Mysql SQL对WHERE comparator的多个查询

我正在尝试编写一个MySQL查询，它将根据从查询到表1的结果从表2中选择结果。大概是这样的：

SELECT route_id FROM trips WHERE trip_id = 
SELECT trip_id  FROM stop_times WHERE 
stop_id=<ID GOES HERE> LIMIT 1

SELECT t.route_id
FROM trips t
WHERE t.trip_id = (SELECT st.trip_id
                   FROM stop_times st
                   WHERE st.stop_id = <ID GOES HERE>
                   LIMIT 1
                  );

---

您的子查询应该是：

SELECT route_id 
FROM trips 
WHERE trips.trip_id =
( 
    SELECT stop_times.trip_id  
    FROM stop_times 
    WHERE stop_id = <ID GOES HERE> 
    LIMIT 1
) 

有两种选择：

SELECT route_id FROM trips WHERE trip_id in (SELECT trip_id  FROM stop_times WHERE stop_id=<ID GOES HERE> LIMIT 1)

或者更简单：

select t.route_id from trips t, stop_times s where t.trip_id = s.trip_id and s.stop_id= <ID GOES HERE> LIMIT 1

---

您的原始查询应该这样编写：

SELECT route_id FROM trips WHERE trip_id = 
SELECT trip_id  FROM stop_times WHERE 
stop_id=<ID GOES HERE> LIMIT 1

SELECT t.route_id
FROM trips t
WHERE t.trip_id = (SELECT st.trip_id
                   FROM stop_times st
                   WHERE st.stop_id = <ID GOES HERE>
                   LIMIT 1
                  );

我认为这更通常地写为：

SELECT t.route_id
FROM stop_times st JOIN
     trips t
     ON t.trip_id = st.trip_id
WHERE st.stop_id = <ID GOES HERE>
LIMIT 1;

---

这假设您希望返回一行。

将内部选择放在括号内，请将其格式设置得更好，以便我们更容易阅读。示例数据和所需结果将有所帮助。