MySQL 查询给出错误

Question

我正在尝试获取座位数大于 0 的航类号。我在 MySQL 中有 3 个表

1. Sector
2. Flights
3. Aircraft

请按1,2和3的顺序查看表格结构的图像

我正在写这个SQL

select * from aircraft 
where aircrafttypeID=
       (select aircrafttypeID 
            from sector,flights 
             where source like 'Kolkata' 
             and destination like 'Ahmedabad' 
             and sector.sectorID=flights.sectorID) 
and bseats>0

这个查询给出了错误-

Subquery returns more than 1 row

因为子查询正在重新调整多个航类号。所以我需要一些帮助如何获得座位数大于 0 的航类号

Answer 1

试试这个

SELECT  *
FROM    aircraft
WHERE   aircrafttypeID IN ( SELECT   aircrafttypeID
                            FROM     sector ,
                                     flights
                            WHERE    source LIKE 'Kolkata'
                                     AND destination LIKE 'Ahmedabad'
                                     AND sector.sectorID = flights.sectorID
                     )
    AND bseats > 0