SQL选择错误

我正在尝试获取两个随机城市之间价格最低的航班的

航班id

。最后一行出现错误

having子句中的未知列

当我尝试使用where/from时，错误显示：

组函数的使用无效

---

有什么想法吗

如果您需要基于订单的第一条记录，只需根据rdbms使用

选择TOP 1

或

TAKE 1

，并按您需要订购的字段进行订购

SQL SERVER 2008

SELECT f.flight_id 
FROM flights f 
JOIN flightsinfo AS i ON f.flight_code = i.flight_code
JOIN airports AS a ON i.dep_airport_id = a.airport_id 
JOIN cities as c ON a.city_id = c.city_id AND city_name = 'New York'
JOIN airports AS b ON i.arr_airport_id = b.airport_id
JOIN cities AS v ON v.city_id = b.city_id AND v.city_name = 'Budapest'
HAVING f.price = MIN(price)

MySQL

SELECT TOP 1
    f.flight_id
FROM
    flights f
    JOIN flightsinfo AS i ON f.flight_code = i.flight_code
    JOIN airports AS a ON i.dep_airport_id = a.airport_id
    JOIN cities AS c ON a.city_id = c.city_id
                        AND city_name = 'New York'
    JOIN airports AS b ON i.arr_airport_id = b.airport_id
    JOIN cities AS v ON v.city_id = b.city_id
                        AND v.city_name = 'Budapest'
ORDER BY 
    f.price

---

使用公共表表达式（cte）查找价格最低的航班。（如果平局，将返回两个航班。）

或者，JamieD77答案的ANSI SQL版本：

WITH CTE (flight_id, price) AS
(
SELECT f.flight_id, f.price
FROM flights f 
JOIN flightsinfo AS i ON f.flight_code = i.flight_code
JOIN airports AS a ON i.dep_airport_id = a.airport_id 
JOIN cities as c ON a.city_id = c.city_id AND city_name = 'New York'
JOIN airports AS b ON i.arr_airport_id = b.airport_id
JOIN cities AS v ON v.city_id = b.city_id AND v.city_name = 'Budapest'
)
select flight_id, price
from cte
where price = (select min(price) from cte)

---

带有TIES的

表示如果是tie，将返回多行

您不能在

where

子句中使用“裸”聚合函数，例如

min

。您可以只

按f.price选择前1个订单

您是否尝试过：让f.price=min（f.price）请标记使用的dbms。答案可能取决于它！

WITH CTE (flight_id, price) AS
(
SELECT f.flight_id, f.price
FROM flights f 
JOIN flightsinfo AS i ON f.flight_code = i.flight_code
JOIN airports AS a ON i.dep_airport_id = a.airport_id 
JOIN cities as c ON a.city_id = c.city_id AND city_name = 'New York'
JOIN airports AS b ON i.arr_airport_id = b.airport_id
JOIN cities AS v ON v.city_id = b.city_id AND v.city_name = 'Budapest'
)
select flight_id, price
from cte
where price = (select min(price) from cte)

SELECT 
    f.flight_id
FROM
    flights AS f
    JOIN flightsinfo AS i ON f.flight_code = i.flight_code
    JOIN airports AS a ON i.dep_airport_id = a.airport_id
    JOIN cities AS c ON a.city_id = c.city_id
                        AND city_name = 'New York'
    JOIN airports AS b ON i.arr_airport_id = b.airport_id
    JOIN cities AS v ON v.city_id = b.city_id
                        AND v.city_name = 'Budapest'
ORDER BY 
    f.price
FETCH FIRST 1 ROW WITH TIES