MYSQL生成日历表，通常在做报表的时候需要用来生成一个临时表，用来左连接等。

最近在做一个报表，数据库是用MYSQL，于是需要个日历表，

通常在做报表的时候会经常使用到。

CREATE DEFINER = 'root'@'localhost' PROCEDURE `create_tmp_yearmonth_tb`()

    NOT DETERMINISTIC

    CONTAINS SQL

    SQL SECURITY DEFINER

    COMMENT ''

BEGIN

  #变量声明    

  declare sourcedate date;

  declare targetdate date;

  declare indexdate date;

  declare index_month int;

  declare step_year_month char(20);

  

  set sourcedate = date('2010-01-01');

  set targetdate = date('2010-05-01');

  set indexdate = sourcedate;

    

  set index_month = month(indexdate);

    #执行循环

   while indexdate <= targetdate do  

          begin

             set index_month = month(indexdate);

             set step_year_month =  concat(cast(year(indexdate) as char) ,'-',cast(index_month as char),'-01');

             insert tmp_ym_tb(ym) values(step_year_month); 

             set step_year_month =  concat(cast(year(indexdate) as char) ,'-',cast((index_month+1) as char),'-01');

             set indexdate = date(step_year_month);

        end;

   end while;





END;