我的结果是以我想要的方式返回--我只想忽略MPG_VALUE > 30 (nvdtechnical.TECH_Value_Float)的行
但是,我的查询返回MPG_VALUE列中的所有行和不需要的行都为空。
如何只返回MPG_VALUE > 30的行?
SELECT *, (SELECT PR_Basic + PR_VAT + PR_Delivery FROM nvdprices
WHERE PR_Id = capder.cder_ID ORDER BY PR_EffectiveTo ASC LIMIT 1) as P11D,
(SELECT nvdtechnical.TECH_Value_Float FROM nvdtechnical
WHERE TECH_TechCode = '11'
AND nvdtechnical.TECH_Id = capder.cder_ID
AND nvdtechnical.TECH_Value_Float > 30
LIMIT 1) as MPG_VALUE
from capmod
JOIN capder ON capder.cder_modcode = capmod.cmod_code
JOIN caprange ON capder.cder_rancode = caprange.cran_code
JOIN capman ON caprange.cran_mantextcode = capman.cman_code
JOIN nvdmodelyear ON capder.cder_ID = MY_Id
AND nvdmodelyear.MY_EffectiveTo = '0000-00-00 00:00:00'
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
AND nvddictionarycategory.DC_CatCode=4
AND nvddictionarytechnical.DT_TechCode = 67
AND nvdtechnical.TECH_Value_Float >= '255'
JOIN capfueltype ON capfueltype.cft_code = capder.cder_fueltype
JOIN nvdbodystyle ON capmod.cmod_bodystyle = nvdbodystyle.bs_code
WHERE caprange.cran_mantextcode='140'
AND caprange.cran_code='522'
AND capder.cder_fueltype='P'
AND capder.cder_transmission='A'
AND nvdbodystyle.bs_code='3'
AND (cmod_discontinued=0 OR cmod_discontinued=2015)
AND capman.cman_code IN ('1','140','164')
AND caprange.cran_code IN ('924','126','147','955','965','661')
ORDER BY P11D, capman.cman_name ASC, caprange.cran_name, capmod.cmod_name 发布于 2015-03-29 04:51:43
这是因为您正在对MPG值执行标量查询。实际上,您并不是在筛选要显示或隐藏的行,而是显示与主查询匹配的所有行。
想象一下左联接,这就像你正在做的事情。
SELECT nvdtechnical.TECH_Value_Float FROM nvdtechnical
WHERE TECH_TechCode = '11'
AND nvdtechnical.TECH_Id = capder.cder_ID
**AND nvdtechnical.TECH_Value_Float > 30**
LIMIT 1若要正确筛选数据,必须在where条件下再次过滤外部数据:
最简单的方法就是这样。
SELECT *
FROM (
SELECT *, (SELECT PR_Basic + PR_VAT + PR_Delivery FROM nvdprices
WHERE PR_Id = capder.cder_ID ORDER BY PR_EffectiveTo ASC LIMIT 1) as P11D,
(SELECT nvdtechnical.TECH_Value_Float FROM nvdtechnical
WHERE TECH_TechCode = '11'
AND nvdtechnical.TECH_Id = capder.cder_ID
AND nvdtechnical.TECH_Value_Float > 30
LIMIT 1) as **MPG_VALUE**
from capmod
JOIN capder ON capder.cder_modcode = capmod.cmod_code
JOIN caprange ON capder.cder_rancode = caprange.cran_code
JOIN capman ON caprange.cran_mantextcode = capman.cman_code
JOIN nvdmodelyear ON capder.cder_ID = MY_Id
AND nvdmodelyear.MY_EffectiveTo = '0000-00-00 00:00:00'
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
AND nvddictionarycategory.DC_CatCode=4
AND nvddictionarytechnical.DT_TechCode = 67
AND nvdtechnical.TECH_Value_Float >= '255'
JOIN capfueltype ON capfueltype.cft_code = capder.cder_fueltype
JOIN nvdbodystyle ON capmod.cmod_bodystyle = nvdbodystyle.bs_code
WHERE caprange.cran_mantextcode='140'
AND caprange.cran_code='522'
AND capder.cder_fueltype='P'
AND capder.cder_transmission='A'
AND nvdbodystyle.bs_code='3'
AND (cmod_discontinued=0 OR cmod_discontinued=2015)
AND capman.cman_code IN ('1','140','164')
AND caprange.cran_code IN ('924','126','147','955','965','661')
ORDER BY P11D, capman.cman_name ASC, caprange.cran_name, capmod.cmod_name
) x
WHERE x.MPG_VALUE IS NOT NULL;注意,外部过滤的x.MPG_VALUE是标量查询。
编辑:您可以尝试其他方法,如,内部连接。
SELECT *, (SELECT PR_Basic + PR_VAT + PR_Delivery FROM nvdprices
WHERE PR_Id = capder.cder_ID ORDER BY PR_EffectiveTo ASC LIMIT 1) as P11D,
MPG_VALUE.TECH_Id
from capmod
JOIN capder ON capder.cder_modcode = capmod.cmod_code
JOIN caprange ON capder.cder_rancode = caprange.cran_code
JOIN capman ON caprange.cran_mantextcode = capman.cman_code
JOIN nvdmodelyear ON capder.cder_ID = MY_Id
AND nvdmodelyear.MY_EffectiveTo = '0000-00-00 00:00:00'
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
AND nvddictionarycategory.DC_CatCode=4
AND nvddictionarytechnical.DT_TechCode = 67
AND nvdtechnical.TECH_Value_Float >= '255'
JOIN capfueltype ON capfueltype.cft_code = capder.cder_fueltype
JOIN nvdbodystyle ON capmod.cmod_bodystyle = nvdbodystyle.bs_code
INNER JOIN
(
SELECT TECH_Value_Float,TECH_Id
FROM nvdtechnical
WHERE TECH_TechCode = '11'
AND TECH_Value_Float > 30
) MPG_VALUE
ON MPG_VALUE.TECH_Id = capder.cder_ID
WHERE caprange.cran_mantextcode='140'
AND caprange.cran_code='522'
AND capder.cder_fueltype='P'
AND capder.cder_transmission='A'
AND nvdbodystyle.bs_code='3'
AND (cmod_discontinued=0 OR cmod_discontinued=2015)
AND capman.cman_code IN ('1','140','164')
AND caprange.cran_code IN ('924','126','147','955','965','661')
ORDER BY P11D, capman.cman_name ASC, caprange.cran_name, capmod.cmod_name;https://stackoverflow.com/questions/29325608
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