Question

这是SQL UPDATE我正在尝试执行：

UPDATE T
  SET T.CurrentStopNumber = TS.CurrentStopNumber 
 FROM Trip T 
INNER JOIN (SELECT TripId, MIN(StopNumber) CurrentStopNumber
             FROM TripStop
            WHERE TripId = '106504'
              AND (IsPickup = 1 OR IsDrop = 1)
              AND StopNumber > (SELECT COALESCE(max(StopNumber), 0) 
                                  FROM TripUpdate 
                                 WHERE TripId = '106504' 
                                   AND Type = 2)) TS ON T.TripId = TS.TripId

我在第二行收到错误：

 /* Error message: SQL script is wrong mismatched input . expecting "EQ" */

我熟悉SQL Server，我确信它可以在SQL Server上运行得很好。子查询运行正常并返回1行，如我所料。我只需要用该值更新表。有什么问题？

Answer 1

使用：

UPDATE TRIP
   SET currentstopnumber = (SELECT MIN(ts.stopnumber)
                              FROM TRIPSTOP ts
                             WHERE ts.tripid = TRIP.tripid
                               AND ts.tripid = '106504'
                               AND 1 IN (ts.ispickup, ts.isdrop)
                               AND ts.stopnumber > (SELECT COALESCE(MAX(tu.stopnumber), 0)
                                                      FROM TRIPUPDATE tu
                                                     WHERE tu.tripid = ts.tripid
                                                       AND tu.type = 2)
                          GROUP BY ts.tripid)
 WHERE EXISTS (SELECT NULL 
                 FROM TRIPSTOP ts
                WHERE ts.tripid = TRIP.tripid
                  AND ts.tripid = '106504'
                  AND 1 IN (ts.ispickup, ts.isdrop)
                  AND ts.stopnumber > (SELECT COALESCE(MAX(tu.stopnumber), 0)
                                         FROM TRIPUPDATE tu
                                        WHERE tu.tripid = ts.tripid
                                          AND tu.type = 2))

最好使用JOIN，但语法不受广泛支持。

Answer 2

我认为你不应该为你设置的字段指定表，因为数据库已经知道要更新哪个表：

SET CurrentStopNumber = TS.CurrentStopNumber

（IIRC，SQL Server中也不允许这样做。）

SQL查询错误 - 我做错了什么？

2 个答案: