mysql – 日期范围问题

2019年8月4日 148次阅读

我需要检查在过去“x”天(例如30天)中创建的条目,并且无法使查询生效.这就是我正在使用的：

  SELECT   CAL_OWNER,
           CAL_TITLE,
           FROM_UNIXTIME (CAL_CREATED, "%m-%d-%y") AS CREATED,
           FROM_UNIXTIME (RANGE_START, "%Y-%m-%d") AS DATE2BESEEN,
           CASE CAL_REFERRAL_TYPE
              WHEN 1 THEN 'NoReferral'
              WHEN 2 THEN 'CareyGuide'
              WHEN 3 THEN 'Education'
              WHEN 4 THEN 'Employment'
              WHEN 5 THEN 'Housing'
              WHEN 6 THEN 'Medical'
              ELSE 'NA'
           END
              AS REFERRALS
    FROM   EGW_CAL
   WHERE   CAL_CREATED BETWEEN (NOW () - '30 day') AND NOW ()
ORDER BY   REFERRALS ASC;

如果我注释掉“WHERE range_start …”行,则查询运行正常,但会提取所有数据
但是,如果我运行完整的查询,它不会出错,但是没有结果(我在过去3周内的列cal_created中有4个条目).

如果有人可以提供帮助,我会非常感激

最佳答案 尝试使用INTERVAL和NOW()或CURDATE()..

WHERE FROM_UNIXTIME (CAL_CREATED,'%Y-%m-%d') BETWEEN CURDATE() - INTERVAL 30 DAY AND CURDATE()

curdate只是当天的日期部分

如果你想包括时间使用NOW()

WHERE FROM_UNIXTIME (CAL_CREATED,'%Y-%m-%d') BETWEEN NOW() - INTERVAL 30 DAY AND NOW()

你也可以用一个新的日期来使用

WHERE FROM_UNIXTIME (CAL_CREATED,'%Y-%m-%d') BETWEEN DATE_SUB(NOW(), INTERVAL 30 DAY) AND NOW()

消息来源：http://dev.mysql.com/doc/refman/5.1/en/date-and-time-functions.html

注意：日期需要正确格式化才能生效

完整查询：

SELECT  
    CAL_OWNER,
    CAL_TITLE,
    FROM_UNIXTIME (CAL_CREATED, '%m-%d-%y') AS CREATED_AT,
    FROM_UNIXTIME (RANGE_START, '%Y-%m-%d') AS DATE2BESEEN,
    CASE CAL_REFERRAL_TYPE
        WHEN 1 THEN 'NoReferral'
        WHEN 2 THEN 'CareyGuide'
        WHEN 3 THEN 'Education'
        WHEN 4 THEN 'Employment'
        WHEN 5 THEN 'Housing'
        WHEN 6 THEN 'Medical'
        ELSE 'NA'
    END AS REFERRALS
FROM  EGW_CAL
WHERE FROM_UNIXTIME(CAL_CREATED,'%Y-%m-%d') BETWEEN (NOW() - INTERVAL 30 DAY) AND NOW()
ORDER BY REFERRALS ASC;
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