mysql - 如何合并这两个 MySQL 查询

Question

我有 2 个查询，它们几乎完全相同。

查询#1:

SELECT 
    cman_code, cman_name 
FROM
    capder 
JOIN 
    caprange ON capder.cder_rancode = caprange.cran_code 
JOIN 
    capman ON caprange.cran_mantextcode = capman.cman_code 
JOIN 
    capmod ON capder.cder_modcode = capmod.cmod_code 
JOIN 
    nvdtechnical ON nvdtechnical.TECH_Id = capder.cder_ID 
JOIN 
    nvddictionarytechnical ON nvddictionarytechnical.DT_TechCode = nvdtechnical.TECH_TechCode 
JOIN 
    nvddictionarycategory ON nvddictionarycategory.DC_CatCode = nvddictionarytechnical.DT_CatCode 
JOIN 
    nvdmodelyear ON capder.cder_ID = MY_Id
                    AND nvddictionarytechnical.DT_TechCode = 67 
                    AND nvdtechnical.TECH_Value_Float < '100' 
                    AND nvdtechnical.TECH_Value_Float != 0      
                    AND cder_transmission = 'M' 
                    AND cman_code IN ('1','140','164','836','869','1283','1333','1925','2193','2514','4256','4537','4721','4835','5088','5171','5182','5238','5261','5509','6058','6425','7104','7983','8083','8219','9909','10172','10251','10383','10519','10968','12243','12764','14786','15155','21223','22439','44394','47841') 
                    AND (cmod_discontinued=0 OR cmod_discontinued=2015) 
                    AND cder_discontinued = '0000-00-00 00:00:00' 
GROUP BY 
    cman_code 
ORDER BY 
    cman_name DESC

查询#2:

SELECT 
    cman_code, cman_name 
FROM 
    capder 
JOIN 
    caprange ON capder.cder_rancode = caprange.cran_code 
JOIN 
    capman ON caprange.cran_mantextcode = capman.cman_code 
JOIN 
    capmod ON capder.cder_modcode = capmod.cmod_code 
JOIN 
    nvdtechnical ON nvdtechnical.TECH_Id = capder.cder_ID 
JOIN 
    nvddictionarytechnical ON nvddictionarytechnical.DT_TechCode = nvdtechnical.TECH_TechCode 
JOIN 
    nvddictionarycategory ON nvddictionarycategory.DC_CatCode = nvddictionarytechnical.DT_CatCode 
JOIN 
    nvdmodelyear ON capder.cder_ID = MY_Id
WHERE 
    nvddictionarytechnical.DT_TechCode = 11 
    AND nvdtechnical.TECH_Value_Float < 25  
    AND nvdtechnical.TECH_Value_Float != 0
    AND cder_transmission = 'M' 
    AND cman_code IN ('1','140','164','836','869','1283','1333','1925','2193','2514','4256','4537','4721','4835','5088','5171','5182','5238','5261','5509','6058','6425','7104','7983','8083','8219','9909','10172','10251','10383','10519','10968','12243','12764','14786','15155','21223','22439','44394','47841') 
    AND (cmod_discontinued=0 OR cmod_discontinued=2015) 
    AND cder_discontinued = '0000-00-00 00:00:00' 
GROUP BY 
    cman_code 
ORDER BY 
    cman_name DESC

这两个查询都能完美运行并产生我想要的准确结果。

两者之间的唯一区别是 nvddictionarytechnical.**DT_TechCode** 和 nvdtechnical.**TECH_Value_Float**

我无法将它们组合在一起。

TECH_Value_Float - 列包含CO2 和MPG 值。

我只需要将它们合并到 1 个查询中。

使用这个不起作用:

where 
(
   (
     nvddictionarytechnical.DT_TechCode = 67 
     AND nvdtechnical.TECH_Value_Float < '100'
   ) 
   or 
   (
     nvddictionarytechnical.DT_TechCode = 11 
     AND nvdtechnical.TECH_Value_Float < 25
   )
 ) 

where 和 or 产生如下结果:

|CO2 | MPG|
-----------
 94  | 78 |
 378 | 19 |

我需要 MPG 和 CO2 都为真。结果如下:

|CO2 | MPG|
-----------
 15  | 18 |
 10  | 17 |

专业人士有什么建议吗？我应该只查询 2 个吗？有没有人遇到过这样的问题？这很不寻常吗？

感谢您的帮助。

Answer 1

你试过吗:

where 
(
   (
     nvddictionarytechnical.DT_TechCode = 67 
     AND nvdtechnical.TECH_Value_Float < '100'
   ) 
   or 
   (
     nvddictionarytechnical.DT_TechCode = 11 
     AND nvdtechnical.TECH_Value_Float < 25
   )
 )