Add dates of one whole month in mysql database - mysql

Question

Can Any one please tell me how to add one whole month date's in mysql database. For now I'm adding one date at a time.

Answer 1

This query generates all the days of a given month.
I found this in this post.
When you change NOW() function with any date you want, it generates the dates of that month. You can also join this with your queries or you can use it with INSERT [(col_name,...)] SELECT ... statement to insert all the dates to a table.
SELECT date_field
FROM
(
SELECT
MAKEDATE(YEAR(NOW()),1) +
INTERVAL (MONTH(NOW())-1) MONTH +
INTERVAL daynum DAY date_field
FROM
(
SELECT t*10+u daynum
FROM
(SELECT 0 t UNION SELECT 1 UNION SELECT 2 UNION SELECT 3) A,
(SELECT 0 u UNION SELECT 1 UNION SELECT 2 UNION SELECT 3
UNION SELECT 4 UNION SELECT 5 UNION SELECT 6 UNION SELECT 7
UNION SELECT 8 UNION SELECT 9) B
ORDER BY daynum
) AA
) AAA
WHERE MONTH(date_field) = MONTH(NOW());

Answer 2

plan
build up decimal numbers with cross join on digits - all numbers can be expressed as :
an10^n + .. a0*10^0
use date_add to add start of month data filtering where less than next month start
setup
create table example
(
`date` date primary key not null
);
drop view if exists digits_v;
create view digits_v
as
select 0 as n
union all
select 1 union all select 2 union all select 3 union all
select 4 union all select 5 union all select 6 union all
select 7 union all select 8 union all select 9
;
query
insert into example ( `date` )
select date_add(date('2015-11-01'), interval a2.n * 100 + a1.n * 10 + a0.n day)
from digits_v a2
cross join digits_v a1
cross join digits_v a0
where date_add(date('2015-11-01'), interval a2.n * 100 + a1.n * 10 + a0.n day)
< date('2015-12-01')
;
sqlfiddle
selecting the top 10 gives
select `date`
from example
order by `date`
limit 10
;
.
+----------------------------+
| date |
+----------------------------+
| November, 01 2015 00:00:00 |
| November, 02 2015 00:00:00 |
| November, 03 2015 00:00:00 |
| November, 04 2015 00:00:00 |
| November, 05 2015 00:00:00 |
| November, 06 2015 00:00:00 |
| November, 07 2015 00:00:00 |
| November, 08 2015 00:00:00 |
| November, 09 2015 00:00:00 |
| November, 10 2015 00:00:00 |
+----------------------------+