Question

我试图根据DRIVERPOSITION计算队友击败队友的次数，但我一直得到invalid select-list in subselect我猜这是因为我使用了子选择查询中的b和a表？

示例数据

RACEID  CONSTRUCTORID  DRIVERID  DRIVERPOSITION
970     4              826       3              
970     4              807       7
960     4              826       4              
960     4              807       7
970     3              820       10              
970     3              810       12
960     3              820       13              
960     3              810       11

期望的结果

RACEID  CONSTRUCTORID  DRIVERID  WINS
970     4              826       2              
970     4              807       0
960     3              820       1              
960     3              810       1

到目前为止我尝试了什么

SELECT 
(
SELECT COUNT(
CASE 
WHEN b.DRIVERPOSITION > a.DRIVERPOSITION THEN 1
ELSE 0 END
)
FROM QUALIFYING b 
WHERE RACEYEAR = to_char(NOW(), 'YYYY')
AND a.CONSTRUCTORID = b.CONSTRUCTORID
AND a.RACEID = b.RACEID
AND a.DRIVERID != b.DRIVERID
)
FROM QUALIFYING a
INNER JOIN RACES 
ON a.RACEID = RACES.RACEID
INNER JOIN DRIVERS
ON a.DRIVERID = DRIVERS.DRIVERID
INNER JOIN CONSTRUCTORS
ON a.CONSTRUCTORID = CONSTRUCTORS.CONSTRUCTORID
WHERE RACEYEAR = to_char(NOW(), 'YYYY');

Answer 1

我认为这可以满足您的需求：

select raceid, constructorid, driverid,
       sum(case when seqnum = 1 then 1 else 0 end) as numwins
from (select d.*,
             row_number() over (partition by raceid, constructorid order by driverposition) as seqnum
      from data d
     ) d
group by raceid, constructorid;

但是，我不知道这如何适合您的查询。您的示例数据引用一个表。您的查询有多个表引用。

SQL使用subselect外部的表子选择查询

1 个答案: