選擇

Question

我有選擇

SELECT e.*, b.f1, b.fee FROM eq e JOIN br b ON e.country = b.country 
WHERE e.name= 'some' AND b.fee = 1 

我需要重寫選擇一個替代AND b.fee = 1到AND b.fee = min fee from b

我不能....我可以AND b.fee = (SELECT MIN(fee)FROM br)但不好解決

Answer 1

如果你只想要一個行，那麼就使用limit：

SELECT e.*, b.f1, b.fee 
FROM eq e JOIN 
    br b 
    ON e.country = b.country 
WHERE e.name = 'some' 
ORDER BY b.fee 
LIMIT 1; 

如果你想以最小的自由都行，那麼這裏是一個方法：

SELECT e.*, b.f1, b.fee 
FROM eq e JOIN 
    (SELECT b.*, MIN(fee) OVER() as minfee 
     FROM br b 
    ) b 
    ON e.country = b.country 
WHERE e.name = 'some' AND b.fee = minfee;