BookmarkSubscribeRSS Feed
☑ This topic is solved. Need further help from the community? Please sign in and ask a new question.
Ronein
Meteorite | Level 14

Hello

Here is Hash code to select Last Row by group.

I want to ask-

Lets say there there is another data set called List_tbl and I want to select last row by group only for the groups in data set List_Tbl (So in this example I want to perform it only for groups 'A','C','D')

What is the way to tell SAS to perform it only for the groups in list_tbl?

Please note that in real life List_Tbl will have 200,000 groups and  have table will have 5 millions groups.



data have;
input ID $ date : date9. var;
format date date9.;
cards;
A 01JAN2023 10
B 05JAN2023 5
B 06JAN2023 6
C 15JAN2023 7
C 16JAN2023 8
C 19JAN2023 9
C 20JAN2023 10
D 24JAN2023 2
;
Run;

Data List_tbl;
input ID $;
cards;
A
C
D
;
Run;

data _null_;
dcl hash H (dataset:'have',ordered: "a",duplicate:'r') ;
h.definekey  ("id") ;
h.definedata ("id","date","var") ;/***Var to show in wanted data set**/
h.definedone () ;
h.output(dataset:'want');
stop;
retain _n_   _iorc_ ;
if 0 then do;
set have;
output;
end;
run;
1 ACCEPTED SOLUTION

Accepted Solutions
yabwon
Onyx | Level 15

How about that:

data have;
input ID $ date : date9. var;
format date date9.;
cards;
A 01JAN2023 10
B 05JAN2023 5
B 06JAN2023 6
C 15JAN2023 7
C 16JAN2023 8
C 19JAN2023 9
C 20JAN2023 10
D 24JAN2023 2
;
Run;

Data List_tbl;
input ID $;
cards;
A
C
D
;
Run;


/* sort have */
proc sort data = have;
  by ID date;
Run;

data WANT;

  /* use List_tbl as a dictionary */
  dcl hash H (dataset:'List_tbl');
  h.definekey  ("id") ;
  h.definedone () ;


  do until(END);
    set have end=END;
    by ID;
    /* check if it is the first row and is in the dictionary */
    if first.ID AND H.find()=0 then output;
  end;

  stop;
run;

proc print data = WANT;
run;

?

 

Bart

_______________
Polish SAS Users Group: www.polsug.com and communities.sas.com/polsug

"SAS Packages: the way to share" at SGF2020 Proceedings (the latest version), GitHub Repository, and YouTube Video.
Hands-on-Workshop: "Share your code with SAS Packages"
"My First SAS Package: A How-To" at SGF2021 Proceedings

SAS Ballot Ideas: one: SPF in SAS, two, and three
SAS Documentation



View solution in original post

1 REPLY 1
yabwon
Onyx | Level 15

How about that:

data have;
input ID $ date : date9. var;
format date date9.;
cards;
A 01JAN2023 10
B 05JAN2023 5
B 06JAN2023 6
C 15JAN2023 7
C 16JAN2023 8
C 19JAN2023 9
C 20JAN2023 10
D 24JAN2023 2
;
Run;

Data List_tbl;
input ID $;
cards;
A
C
D
;
Run;


/* sort have */
proc sort data = have;
  by ID date;
Run;

data WANT;

  /* use List_tbl as a dictionary */
  dcl hash H (dataset:'List_tbl');
  h.definekey  ("id") ;
  h.definedone () ;


  do until(END);
    set have end=END;
    by ID;
    /* check if it is the first row and is in the dictionary */
    if first.ID AND H.find()=0 then output;
  end;

  stop;
run;

proc print data = WANT;
run;

?

 

Bart

_______________
Polish SAS Users Group: www.polsug.com and communities.sas.com/polsug

"SAS Packages: the way to share" at SGF2020 Proceedings (the latest version), GitHub Repository, and YouTube Video.
Hands-on-Workshop: "Share your code with SAS Packages"
"My First SAS Package: A How-To" at SGF2021 Proceedings

SAS Ballot Ideas: one: SPF in SAS, two, and three
SAS Documentation



hackathon24-white-horiz.png

The 2025 SAS Hackathon Kicks Off on June 11!

Watch the live Hackathon Kickoff to get all the essential information about the SAS Hackathon—including how to join, how to participate, and expert tips for success.

YouTube LinkedIn

How to Concatenate Values

Learn how use the CAT functions in SAS to join values from multiple variables into a single value.

Find more tutorials on the SAS Users YouTube channel.

SAS Training: Just a Click Away

 Ready to level-up your skills? Choose your own adventure.

Browse our catalog!

Discussion stats
  • 1 reply
  • 703 views
  • 1 like
  • 2 in conversation