topic SAS SQL: order of results in SAS Procedures

SAS SQL: order of results

AgentA — Sat, 27 May 2017 14:32:51 GMT

Hi guys ,
I am doing inner join using proc sql, please see the below code.

data am;
input name$ age;
datalines;
am 89
am 78
am 45
na 23
;
run;

data am1;
input name$ marks;
datalines;
am 789
am 9081
na 2670
pa 89
sa 90
ka 09
;
run;

proc sql;
select * from am,am1 where am.name=am1.name;
quit;

Question : Why age=78 is below the age=45 where as in data step age=78 is above. Request, kindly explain.

SAS Output:

name age name marks

am	89	am	789
am	45	am	789
am	78	am	789
am	89	am	9081
am	45	am	9081
am	78	am	9081
na	23	na	2670

Re: SAS SQL: order of results

Reeza — Sat, 27 May 2017 14:40:01 GMT

RTM. You didn't specify any order so you cannot expect any order to the data.

Also, I didn't run your code but that output doesn't match the code you've shown either. I'm assuming it's correct but you've truncated the output for some reason.

https://support.sas.com/documentation/cdl/en/sqlproc/69822/HTML/default/viewer.htm#p0hwg3z33gllron184mzdoqwpe3j.htm

If an ORDER BY clause is omitted, then a particular order to the output rows, such as the order in which the rows are encountered in the queried table, cannot be guaranteed—even if an index is present. Without an ORDER BY clause, the order of the output rows is determined by the internal processing of PROC SQL, the default collating sequence of SAS, and your operating environment.

Re: SAS SQL: order of results

Reeza — Sat, 27 May 2017 14:40:53 GMT

Also, that's not an inner join it's a Cartesian join, filtered on marching name.