CreateQuery上的EntitySqlException和类型不匹配

Question

我有这种情况。我使用此查询调用CreateQuery，我得到了Exception。

string sql = "SELECT VALUE CP 
                FROM CIC_PRODUZIONE_OPERAZIONI_View AS CP 
                WHERE  CP.CD_PLANT = 5 
                   AND CP.CD_POSTI = 10946 
                   AND (CP.FL_STATE IN {N'D',N'N',N'M'}) 
                   AND EXISTS (SELECT 1 
                               FROM CIC_OPERAZIONI AS C 
                               WHERE CP.CD_CIC_PRODUZIONE = C.CD_CIC_PRODUZIONE 
                                  AND C.CD_POSTI = 10894 
                                  AND C.AFCDOPER = (SELECT VALUE TOP (1) D.AFCDOPER                                                                     FROM CIC_OPERAZIONI AS D
    WHERE D.CD_CIC_PRODUZIONE = CP.CD_CIC_PRODUZIONE 
      AND D.AFCDOPER > CP.AFCDOPER 
    ORDER BY D.AFCDOPER)) 
    ORDER BY CP.AFCDPROD, CP.FL_STATE, CP.AFESPSAP, CP.AFESPMOD, CP.AFCDOPER";

    ObjectQuery<T> entities = CreateQuery<T>(sql);

这是例外：

  

EntitySqlException：参数类型'Edm.Decimal'和   'Transient.collection [Edm.Decimal（可空=真，默认值=精密= 4，刻度= 0）]'   与此操作不兼容。

问题似乎是当我尝试选择TOP值时。

有什么建议吗？

修改

我不认为问题出现在表达式的右侧，因为子查询得到ICollection<decimal>，而左边有一个十进制字段。

...

C.AFCDOPER = (SELECT VALUE TOP (1) D.AFCDOPER                                                                     FROM CIC_OPERAZIONI AS D
        WHERE D.CD_CIC_PRODUZIONE = CP.CD_CIC_PRODUZIONE 
          AND D.AFCDOPER > CP.AFCDOPER

...

怎么可能获得该集合的“第一”以避免异常？

Answer 1

你试过吗？

Select Top(1) D.AFCDOPER   FROM CIC_OPERAZIONI AS D

我认为这将在没有世界“价值”的情况下发挥作用。