How to Generate All Dates Within Multiple Date Ranges Using SQL?

Generating Dates Between Multiple Date Ranges

When dealing with multiple date ranges, generating all dates within these ranges can be a challenge. Let's explore an efficient solution that handles this scenario.

The provided input consists of two date ranges:

ID  START_DATE      END_DATE 
101 April, 01 2013  April, 10 2013 
102   May, 10 2013    May, 12 2013

Our goal is to generate an output table that lists all dates within these ranges:

ID  Dates
101 April, 01 2013 
101 April, 02 2013  
101 April, 03 2013  
101 April, 04 2013  
101 April, 05 2013  
101 April, 06 2013  
101 April, 07 2013  
101 April, 08 2013  
101 April, 09 2013  
101 April, 10 2013  
102   May, 10 2013  
102   May, 11 2013  
102   May, 12 2013

To achieve this, we can utilize the following SQL query:

select 
  A.ID, 
  A.START_DATE+delta dt
from 
  t_dates A, 
  (
     select level-1 as delta 
     from dual 
     connect by level-1 <= (
       select max(end_date - start_date) from t_dates
     )
  )
where A.START_DATE+delta <= A.end_date
order by 1, 2

The query generates all possible date differences within the maximum date range and then adds them to each start date to produce the desired output.

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