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list of days between dates - oracle sql

Posted on 2010-11-19
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Last Modified: 2013-12-18
I have a number of assessments which cover periods of time.

the attachment shows -

fig 1. the current output of o_assessments table
fig 2. desired output.

I need to be able to list all days which the assessments cover, (ie the days between the start and end date). Hopefully my requirments are clear from the sample data.

example-table.xls
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Question by:tonMachine100
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5 Comments
 
LVL 74

Expert Comment

by:sdstuber
ID: 34174531
try this

SELECT     asm_start_date + n asm_date, asm_type, asm_id
      FROM o_assessments,(select level - 1 n from dual connect by level < 100)
      where asm_start_date + n <= asm_end_date
  ORDER BY asm_date, asm_type, asm_id  
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LVL 74

Expert Comment

by:sdstuber
ID: 34174545
adjust the 100 to some number big enough to cover your largest date span (but not grossly over sized)

you could generate with a sub query so it would be an exact fit but that would require an extra hit on your table to generate,  so probably not worth it if you can determine an upper limit on your own.
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LVL 74

Expert Comment

by:sdstuber
ID: 34175323
alternate method,  requires a couple more internal sort operations (use autotrace to confirm) but doesn't require extra IO to the table or need you to guess at a maximum range


alternate method,  requires a couple more sort operations but doesn't require a guess of how many rows you might need


SELECT   asm_start_date + COLUMN_VALUE asm_date, asm_type, asm_id
    FROM (SELECT o_assessments.*,
                 (SELECT     COLLECT(LEVEL - 1)
                        FROM DUAL
                  CONNECT BY asm_start_date + LEVEL - 1 <= asm_end_date)
                     n
            FROM o_assessments) x,
         TABLE(n)
ORDER BY asm_date, asm_type
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LVL 74

Accepted Solution

by:
sdstuber earned 2000 total points
ID: 34176455
yet another method, should be equivalent to previous post, but slightly more compact

SELECT   asm_start_date + COLUMN_VALUE asm_date, asm_type, asm_id
    FROM (SELECT *
            FROM o_assessments,
                 TABLE(SELECT     COLLECT(LEVEL - 1)
                             FROM DUAL
                       CONNECT BY asm_start_date + LEVEL - 1 <= asm_end_date))
ORDER BY asm_date, asm_type

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Author Closing Comment

by:tonMachine100
ID: 34179663
This is great thanks.

(I'm just about to ask another question which is related to this one - so if you could check this one out too that would be appreciated)
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