I have 2 column, column_A is origination, column B is source of origination, how to we have result in Column C
Examples: A7 - A5 is 1, A9 -- A7 is 2 due to A9 from A7 and A7 from A5, the same A10 -- A7 is 3 due to A10 from A9 and A9 from A7 and A7 from A5.
Column_A Column_B Result_Column_C
A5
A7 A5 1
A8 B1 1
A9 A7 2
A10 A9 3
Why does A8/B1 have a count of 1, when there is no "parent" record for B1?
If I insert an artificial "parent" obs for B1, this code works:
data have; infile datalines truncover; input col_a $ col_b $; datalines; A5 A7 A5 A8 B1 A9 A7 A10 A9 B1 ; data want; set have; if _n_ = 1 then do; declare hash a (dataset:'have (keep=col_a)'); a.definekey('col_a'); a.definedone(); declare hash b (dataset:'have'); b.definekey('col_b'); b.definedata('col_a'); b.definedone(); end; if a.find(key:col_b) ne 0; /* master parent */ col_c = .; output; col_c = 1; col_b = col_a; rc = b.find(); do while (rc = 0); output; col_c + 1; col_b = col_a; rc = b.find(); end; drop rc; run;
It’s just one to one match ?
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