[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

 





 















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