Can I use the operators > and < in the Lookup transformation in DI Studio?
I need to find if a date is within a date range for a given key and to return only one record for each search.
To answer such questions it's often worth to look into the code DI Studio generates. The DI Lookup transformation generates a data step with a hash lookup - and a hash lookup works via exact key match.
The SQL Join transformation would allow for date ranges.
To answer such questions it's often worth to look into the code DI Studio generates. The DI Lookup transformation generates a data step with a hash lookup - and a hash lookup works via exact key match.
The SQL Join transformation would allow for date ranges.
Tks Patrick!
I will then use the join.
The lookup always returns one record for each match found?
Yes, the first one I believe if there are a multiple matches.
If I want to return only one record for each code below, which component should I use?
- Group by CD and rank by MAX(DATA)
Input:
cd dsc date
1 aaa 2013-01-31
1 bbb 2013-01-02
1 cccc 2013-01-21
2 xxxx 2013-01-12
2 yyyy 2013-01-15
Output:
cd dsc date
1 aaa 2013-01-31
2 yyyy 2013-01-15
Untested - but with a SQL you would need something as below.
You could also use a Proc Sort and then a data step with "if.first cd" - but the data step would need to be user written code.
proc sql;
create table want as
select o.*
from
have o,
(select cd, max(date) as max_date from have group by cd having max(date) as date) i
where o.cd=i.cd and o.date=i.max_date
;
quit;
Try this using the join node with just one input
proc sql;
create table want as
select o.*
from
have o,
having date=max(date)
;
quit;
The hash code generated doesn't use "multidata" so for multiple keys only the first one will be loaded into the hash - and that's then what you get via a look-up.
The rank transformation does not automatically calculate this?
Input:
cd dsc date
1 aaa 2013-01-31
1 bbb 2013-01-02
1 cccc 2013-01-21
2 xxxx 2013-01-12
2 yyyy 2013-01-15
Output:
cd dsc date
1 aaa 2013-01-31
2 yyyy 2013-01-15
May be it does. Make sure you don't have ties.
and.. you should always start a new thread for a new question and mark an answered thread as answered. Else everything becomes a mix-up like here.
OK. I will start a new thread. Tks.
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