mysql查询问题，每天在两个表中选择总记录

Question

i want to get SUM/Total records each day in a month from two tables,when i run my query on single table,it works but then commulative is not working...like this is for first table which is ok.

select DATE_FORMAT(date(dateadded),'%m/%d/%Y') as dateadded, count(id) as tot_rent
from crm_rentals WHERE YEAR(dateadded) = YEAR(CURRENT_DATE)
AND MONTH(dateadded) = MONTH(CURRENT_DATE)
group by date(dateadded)

this is for second table which is also ok.

select DATE_FORMAT(date(dateadded),'%m/%d/%Y') as dateadded, count(id) as tot_rent
from crm_sales WHERE YEAR(dateadded) = YEAR(CURRENT_DATE)
AND MONTH(dateadded) = MONTH(CURRENT_DATE)
group by date(dateadded)

Issue is when i want to find sum of each day of the result,it is not working properly..here is my final query

select dateadded,count(tot_rent) as tot_rent
from ( select DATE_FORMAT(date(dateadded),'%m/%d/%Y') as dateadded, count(id) as tot_rent
from crm_rentals WHERE YEAR(dateadded) = YEAR(CURRENT_DATE)
AND MONTH(dateadded) = MONTH(CURRENT_DATE)
group by date(dateadded)
union
select DATE_FORMAT(date(dateadded),'%m/%d/%Y') as dateadded, count(id) as tot_rent
from crm_sales WHERE YEAR(dateadded) = YEAR(CURRENT_DATE)
AND MONTH(dateadded) = MONTH(CURRENT_DATE)
group by date(dateadded)) s group by date(dateadded)

table structure for crm_rentals(first table,date=Ymd)

id -----dateadded
15------2013-04-02
16------2013-04-03
17------2013-04-03

table 2 crm_sales

id------dateadded
 7------2013-04-02

Result should be

dateadded-----tot_rent
04/02/2013 ----2
04/03/2013  ---2 //this line is not shown

Answer 1

first query gives

id -----dateadded
1------2013-04-02
2------2013-04-03

second query gives

id -----dateadded
1------2013-04-02

so union will give

1------2013-04-02
2------2013-04-03
1------2013-04-02

its group will do

2------2013-04-02
1------2013-04-03

correct approach would be

15------2013-04-02
16------2013-04-03
17------2013-04-03

UNION

 7------2013-04-02

Then Group will give

2------2013-04-02
2------2013-04-03

try this:

select dateadded,count(tot_rent) as tot_rent
from ( select DATE_FORMAT(date(dateadded),'%m/%d/%Y') as dateadded, id as tot_rent
from crm_rentals WHERE YEAR(dateadded) = YEAR(CURRENT_DATE)
AND MONTH(dateadded) = MONTH(CURRENT_DATE)
union
select DATE_FORMAT(date(dateadded),'%m/%d/%Y') as dateadded, id as tot_rent
from crm_sales WHERE YEAR(dateadded) = YEAR(CURRENT_DATE)
AND MONTH(dateadded) = MONTH(CURRENT_DATE)
) s group by dateadded