emp_id, sal, age, exp 
1  2 21 9 
2  2 21 9 
3  2 22 9 
4  2 33 9 
5  2 33 10 


select sum(sal) from emp_table where age in (21,22,33,...); 

Need to add some condition 
for age 21 No condition 
for age 22 No condition 
for age 33 exp > 10; 

所需的輸出：SUM（SAL）：8 我怎麼能在Oracle中實現這一單查詢

Answer 1

你需要用的線東西分裂IN語句：

select sum(sal) from emp_table where (age = 21 AND some_condition) OR age = 22 OR (age = 33 AND exp>10) 

Answer 2

你的條件可以改寫成如下的形式：

select sum(sal) 
from emp_table 
where age = 21 or age = 22 or age = 33; 

因此，如果您需要任何後續條件添加到每個age表達，那麼你將其添加到括號，並使用AND例如像這樣

select sum(sal) 
from emp_table 
where age = 21 or 
     age = 22 or 
     (age = 33 AND exp > 10); 

編輯：如果你想在保持那麼我會做到以下幾點：

SELECT sum(sal) 
FROM emp_table 
WHERE age IN (21, 22) OR 
     (age = 33 AND exp > 10); 

Answer 3

SELECT sum(sal) 
FROM emp_table 
WHERE age IN (21, 22) OR 
(age = 33 AND exp > 10); 

試試這個。