generate days from date range

Question

I would like to run a query like

select ... as days where `date` is between \'2010-01-20\' and \'2010-01-24\'

And return data like:

Answer 1

try this.

SELECT TO_DATE('20160210','yyyymmdd') - 1 + LEVEL AS start_day 
from DUAL
connect by level <= (TO_DATE('20160228','yyyymmdd') + 1) - TO_DATE('20160210','yyyymmdd') ;

Answer 2

if you will ever need more then a couple days, you need a table.

Create a date range in mysql

then,

select from days.day, count(mytable.field) as fields from days left join mytable on day=date where date between x and y;

Answer 3

MSSQL Query

select datetable.Date 
from (
    select DATEADD(day,-(a.a + (10 * b.a) + (100 * c.a)),getdate()) AS Date
    from (select 0 as a 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) as a

    cross join (select 0 as a 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) as b

    cross join (select 0 as a 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) as c
) datetable
where datetable.Date between '2014-01-20' and '2014-01-24' 
order by datetable.Date DESC

Output

Date
-----
2014-01-23 12:35:25.250
2014-01-22 12:35:25.250
2014-01-21 12:35:25.250
2014-01-20 12:35:25.250

Answer 4

For Access 2010 - multiple steps required; I followed the same pattern as posted above, but thought I could help someone in Access. Worked great for me, I didn't have to keep a seeded table of dates.

Create a table called DUAL (similar to how the Oracle DUAL table works)

• ID (AutoNumber)
• DummyColumn (Text)
• Add one row values (1,"DummyRow")

Create a query named "ZeroThru9Q"; manually enter the following syntax:

SELECT 0 AS a
FROM dual
UNION ALL
SELECT 1
FROM dual
UNION ALL
SELECT 2
FROM dual
UNION ALL
SELECT 3
FROM dual
UNION ALL
SELECT 4
FROM dual
UNION ALL
SELECT 5
FROM dual
UNION ALL
SELECT 6
FROM dual
UNION ALL
SELECT 7
FROM dual
UNION ALL
SELECT 8
FROM dual
UNION ALL
SELECT 9
FROM dual;

Create a query named "TodayMinus1KQ" (for dates before today); manually enter the following syntax:

SELECT date() - (a.a + (10 * b.a) + (100 * c.a)) AS MyDate
FROM
  (SELECT *
   FROM ZeroThru9Q) AS a,

  (SELECT *
   FROM ZeroThru9Q) AS b,

  (SELECT *
   FROM ZeroThru9Q) AS c

Create a query named "TodayPlus1KQ" (for dates after today); manually enter the following syntax:

SELECT date() + (a.a + (10 * b.a) + (100 * c.a)) AS MyDate
FROM
  (SELECT *
   FROM ZeroThru9Q) AS a,

  (SELECT *
   FROM ZeroThru9Q) AS b,

  (SELECT *
   FROM ZeroThru9Q) AS c;

Create a union query named "TodayPlusMinus1KQ" (for dates +/- 1000 days):

SELECT MyDate
FROM TodayMinus1KQ
UNION
SELECT MyDate
FROM TodayPlus1KQ;

Now you can use the query:

SELECT MyDate
FROM TodayPlusMinus1KQ
WHERE MyDate BETWEEN #05/01/2014# and #05/30/2014#

Answer 5

For Oracle, my solution is:

select trunc(sysdate-dayincrement, 'DD') 
  from dual, (select level as dayincrement 
                from dual connect by level <= 30)

Sysdate can be changed to specific date and level number can be changed to give more dates.

Answer 6

Using a recursive Common Table Expression (CTE), you can generate a list of dates, then select from it. Obviously you normally wouldn't want to create three million dates, so this just illustrates the possibilities. You could simply limit the date range inside the CTE and omit the where clause from the select statement using the CTE.

with [dates] as (
    select convert(datetime, '1753-01-01') as [date] --start
    union all
    select dateadd(day, 1, [date])
    from [dates]
    where [date] < '9999-12-31' --end
)
select [date]
from [dates]
where [date] between '2013-01-01' and '2013-12-31'
option (maxrecursion 0)

On Microsoft SQL Server 2005, generating the CTE list of all possible dates took 1:08. Generating one hundred years took less than a second.