I have written the following code to perform a hash merge within a data-step.
but the steps after the join is not porforming correctly.
data out_set; set in_set; length var1 var2 8; if _n_ =1 then do; declare hash h1(dataset: 'lkup_1',multidata:'y'); rc= h1.defineKey('key1'); rc= h1.defineData('var1'); rc= h1.defineDone(); declare hash h2(dataset: 'lkup_2' , multidata:'y'); rc= h2.defineKey('key2'); rc= h2.defineData('var2'); rc= h2.defineDone(); end; rc= h1.find(); rc= h2.find(); output; do while (rc=0); rc= h1.find_next(); rc= h2.find_next(); if rc = 0 then output; end; miss_flag = missing(var1); run;
All of the MISS_FLAG are returning null even for obs where var1 is not missing. Ideally, I would like to perform the follows and replace the MISS_FLAG:
VAR = ifn(missing(VAR1), VAR2, VAR1); drop VAR1 VAR2 rc;
Somehow the drop statement was working, but the step above was not. So i tried to investigate with the miss_flag variable.
Anyone could point me to the right direction would be great.
Thanks.
Does in_set contain key1 and key2?
How many observations does in_set contain, and how many are output to out_set?
PS It's always good to post the whole log of the step for reference (use the {i} button to open a window that allows posting with a fixed font and no HTML formatting)
Regarding ".. returning null even for obs where var1 is not missing."
Yes, probably because
rc= h1.find_next();
rc= h2.find_next();
causes the rc of h1 to be overwritten by h2. What exactly is going on, is hard to tell without data.
You have two hash table, so you need two RC. data out_set; set in_set; length var1 var2 8; if _n_ =1 then do; declare hash h1(dataset: 'lkup_1',multidata:'y'); h1.defineKey('key1'); h1.defineData('var1'); h1.defineDone(); declare hash h2(dataset: 'lkup_2' , multidata:'y'); h2.defineKey('key2'); h2.defineData('var2'); h2.defineDone(); end; call missing(var1,var2); rc1= h1.find(); rc2= h2.find(); do while (rc1=0 and rc2=0); output; rc1= h1.find_next(); rc2= h2.find_next(); end; miss_flag = missing(var1); run;
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