teradata - Append previous transaction date SQL -


i have table shows customer_id, product_id, browse_date, purchase_date, , difference between browse , purchase date. looks this.

id  pid  b_date     p_date    1   001  7/20/2014  7/20/2014 1   001  7/20/2014  7/20/2014 1   002  7/20/2014  7/20/2014 2   001  7/20/2014  7/20/2014 2   001  7/20/2014  8/01/2014 2   002  7/25/2014  8/01/2014 2   002  7/26/2014  8/01/2014 2   002  7/28/2014  8/01/2014 2   002  7/28/2014  8/01/2014

what efficient way append recent purchase date each customer previous latest purchase. so, result this.

id  pid  b_date     p_date     latest_purchase_date 1   001  7/20/2014  7/20/2014  'n/a' 1   001  7/20/2014  7/20/2014  'n/a' 1   002  7/20/2014  7/20/2014  'n/a' 2   001  7/20/2014  7/20/2014  'n/a' 2   001  7/20/2014  8/01/2014  7/20/2014 2   002  7/25/2014  8/01/2014  7/20/2014 2   002  7/26/2014  8/01/2014  7/20/2014 2   002  7/28/2014  8/01/2014  7/20/2014 2   002  7/28/2014  8/01/2014  7/20/2014

i'm on teradata 13.1

there's no lag in teradata, it's easy rewrite.

as there multiple rows same p_date need keep track whenever changes.

select id, pid, b_date, p_date    ,max(last_dt) -- fill nulls last date     on (partition id order p_date, last_dt desc           rows unbounded preceding)  (    select id, pid, b_date, p_date,       nullif(min(p_date) -- return date when there's change, otherwise null              on (partition id order p_date                    rows between 1 preceding , 1 preceding)             , p_date) last_dt    vt  ) dt

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