2011年12月23日 星期五

[MySQL]求月初及求月底,使用 DAYOFWEEK (), DATE_ADD (), LAST_DAY( ),CURDATE(),WEEKDAY(),DATE_SUB(),MONTH(),DAY()

[MySQL]求月初及求月底,使用 DAYOFWEEK (), DATE_ADD (),
LAST_DAY( ),CURDATE(),WEEKDAY(),DATE_SUB(),MONTH(),DAY()


SELECT
DATE_FORMAT(CURDATE() ,'%Y/%m/01') ,    #月初
LAST_DAY(CURDATE()) #月底

※※※※※※※※※※求年初第一個禮拜一※※※※※※※※※※※
SELECT
         IF(DAYOFWEEK(getDate.firstDate) =2,
                  getDate.firstDate,
                  DATE_ADD(getDate.firstDate, INTERVAL 7-WEEKDAY(getDate.firstDate) DAY)
         ) AS firstMonday
FROM
         (SELECT
                  DATE_SUB(
                           DATE_SUB(
                                    mydate.todate,
                                    INTERVAL MONTH(mydate.todate)-1 MONTH),
                           INTERVAL DAY(mydate.todate)-1 DAY
         ) AS firstDate
         FROM
                  (SELECT IFNULL(?, CURDATE()) AS todate) AS mydate
         )AS getDate

[MYSQL ]求月初及求月底,使用DAYOFWEEK( ) , DATE_ADD () , LAST_DAY( ), CURDATE () , WEEKDAY( ) , DATE_SUB () , MONTH() , DAY( )
















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