或其他条件之间的冲突

Question

我有以下查询:

    SELECT * FROM `Contacts` 
WHERE `Zona` = '1' 
AND `Responsable` = '9' 
AND `AllowComercialVisit` = 'Call_Again'
-- the problem are OR's --
OR `AllowComercialVisit` = 'Busy' 
OR `AllowComercialVisit` = 'Not_answered' 
-- the problem are OR's --
AND `DateRecall` <= '2016-06-20 13:04:52' 
AND `DateRecall` >= '2016-06-20 12:39:52' 
ORDER BY `DateRecall` ASC LIMIT 1

问题是查询应该只显示第一个和第二个'DateRecall'之间的行,但是返回所有带有'Call_Again','Busy'和'Not_answered'的行而不过滤日期.

任何解决方案将不胜感激!

Answer 1

一个简单的IN()解决方案:

SELECT * FROM `Contacts` 
WHERE `Zona` = '1' 
    AND `Responsable` = '9' 
    AND `AllowComercialVisit` IN ('Call_Again','Busy','Not_answered') 
    AND `DateRecall` BETWEEN '2016-06-20 12:39:52'
                         AND '2016-06-20 13:04:52' 
ORDER BY `DateRecall` ASC
LIMIT 1

一般情况下,使用圆括号时使用AND优先级- >OROR

WHERE COND1 AND COND2 AND (COND3 OR COND4) AND COND5

这将强制优化器遵循您的优先级而不是默认优先级.

Answer 2

请尝试以下查询:

SELECT * FROM `Contacts` 
WHERE `Zona` = '1' 
AND `Responsable` = '9' 
AND (`AllowComercialVisit` = 'Call_Again' OR `AllowComercialVisit` = 'Busy' OR AllowComercialVisit` = 'Not_answered')
AND `DateRecall` <= '2016-06-20 13:04:52' 
AND `DateRecall` >= '2016-06-20 12:39:52' 
ORDER BY `DateRecall` ASC 
LIMIT 1

用括号括起OR.

Answer 3

尝试将OR语句分组,因为它们与同一列相关,即

SELECT * FROM `Contacts` 
WHERE `Zona` = '1' 
AND `Responsable` = '9' 
AND (`AllowComercialVisit` = 'Call_Again' 
OR `AllowComercialVisit` = 'Busy' 
OR `AllowComercialVisit` = 'Not_answered' ) 
AND `DateRecall` <= '2016-06-20 13:04:52' 
AND `DateRecall` >= '2016-06-20 12:39:52' 
ORDER BY `DateRecall` ASC LIMIT 1