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Data Joins and Pivot Help
Answers
-
Hi,
Sorry, I had the dates backwards.
Swap all references to a.date_changed and b.date_upload in sub-query got_priormonth:WITH got_priormonth AS ( SELECT a.acct , b.score , MONTHS_BETWEEN ( TRUNC (a.date_changed, 'MONTH') , TRUNC (b.date_upload, 'MONTH') ) AS priormonth FROM tableA a JOIN tableB b ON a.acct = b.acct WHERE b.date_upload >= ADD_MONTHS ( TRUNC (a.date_changed, 'MONTH') , -2 ) AND b.date_upload < TRUNC (a.date_changed, 'MONTH') ) SELECT acct , MAX (CASE WHEN priormonth = 2 THEN score ELSE 0 END) AS score2monthprior , MAX (CASE WHEN priormonth = 1 THEN score ELSE 0 END) AS score1monthprior FROM got_priormonth GROUP BY acct ;
Output, using Solomon's data:. ACCT SCORE2MONTHPRIOR SCORE1MONTHPRIOR ---------- ---------------- ---------------- 123 620 650 456 630 680
-
Perfect!
Thanks, Frank. -
Hehe I like Pivot B-)
But recently,I think that group by and max and decode is sometimes readable than Pivot.
Because Pivot do implicit group by and we must image it implicit group bywith a as ( select 123 acct,to_date('1/12/2008','mm/dd/yyyy') date_changed from dual union all select 456,to_date('8/25/2008','mm/dd/yyyy') from dual), b as ( select 123 acct,to_date('11/30/2007','mm/dd/yyyy') date_upload,620 score from dual union all select 123,to_date('12/31/2007','mm/dd/yyyy'),650 from dual union all select 123,to_date('01/31/2008','mm/dd/yyyy'),712 from dual union all select 123,to_date('02/29/2008','mm/dd/yyyy'),800 from dual union all select 456,to_date('05/31/2008','mm/dd/yyyy'),520 from dual union all select 456,to_date('06/30/2008','mm/dd/yyyy'),630 from dual union all select 456,to_date('07/31/2008','mm/dd/yyyy'),680 from dual union all select 456,to_date('08/31/2008','mm/dd/yyyy'),710 from dual union all select 456,to_date('09/30/2008','mm/dd/yyyy'),780 from dual union all select 456,to_date('10/31/2008','mm/dd/yyyy'),786 from dual union all select 456,to_date('11/30/2008','mm/dd/yyyy'),823 from dual) select Acct,Score2MonthPrior,Score1MonthPrior from (select a.acct,b.score, extract( year from a.date_changed)*12 +extract(month from a.date_changed) -extract( year from b.date_upload)*12 -extract(month from b.date_upload) as diff from a join b on a.acct = b.acct) Pivot (max(score) for diff in(2 as Score2MonthPrior, 1 as Score1MonthPrior)); ACCT Score2MonthPrior Score1MonthPrior ---- ---------------- ---------------- 123 620 650 456 630 680
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I like this query more than my previous :8}
select acct, max(decode(diff,2,score)) as Score2MonthPrior max(decode(diff,1,score)) as Score1MonthPrior, from (select a.acct,b.score, months_between(trunc(a.date_changed,'mm'), trunc(b.date_upload,'mm')) as diff from a join b on a.acct = b.acct) where diff in(1,2) group by acct; acct Score2MonthPrior Score1MonthPrior ---- ---------------- ---------------- 123 620 650 456 630 680
This discussion has been closed.