Databases
StackOverflow2013
Postsdbo
PO
 

Note that there are some explanatory texts on larger screens.

plurals
  1. PO
    primarykey
    data
    text
    <p>I couldn't get the response from ngz to work when the input table contains multiple ids and date ranges that span years. I have a solution that does work, but with qualifications. It will only give you the correct answers if you know that you have a row for every month/year/id combination within the range. If there are "holes" it won't work. If you have holes, I know of know good way to do it other than writing some PL/SQL and using a cursor loop to create a new table in the format you want.</p> <p>By the way, this is why data modeled this way is an abomination. You should always store stuff as start/from range records, not as discrete time period records. It's trivial to transform the former into the latter with a "multiplier" table, but it's almost impossible (as you've seen) to go the other direction.</p> <pre><code>SELECT ID , VALUE , start_date , end_date FROM (SELECT ID , VALUE , start_date , CASE WHEN is_last = 0 THEN LEAD(end_date) OVER(PARTITION BY ID ORDER BY start_date) ELSE end_date END end_date , is_first FROM (SELECT ID , VALUE , TO_CHAR(the_date, 'YYYY.MM') start_date , TO_CHAR(NVL(LEAD(the_date - 31) OVER(PARTITION BY ID ORDER BY YEAR , MONTH), the_date), 'YYYY.MM') end_date , is_first , is_last FROM (SELECT ID , YEAR , MONTH , TO_DATE(TO_CHAR(YEAR) || '.' || TO_CHAR(MONTH) || '.' || '15', 'YYYY.MM.DD') the_date , VALUE , ABS(SIGN(VALUE -(NVL(LAG(VALUE) OVER(PARTITION BY ID ORDER BY YEAR , MONTH), VALUE - 1)))) is_first , ABS(SIGN(VALUE -(NVL(LEAD(VALUE) OVER(PARTITION BY ID ORDER BY YEAR , MONTH), VALUE - 1)))) is_last FROM test_table) WHERE is_first = 1 OR is_last = 1)) WHERE is_first = 1 </code></pre>
    singulars
    1. This table or related slice is empty.
    1. POSQL Query to Collapse Duplicate Values By Date Range
      singulars
      1. PTQuestion
    1. PTAnswer
    1. This table or related slice is empty.
    1. This table or related slice is empty.
    plurals
    1. This table or related slice is empty.
    1. This table or related slice is empty.
    1. This table or related slice is empty.
    1. This table or related slice is empty.
    1. This table or related slice is empty.
    1. COSee my solution above for a version (the 2nd version) that works even if there are "holes".
      singulars
      1. PO
      1. UStpdi
 

Querying!

 
Guidance
A row detail

Detail views are divided into sections. All the information in the data section comes from columns in the selected row. The other sections display data from other, related rows.

Related data can be related in a to-one or a to-many fashion. Captions of data related in a to-many fashion link to a list view showing a filtered view of the table.

Try moving around until you find a non-empty to-many entry and click on the label to get to one. You can move back to the root by clicking on the database name in the header.

SQuiL has stopped working due to an internal error.

If you are curious you may find further information in the browser console, which is accessible through the devtools (F12).

Reload