## Hash table from empty tables

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Posts: 16

# Hash table from empty tables

Something interesting is happening when I am trying to create a hash table from a table with no rows. In the following example Temp1 has no rows, Temp2 has one row. I would expect Temp3 to have one row with missing value for x. But Temp3 has no rows. I have this logic in a big data step with multiple hash tables and as soon as one of the hash table input talbe is empty all the subsequent ones fail to load and nothing is written to output tables in the data step. Anyone know why this happens and how to control it? Thank you.

Proc Sql;

Create Table Temp1 (P Char(1), x Num);

Quit;

Data Temp2;

P="A"; y=3; Output;

Run;

Data Temp3(Drop=rc);

Declare Hash myhash();

myhash.DefineKey('P');

myhash.DefineData('x');

myhash.DefineDone();

eof=0;

Do Until(eof);

Set Temp1 end=eof;

End;

eof=0;

Do Until(eof);

Set Temp2 end=eof;

rc=myhash.find();

output;

End;

Stop;

Run;

Accepted Solutions
Solution
‎02-04-2014 04:37 PM
Posts: 3,852

## Re: Hash table from empty tables

Do while NOT and use different END variables.

Proc Sql;

Create Table Temp1 (P Char(1), x Num);
Quit;

Data Temp2;
p="A"; y=3; Output;

Run;

Data Temp3(Drop=rc);
Declare Hash myhash();
myhash.DefineKey('P');
myhash.DefineData('x');
myhash.DefineDone();

Do while(not eof1);
Set Temp1 end=eof1;

End;

Do while(not eof2);
Set Temp2 end=eof2;
rc=myhash.find();

output;

End;

Stop;

Run;
proc print data=temp3;
run;

All Replies
Solution
‎02-04-2014 04:37 PM
Posts: 3,852

## Re: Hash table from empty tables

Do while NOT and use different END variables.

Proc Sql;

Create Table Temp1 (P Char(1), x Num);
Quit;

Data Temp2;
p="A"; y=3; Output;

Run;

Data Temp3(Drop=rc);
Declare Hash myhash();
myhash.DefineKey('P');
myhash.DefineData('x');
myhash.DefineDone();

Do while(not eof1);
Set Temp1 end=eof1;

End;

Do while(not eof2);
Set Temp2 end=eof2;
rc=myhash.find();

output;

End;

Stop;

Run;
proc print data=temp3;
run;
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