topic Re: I Need clarification on Hash Object in SAS Programming

I Need clarification on Hash Object

sahaji — Tue, 14 Jan 2014 18:46:42 GMT

Hi,

I am learning hash objects ,when I was working on the below scenario,it is giving as specified below.please clarify.

I have two data sets ,I am assuming that one is bigger one and one is smaller one.

the smaller data(data1) set consists of following data.

connection_id credit_teamid

the bigger one(master) data set consists of following data.

Connection_id credit_teamid unit_desc group_code

DATA Hash_sample(drop=search);

length connection_id 10;

length credit_team_id unit_desc group_code $20;

if _n_=1 then do;

declare hash first_HT(dataset:"master");

first_ht.definekey("connection_id","credit_team_id");

first_ht.definedata("unit_desc","group_code");

first_ht.definedone();

end;

set data1;

search=first_ht.find();

if search=0 then output;

run;

Here I'm getting the output like this

Even though master data set consists of same connection id and credit team id's more than once,small data set is not merging with all the connection and credit team id's in the master data set.

It is only merging with first occurance(first.) of the connection id and credit team id's of the master data set.

Please clarify.

Re: I Need clarification on Hash Object

CTorres — Tue, 14 Jan 2014 19:51:28 GMT

Try using the Multidata: 'Y' option in the Declare Hash statement: declare hash first_HT(dataset:"master", Multidata: 'Y');

Regards,

Re: I Need clarification on Hash Object

sahaji — Tue, 14 Jan 2014 20:15:17 GMT

Hi CTorres,

I tried with the multidata,It is giving the error message :unknown argument Multidata.

Re: I Need clarification on Hash Object

CTorres — Tue, 14 Jan 2014 21:15:20 GMT

be sure to use the colon(:) in the Multidata option: Multidata:

Maybe double quotes?

Look at the documentation: SAS(R) 9.3 Component Objects: Reference

Regards

Re: I Need clarification on Hash Object

Patrick — Wed, 15 Jan 2014 01:41:31 GMT

For loading "master" into a hash you would need "multidata" with the keys you've chosen. You then would also need to iterate through the groups with the same key as shown here:

SAS(R) 9.3 Component Objects: Reference

But actually for what I believe you're trying to achieve it would be much better to load the small data set into a hash. As the key variables exist in both "master" and "data1" you don't need to define the variables for the hash if "setting" master before the hash definition.

Code as below should do (not tested):

DATA Hash_sample (drop=_:);

set master;

if _n_=1 then

do;

declare hash first_HT(dataset:"data1");

_rc=first_ht.definekey("connection_id","credit_team_id");

_rc=first_ht.definedone();

end;

if first_ht.find()=0 then output;

run;