Sql表自连接，数据库中查询没问题，Hibernate中查询有问题？

   原先的SQL：        

SELECT md.repertory,

       md.mid,

       md.status,

       m.pic,

       m.name,

       m.selling_price,

       m.vendor,

       mp.property_value,

       mp2.property_value AS gyzz,    这两个在数据库中查询时不一致，，但在Hibernate中查询出来结果一样

       md.did,

       md.id,

       (CASE md.retail_price

          WHEN NULL THEN 0.00

          ELSE md.retail_price

        END) AS retail_price

FROM   yk_medicine_drugstore md

       INNER JOIN yk_medicine m

         ON m.id = md.mid

       INNER JOIN yk_medicine_property_detail mp

         ON mp.medicine_id = md.mid

            AND mp.property_id = 6

       INNER JOIN yk_medicine_property_detail mp2

         ON mp2.medicine_id = md.mid

            AND mp2.property_id = 17

WHERE  md.did = 19
  

修改后的SQL：

sql="select md.repertory,md.mID,md.status," +

                "m.pic,m.name,m.selling_price,m.vendor,mp.property_value," +

                "concat('[',mp2.property_value)as gyzz,md.dID,md.id ," +

                "cast(retail_price as decimal(8,2))" +

                " from yk_medicine_drugstore md " +

                "inner join yk_medicine m on m.id=md.mID " +

                "inner join yk_medicine_property_detail mp " +

                "on mp.medicine_id=md.mID and mp.property_id=6 " +

                "inner join yk_medicine_property_detail mp2 " +

                "on mp2.medicine_id=md.mID and mp2.property_id=17 "

                +"where md.dID=19";