MySQL Query for calculating the days between 2dates group by months - mysql

Question

I have 2days like check_in(25/04/2011), and a check_out(04/06/2011). Now I need to calculate the days between the dates in month wise.
ie. Month - Days,
April - 5,
May - 31,
June - 4,
Please help me in building as mysql query for getting the above result.
Thanks in advance.

Answer 1

If you want strictly done in MySQL, you need to create a Stored Procedure to do this.
Something like this in line of Stored Procedure (and range is not higher than a year).
DROP PROCEDURE IF EXISTS `getDateDiffBreakdown`;
CREATE PROCEDURE `getDateDiffBreakdown`(_DATE1 DATE,_DATE2 DATE)
BEGIN
IF (MONTH(_DATE1)<>MONTH(_DATE2)) THEN
-- we detected a month change
-- compute the selection based on current date and last day of month
SELECT CONCAT(DATE_FORMAT(_DATE1,'%M'),' - ',TO_DAYS(LAST_DAY(_DATE1))-TO_DAYS(_DATE1)+1);
-- step into next month and re-run the calc
call getDateDiffBreakdown(DATE_ADD(LAST_DAY(_DATE1),INTERVAL 1 DAY),_DATE2);
ELSE
-- same month, do the calculation
SELECT CONCAT(DATE_FORMAT(_DATE1,'%M'),' - ',TO_DAYS(_DATE2)-TO_DAYS(_DATE1)+1);
END IF;
END;
call like this:
set max_sp_recursion_depth = 11;
call getDateDiffBreakdown('2011-12-11','2012-06-03');
UPDATE
In another approach to get in 1 line, it would be:
DROP PROCEDURE IF EXISTS `getDateDiffBreakdown2`;
CREATE PROCEDURE `getDateDiffBreakdown2`(IN _DATE1 DATE,IN _DATE2 DATE, INOUT _RETURN VARCHAR(1000))
BEGIN
IF (MONTH(_DATE1)<>MONTH(_DATE2)) THEN
-- we detected a month change
-- compute the selection based on current date and last day of month
SET _RETURN=CONCAT(_RETURN,DATE_FORMAT(_DATE1,'%M'),' - ',TO_DAYS(LAST_DAY(_DATE1))-TO_DAYS(_DATE1)+1);
SET _RETURN = CONCAT(_RETURN,",");
-- step into next month and re-run the calc
call getDateDiffBreakdown2(DATE_ADD(LAST_DAY(_DATE1),INTERVAL 1 DAY),_DATE2,_RETURN);
ELSE
-- same month, do the calculation
SET _RETURN=CONCAT(_RETURN,DATE_FORMAT(_DATE1,'%M'),' - ',TO_DAYS(_DATE2)-TO_DAYS(_DATE1)+1);
END IF;
END;
call like this:
set max_sp_recursion_depth = 255;
set #TEMP = '';
call getDateDiffBreakdown2('2011-12-11','2012-06-03',#TEMP);
SELECT #TEMP;

Answer 2

I was trying to solve the problem too.
Pentium10 is too strong and now I'll try his solution. :)
By the way this is mine.
delimiter //
drop procedure if exists groupDaysByMonth//
create procedure groupDaysByMonth(in dStart date,in dEnd date)
begin
declare i int default 0;
declare months,days int;
drop table if exists t;
create temporary table t (
month_year varchar(50),
daysNum int
);
set months = (select period_diff(date_format(dEnd,'%Y%m'),date_format(dStart,'%Y%m')));
while i<=months do
if months = 0 then
set days = (select datediff(dEnd,dStart));
elseif i = 0 then
set days = ( select datediff(concat(date_format(dStart,'%Y-%m-'),day(last_day(dStart))),dStart));
elseif months = i then
set days = (select datediff(dEnd,date_format(dEnd,'%Y-%m-01'))+1);
else
set days = ( select day(last_day(dStart + interval i month)));
end if;
insert into t (month_year,daysNum) values(date_format(dStart + interval i month,'%M %Y'),days);
set i = i + 1;
end while;
select * from t;
end //
delimiter ;
mysql> call groupDaysByMonth('2011-04-25','2011-04-30');
+------------+---------+
| month_year | daysNum |
+------------+---------+
| April 2011 | 5 |
+------------+---------+
1 row in set (0.01 sec)
mysql> call groupDaysByMonth('2011-04-25','2011-06-04');
+------------+---------+
| month_year | daysNum |
+------------+---------+
| April 2011 | 5 |
| May 2011 | 31 |
| June 2011 | 4 |
+------------+---------+
3 rows in set (0.01 sec)
Query OK, 0 rows affected (0.01 sec)
mysql> call groupDaysByMonth('2011-09-25','2012-05-02');
+----------------+---------+
| month_year | daysNum |
+----------------+---------+
| September 2011 | 5 |
| October 2011 | 31 |
| November 2011 | 30 |
| December 2011 | 31 |
| January 2012 | 31 |
| February 2012 | 29 |
| March 2012 | 31 |
| April 2012 | 30 |
| May 2012 | 2 |
+----------------+---------+
9 rows in set (0.01 sec)
Query OK, 0 rows affected (0.03 sec)
Hope that it helps.

Answer 3

Follow Answer 1 -- i am using it for multi year n the result set is month number with year and then the days of month format is "month number - last two digit of year - total days in month."
you can change the format of display according your need
**UPDATE**
In another approach to get in 1 line, it would be:
DROP PROCEDURE IF EXISTS `getDateDiffBreakdown2`;
CREATE PROCEDURE `getDateDiffBreakdown2`(IN _DATE1 DATE,IN _DATE2 DATE, INOUT _RETURN VARCHAR(1000))
BEGIN
IF (MONTH(_DATE1)<>MONTH(_DATE2)) THEN
-- we detected a month change
-- compute the selection based on current date and last day of month
SET _RETURN=CONCAT(_RETURN,DATE_FORMAT(_DATE1,'%M'),' - ',TO_DAYS(LAST_DAY(_DATE1))-TO_DAYS(_DATE1)+1);
SET _RETURN = CONCAT(_RETURN,",");
-- step into next month and re-run the calc
call getDateDiffBreakdown2(DATE_ADD(LAST_DAY(_DATE1),INTERVAL 1 DAY),_DATE2,_RETURN);
ELSE
-- same month, do the calculation
SET _RETURN=CONCAT(_RETURN,DATE_FORMAT(_DATE1,'%M'),' - ',TO_DAYS(_DATE2)-TO_DAYS(_DATE1)+1);
END IF;
END;
call like this:
set max_sp_recursion_depth = 255;
set #TEMP = '';
call getDateDiffBreakdown2('2011-12-11','2012-06-03',#TEMP);
SELECT #TEMP;
I have applied this post in one of my requirement but i found it buggy. i can be wrong if any one prove it and provide a better solution.
look how i am calling it and what i am getting :
set max_sp_recursion_depth = 255;
set #TEMP = '';
call getDateDiffBreakdown2('2010-12-10' , '2011-12-10',#TEMP);
SELECT #TEMP;
in result i get : '12 - 10 - 366'
year is changed but month is same.
i have tweaked the function as following: kindly let me know if some thing is strange. thanks
DROP PROCEDURE IF EXISTS `getDateDiffBreakdown2`;
CREATE PROCEDURE `getDateDiffBreakdown2`(IN _DATE1 DATE,IN _DATE2 DATE, INOUT _RETURN VARCHAR(1000))
BEGIN
IF(YEAR(_DATE1)<>YEAR(_DATE2)) THEN
SET _RETURN=CONCAT(_RETURN,DATE_FORMAT(_DATE1,'%b - %y'),' - ',TO_DAYS(LAST_DAY(_DATE1))-TO_DAYS(_DATE1)+1);
SET _RETURN = CONCAT(_RETURN,",");
-- step into next month and re-run the calc
call getDateDiffBreakdown2(DATE_ADD(LAST_DAY(_DATE1),INTERVAL 1 DAY),_DATE2,_RETURN);
ELSEIF (MONTH(_DATE1)<>MONTH(_DATE2)) THEN
-- we detected a month change
-- compute the selection based on current date and last day of month
SET _RETURN=CONCAT(_RETURN,DATE_FORMAT(_DATE1,'%M'),' - ',TO_DAYS(LAST_DAY(_DATE1))-TO_DAYS(_DATE1)+1);
SET _RETURN = CONCAT(_RETURN,",");
-- step into next month and re-run the calc
call getDateDiffBreakdown2(DATE_ADD(LAST_DAY(_DATE1),INTERVAL 1 DAY),_DATE2,_RETURN);
ELSE
-- same month, do the calculation
SET _RETURN=CONCAT(_RETURN,DATE_FORMAT(_DATE1,'%M'),' - ',TO_DAYS(_DATE2)-TO_DAYS(_DATE1)+1);
END IF;
END;

Answer 4

Use TO_DAYS(date) function for that.