CreateQuery 上的 EntitySqlException 和类型不匹配

Question

我有这种情况。我用这个查询调用CreateQuery，我得到了异常。

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(Nullable=True,DefaultValue=,Precision=4,Scale=0)]' 与此操作不兼容。

问题似乎出在我尝试选择 TOP 值时。

有什么建议吗？

编辑

我不明白问题出在表达式的右侧，因为子查询得到一个ICollection<decimal>，而在左侧我有一个小数字段。

...

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

...

如何获得该集合的“第一个”以避免出现异常？

Answer 1

你试过了吗？

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

我认为这将在没有世界“VALUE”的情况下工作。