sql server 2008 - How can I transpose multiple lines of data into strings with a unidue ID? -


i have file millions of rows need convert. i'm having trouble getting desired result wanted defer experts;

select [id], min ([date]) 'payment1', min ([date]) 'payment2',  'payment2' > 'payment1' min ([date]) 'payment3',  'payment3' > 'payment2' min ([date]) 'payment4',  'payment4' > 'payment3' [fp&a].[dbo].[paymentschedules] group [id] order [id]

it looks want select 4 lowest distinct dates 4 payments. present easy understand way this:

  1. find payment1
  2. join table again find payment2
  3. join table again find payment3
  4. ...

the end result here:

with step1 (   select id, min(date) payment1   ps   group id ), step2 (   select step1.*, min(date) payment2   step1   join ps on step1.id = ps.id   step1.payment1 < ps.date   group step1.id, payment1 ), step3 (   select step2.*, min(date) payment3   step2   join ps on step2.id = ps.id   step2.payment2 < ps.date   group step2.id, payment1, payment2 ), step4 (   select step3.*, min(date) payment4   step3   join ps on step3.id = ps.id   step3.payment3 < ps.date   group step3.id, payment1, payment2, payment3 ) select * step4

here's fiddle showing in action: http://sqlfiddle.com/#!3/66576/8

now makes 4 joins, performance isn't best. if having problems performance, ranking dates, picking 4 lowest (excluding duplicates), , pivoting table.


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