tsql - SQL Query to calculate first n customers based on quantity conditions -


i have question not sure how ask.

here example.

product customer txdate       qty apple   peter    2013/02/02   3 apple   edward   2013/02/03   5 apple   sally    2013/02/06   3 apple   emily    2013/02/08   6 orange  ray      2013/02/03   5 orange  simon    2013/02/04   4 orange  billy    2013/02/05   5 orange  david    2013/02/06   2

i want know have purchased first 10 (variable in each product) items , wish query return following results:

apple   peter    2013/02/02   3 apple   edward   2013/02/03   5 apple   sally    2013/02/06   2 orange  ray      2013/02/03   5 orange  simon    2013/02/04   4 orange  billy    2013/02/05   1

i not familiar t-sql therefore appreciated.

thanks lot.

use option apply operator , correlated-subquery

 ;with cte  (       select product, customer, txdate,           isnull(newqty, 10 - max(totalqty) over(partition product)) qty,              max(total) over(partition product) ismatch   dbo.test117 t     cross apply(                 select case when sum(t2.qty) > 10 null else t.qty end,                        case when sum(t2.qty) > 10 null else sum(t2.qty) end,                        sum(t2.qty)                 dbo.test117 t2 --with(forceseek)                                                                                  t.product = t2.product                   , t.txdate >= t2.txdate                 having sum(t2.qty) - t.qty < 10                                                  ) o(newqty, totalqty, total)   )   select product, customer, txdate, qty   cte   ismatch >= 10

demo on sqlfiddle

in order improve performance use index:

create index x on dbo.test117(product) include(customer, txdate, qty)

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