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Contributor
Posts: 25

# merging datasets

Hi All,

I'm trying to merge 2 data sets

data one;

input id \$ year ;

datalines;

a 1

a 2

;

run;

data two;

input id \$ sc pt;

datalines;

a 1 50

a 2 60

a 3 40

;

run;

This is the code I used

proc sort data= one;by id;run;

proc sort data= two;by id;run;

data one_two;

merge one(in=a) two(in=b);

if a and b;

by id;

run;

This is the output I got

idyearscpt
a1150
a2260
a2340

Instead, How do I get this output

idyearscpt
a1150
a2260
a.340

THANK YOU!!

Accepted Solutions
Solution
‎08-17-2015 05:10 PM
Super User
Posts: 8,074

## Re: merging datasets

When doing a MANY to MANY merge with a data step SAS will match the records one by one until one of the datasets does not have enough records in the group. The values from that dataset are then retained onto the rest of the records in the group.

To get what you want you just need to add an OUTPUT and CALL MISSING to the end of the data step.

data one_two;

merge one(in=a) two(in=b);

by id;

if a and b;

output;

call missing(of _all_) ;

run;

All Replies
Super User
Posts: 5,876

## Re: merging datasets

You can't get that output in a secure way unless you can't define an extended primary key. Is year and sc related?

Data never sleeps
Solution
‎08-17-2015 05:10 PM
Super User
Posts: 8,074

## Re: merging datasets

When doing a MANY to MANY merge with a data step SAS will match the records one by one until one of the datasets does not have enough records in the group. The values from that dataset are then retained onto the rest of the records in the group.

To get what you want you just need to add an OUTPUT and CALL MISSING to the end of the data step.

data one_two;

merge one(in=a) two(in=b);

by id;

if a and b;

output;

call missing(of _all_) ;

run;

Valued Guide
Posts: 765

## Re: merging datasets

Hi,  another way to get the desired output for those small data sets is to get rid of the BY statement .(by the way, you don't need a RUN statement after a DATALINES file) ...

data one;

input id \$ year @@;

datalines;

a 1 a 2

;

data two;

input id \$ sc pt @@;

datalines;

a 1 50 a 2 60 a 3 40

;

data one_two;

merge one two;

run;

DATA SET ONE-TWO ...

Obs    id    year    sc    pt

1     a       1      1    50

2     a       2      2    60

3     a       .      3    40

Super User
Posts: 10,766

## Re: merging datasets

### Code: Program

`data one;input id \$ year @@;datalines;a 1 a 2; data two;input id \$ sc pt @@;datalines;a 1 50 a 2 60 a 3 40;data one; set one; sc=year;run;data want; merge one two; by id sc;run;`
Super User
Posts: 10,766

## Re: merging datasets

### Code: Program

`data one;input id \$ year @@;datalines;a 1 a 2; data two;input id \$ sc pt @@;datalines;a 1 50 a 2 60 a 3 40;run;/****Alternative Way*****/proc sql; create table _want as  select b.*,a.year   from one as a right join two as b    on a.id=b.id and a.year=b.sc;quit;`
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