Oracle SQL. Get Dates between two dates

user_13629446 0
Viewed 322

I have a table with two date columns, how can get the dates between these two dates and list them one by one. Here is the test script:

CREATE TABLE t1
   AS
      SELECT DATE '2020-1-31' AS startdate,
             DATE '2020-2-3' AS enddate
      FROM dual
      UNION
      SELECT DATE '2020-2-27' AS startdate,
             DATE '2020-3-3' AS enddate
      FROM dual;

SELECT *
FROM t1;


DROP TABLE t1;

The result set I am expecting is:

enter image description here

How should I do the query? Thanks in advance.

oracle sql
3 Answers

Here you go:

SQL> select * From t1;

STARTDATE  ENDDATE
---------- ----------
01/31/2020 02/03/2020
02/27/2020 03/03/2020

SQL> select a.startdate, a.enddate,
  2    a.startdate + column_value - 1 dt
  3  from t1 a cross join
  4    table(cast(multiset(select level from dual
  5                        connect by level <= a.enddate - a.startdate + 1
  6                       ) as sys.odcinumberlist))
  7  order by dt;

STARTDATE  ENDDATE    DT
---------- ---------- ----------
01/31/2020 02/03/2020 01/31/2020
01/31/2020 02/03/2020 02/01/2020
01/31/2020 02/03/2020 02/02/2020
01/31/2020 02/03/2020 02/03/2020
02/27/2020 03/03/2020 02/27/2020
02/27/2020 03/03/2020 02/28/2020
02/27/2020 03/03/2020 02/29/2020
02/27/2020 03/03/2020 03/01/2020
02/27/2020 03/03/2020 03/02/2020
02/27/2020 03/03/2020 03/03/2020

10 rows selected.

SQL>

This is called a row generator technique (if you'd ever want too Google for it).

user_90979060

Alternate solution

Creating table -

create table mytable(start_date date, end_date date);

Loading data -

insert into mytable values (to_date('01/31/2020','mm/dd/yyyy'),to_date('02/03/2020','mm/dd/yyyy'));

SQL to retrieve list of dates between the given date range -

select
   t.start_date + rownum -1 as dt,
   t.start_date,
   t.end_date
from
   all_objects, mytable t
where
   rownum <=
   t.end_date- t.start_date+1;

db fiddle - https://dbfiddle.uk/?rdbms=oracle_11.2&fiddle=7cd81f5892ad195b72ee1d22a3b44e2a

user_114209840

For actual Oracle versions:

SELECT *
FROM t1,
     lateral(
           select level N,
                  t1.startdate+level-1 dt
           from dual
           connect by level <= t1.enddate - t1.startdate + 1
     );

or

SELECT 
  startdate,
  enddate,
  startdate+n as DT
FROM t1,
     xmltable('0 to xs:integer(.)' 
              passing cast(enddate-startdate as number)
               columns n int path '.'
             )

Full examples:

with t1
   AS (
      SELECT DATE '2020-1-31' AS startdate,
             DATE '2020-2-3' AS enddate
      FROM dual
      UNION
      SELECT DATE '2020-2-27' AS startdate,
             DATE '2020-3-3' AS enddate
      FROM dual
)
SELECT *
FROM t1,
     lateral(
           select level N,
                  t1.startdate+level-1 dt
           from dual
           connect by level <= t1.enddate - t1.startdate + 1
     );

with t1
   AS (
      SELECT DATE '2020-1-31' AS startdate,
             DATE '2020-2-3' AS enddate
      FROM dual
      UNION
      SELECT DATE '2020-2-27' AS startdate,
             DATE '2020-3-3' AS enddate
      FROM dual
)
SELECT 
  startdate,
  enddate,
  startdate+n as DT
FROM t1,
     xmltable('0 to xs:integer(.)' 
              passing cast(enddate-startdate as number)
               columns n int path '.'
             );
user_4291000
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