I have two SAS data tables. The first has many millions of records, and each record is identified with a sequential record ID, like this:
Table A
Rec Var1 Var2 ... VarX
1 ...
2
3
The second table specifies which rows from Table A should be assigned a coding variable:
Table B
Code BegRec EndRec
AA 1200 4370
AX 7241 9488
BY 12119 14763
So the first row of Table B means any data in Table A that has rec between 1200 and 4370 should be assigned code AA.
I know how to accomplish this with proc sql, but I want to see how this is done with a hash object.
In SQL, it's just:
proc sql;
select b.code, a.*
from tableA a, tableB b
where b.begrec<=a.rec<=b.endrec;
quit;
My actual data contains hundreds of gigabytes of data, so I want to do the processing as efficiently as possible. My understanding is that using a hash object may help here, but I haven't been able to figure out how to map what I'm doing to use that way.
A hash object solution (data input code borrowed from #Rob_Penridge).
data big;
do rec = 1 to 20000;
output;
end;
run;
data lookup;
input Code $ BegRec EndRec;
datalines;
AA 1200 4370
AX 7241 9488
BY 12119 14763
;
run;
data created;
format code $4.;
format begrec endrec best8.;
if _n_=1 then do;
declare hash h(dataset:'lookup');
h.definekey('Code');
h.definedata('code','begrec','endrec');
h.definedone();
call missing(code,begrec,endrec);
declare hiter iter('h');
end;
set big;
iter.first();
do until (rc^=0);
if begrec <= rec <= endrec then do;
code_dup=code;
end;
rc=iter.next();
end;
keep rec code_dup;
run;
I'm not sure a hash table would even be the most efficient approach here. I would probably solve this problem using a SELECT statement as the conditional logic will be fast and it still only requires 1 parse through the data:
select;
when ( 1200 <= _n_ <=4370) code = 'AA';
...
otherwise;
end;
Assuming that you will need to run this code multiple times and the data may change each time you may not want to hardcode the select statement. So the best solution would dynamically build it using a macro. I have a utility macro I use for these kinds of situations (included at the bottom):
1) Create the data
data big;
do i = 1 to 20000;
output;
end;
run;
data lookup;
input Code $ BegRec EndRec;
datalines;
AA 1200 4370
AX 7241 9488
BY 12119 14763
;
run;
2) Save the contents of the smaller table into macro variables. You could also do this using call symput or other preferred method. This method assumes you don't have too many rows in your lookup table.
%table_parse(iDs=lookup, iField=code , iPrefix=code);
%table_parse(iDs=lookup, iField=begrec, iPrefix=begrec);
%table_parse(iDs=lookup, iField=endrec, iPrefix=endrec);
3) Dynamically build the SELECT statement.
%macro ds;
%local cnt;
data final;
set big;
select;
%do cnt=1 %to &code;
when (&&begrec&cnt <= _n_ <= &&endrec&cnt) code = "&&code&cnt";
%end;
otherwise;
end;
run;
%mend;
%ds;
Here is the utility macro:
/*****************************************************************************
** MACRO.TABLE_PARSE.SAS
**
** AS PER %LIST_PARSE BUT IT TAKES INPUT FROM A FIELD IN A TABLE.
** STORE EACH OBSERVATION'S FIELD'S VALUE INTO IT'S OWN MACRO VARIABLE.
** THE TOTAL NUMBER OF WORDS IN THE STRING IS ALSO SAVED IN A MACRO VARIABLE.
**
** THIS WAS CREATED BECAUSE %LIST_PARSE WOULD FALL OVER WITH VERY LONG INPUT
** STRINGS. THIS WILL NOT.
**
** EACH VALUE IS STORED TO ITS OWN MACRO VARIABLE. THE NAMES
** ARE IN THE FORMAT <PREFIX>1 .. <PREFIX>N.
**
** PARAMETERS:
** iDS : (LIB.DATASET) THE NAME OF THE DATASET TO USE.
** iFIELD : THE NAME OF THE FIELD WITHIN THE DATASET.
** iPREFIX : THE PREFIX TO USE FOR STORING EACH WORD OF THE ISTRING TO
** ITS OWN MACRO VARIABLE (AND THE TOTAL NUMBER OF WORDS).
** iDSOPTIONS : OPTIONAL. ANY DATSET OPTIONS YOU MAY WANT TO PASS IN
** SUCH AS A WHERE FILTER OR KEEP STATEMENT.
**
******************************************************************************
** HISTORY:
** 1.0 MODIFIED: 01-FEB-2007 BY: ROBERT PENRIDGE
** - CREATED.
** 1.1 MODIFIED: 27-AUG-2010 BY: ROBERT PENRIDGE
** - MODIFIED TO ALLOW UNMATCHED QUOTES ETC IN VALUES BEING RETURNED BY
** CHARACTER FIELDS.
** 1.2 MODIFIED: 30-AUG-2010 BY: ROBERT PENRIDGE
** - MODIFIED TO ALLOW BLANK CHARACTER VALUES AND ALSO REMOVED TRAILING
** SPACES INTRODUCED BY CHANGE 1.1.
** 1.3 MODIFIED: 31-AUG-2010 BY: ROBERT PENRIDGE
** - MODIFIED TO ALLOW PARENTHESES IN CHARACTER VALUES.
** 1.4 MODIFIED: 31-AUG-2010 BY: ROBERT PENRIDGE
** - ADDED SOME DEBUG VALUES TO DETERMINE WHY IT SOMETIMES LOCKS TABLES.
*****************************************************************************/
%macro table_parse(iDs=, iField=, iDsOptions=, iPrefix=);
%local dsid pos rc cnt cell_value type;
%let cnt=0;
/*
** OPEN THE TABLE (AND MAKE SURE IT EXISTS)
*/
%let dsid=%sysfunc(open(&iDs(&iDsOptions),i));
%if &dsid eq 0 %then %do;
%put WARNING: MACRO.TABLE_PARSE.SAS: %sysfunc(sysmsg());
%end;
/*
** GET THE POSITION OF THE FIELD (AND MAKE SURE IT EXISTS)
*/
%let pos=%sysfunc(varnum(&dsid,&iField));
%if &pos eq 0 %then %do;
%put WARNING: MACRO.TABLE_PARSE.SAS: %sysfunc(sysmsg());
%end;
%else %do;
/*
** DETERMINE THE TYPE OF THE FIELD
*/
%let type = %upcase(%sysfunc(vartype(&dsid,&pos)));
%end;
/*
** READ THROUGH EACH OBSERVATION IN THE TABLE
*/
%let rc=%sysfunc(fetch(&dsid));
%do %while (&rc eq 0);
%let cnt = %eval(&cnt + 1);
%if "&type" = "C" %then %do;
%let cell_value = %qsysfunc(getvarc(&dsid,&pos));
%if "%trim(&cell_value)" ne "" %then %do;
%let cell_value = %qsysfunc(cats(%nrstr(&cell_value)));
%end;
%end;
%else %do;
%let cell_value = %sysfunc(getvarn(&dsid,&pos));
%end;
%global &iPrefix.&cnt ;
%let &iPrefix.&cnt = &cell_value ;
%let rc=%sysfunc(fetch(&dsid));
%end;
/*
** CHECK FOR ABNORMAL TERMINATION OF LOOP
*/
%if &rc ne -1 %then %do;
%put WARNING: MACRO.TABLE_PARSE.SAS: %sysfunc(sysmsg());
%end;
/*
** ENSURE THE TABLE IS CLOSED SUCCESSFULLY
*/
%let rc=%sysfunc(close(&dsid));
%if &rc %then %do;
%put WARNING: MACRO.TABLE_PARSE.SAS: %sysfunc(sysmsg());
%end;
%global &iPrefix;
%let &iPrefix = &cnt ;
%mend;
Other examples of calling this macro:
%table_parse(iDs=sashelp.class, iField=sex, iPrefix=myTable, iDsOptions=%str(where=(sex='F')));
%put &mytable &myTable1 &myTable2 &myTable3; *etc...;
I'd be tempted to use the direct access method POINT= here, this will only read the required row numbers rather than the whole dataset.
Here is the code, which uses the same create data code as in Rob's answer.
data want;
set lookup;
do i=begrec to endrec;
set big point=i;
output;
end;
drop begrec endrec;
run;
If you have the code column already in the big dataset and you just wanted to update the values from the lookup dataset, then you could do this using MODIFY.
data big;
set lookup (rename=(code=code1));
do i=begrec to endrec;
modify big point=i;
code=code1;
replace;
end;
run;
Here's my solution, using proc format. This is also done in-memory, much like a hash table, but requires less structural code to work.
(Data input code also borrowed from #Rob_Penridge.)
data big;
do rec = 1 to 20000;
output;
end;
run;
data lookup;
input Code $ BegRec EndRec;
datalines;
ZZ 0 20
JJ 40 60
AA 1200 4370
AX 7241 9488
BY 12119 14763
;
run;
data lookup_f;
set lookup;
rename
BegRec = start
EndRec = end
Code = label;
retain fmtname 'CodeRecFormat';
run;
proc format library = work cntlin=lookup_f; run;
data big_formatted;
format rec CodeRecFormat.;
format rec2 8.;
length code $5.;
set big;
code = putn(rec, "CodeRecFormat.");
rec2 = rec;
run;
Related
I am trying to write a macro that display age from 20-40 or >=30 only when it is passed as a parameter.
The code looks like:
%macro detReport(p_age=);
proc sql;
create table detail as
select acct_id,
name format=$20. ,
int(yrdif(Birthday,today(),'ACTUAL')) as Age,
balance,
state,
last_Tran_date
from profile
%if &p_age ne "" %then %do;
%if %index(&p_age,-) > 0 %then %do;
where int(yrdif(Birthday,today(),'ACTUAL')) between (%scan(&p_age,1,"-") and
%scan(&p_age,2,"-"))
%end;
%end;
%else %do;
where (int(yrdif(Birthday,today(),'ACTUAL')) &p_age);
%end;
quit;
proc print data =detail ;
run;
%mend detReport;
%detReport( p_age =20-40)
The code works when a single value is passed (like >=30) but gives error when 20-40 is passed.
Any help is appreciated!
P.S A beginner here!
Why not just let the caller pass in the logic?
where (int(yrdif(Birthday,today(),'ACTUAL')) &p_age)
...
%detReport( p_age =between 20 and 40)
%detReport( p_age = >= 40)
I'm having some trouble referencing a global macro variable outside of the macro to create a new data set. The global variable was created to run a loop for creating several yearly data sets using a vector of specified years, as you can see in the code below:
%macro loopyear;
%global year;
%do year = 2004 %to 2017;
proc import datafile = "C:\Filepath\blah.txt"
dbms = dlm out = blah&year.; /*Creates a dataset for each year, e.g. blah2004, blah2005, etc.) */
delimiter = " ";
getnames = no;
run;
data blah&year.;
set blah&year.;
year = &year.;
run;
proc sql;
create table blah&year._rail as
select year, var1, var2, var3, var4
from blah&year.
where var2= "rail";
quit;
%end;
%mend loopyear;
%loopyear;
/*Merge all year datasets into one master set*/
data blah_total;
set blah&year._rail;
run;
When I try to create the master data set outside of the macro, however, I get the following error:
data blah;
set blah&year._rail;
run;
ERROR: File work.blah2018_rail.data does not exist
This is frustrating because I'm only trying to create the master set based on 2004-2017 data, as referenced in the macro variable. Can someone help me pinpoint my error -- is it in the way I defined the global variable, or am I missing a step somewhere? Any help is appreciated.
Thanks!
This is an interesting quirk of both macro and data step do-loops in SAS - the loop counter is incremented before the exit condition is checked, so after your loop has run it will be one increment past your stop value, e.g.:
%macro example;
%do i = 1 %to 3;
%put i = &i;
%end;
%put i = &i;
%mend;
%example;
Output:
i = 1
i = 2
i = 3
i = 4
For your final step you probably want the set statement to look like this:
set blah2004_rail ... blah2017_rail;
You could write a macro loop to generate the list and move the data step inside your macro, e.g.
set %do year = 2004 %to 2017; blah&year._rail %end;;
The second semi-colon is important! You need one to close the %end and one to terminate the set statement.
Change your naming structure. Have a common prefix and put the year at the end, then you can use the semi colon to short reference all the datasets at once.
%macro loopyear;
%global year;
%do year = 2004 %to 2017;
proc import datafile = "C:\Filepath\blah.txt"
dbms = dlm out = blah&year.; /*Creates a dataset for each year, e.g. blah2004, blah2005, etc.) */
delimiter = " ";
getnames = no;
run;
data blah&year.;
set blah&year.;
year = &year.;
run;
proc sql;
create table blah_rail_&year. as
select year, var1, var2, var3, var4
from blah&year.
where var2= "rail";
quit;
%end;
%mend loopyear;
%loopyear;
/*Merge all year datasets into one master set*/
data blah_total;
set blah_rail: ;
run;
I wonder if there is a way to query in SAS to select a subgroup, just like select option in Postgres
SELECT *
FROM s.diagnoses
WHERE icd9code = ANY ('{2910,2911,2912,2913,2914,2915,3456,3457,3458}');
Also is there way to specify ranges instead of the actual value eg: between 2910-2915
The diagnosis codes are characters not numeric. I am using the SAS University Edition.
In case you want to specify range then you have to convert the character field into numeric and then give the range
/***** if you want to mention each icd9code*****/
data have;
set diagnoses (where=(icd9code in ('2910' '2911' '2912' '2913' '2914' '2915' '3456' '3457' '3458')));
run;
/***** if you want to give range *****/
data have;
set diagnoses;
if input(icd9code ,4.) >= 2910 and input(icd9code ,4.) <= 3458;
run;
Let me know in case of any queries.
If it is a character you cannot use the range. But you can use the in statement
SELECT * FROM s.diagnoses WHERE icd9code in ('2910','2911','2912');
To select range. You can define your own macro to generate strings of range like this
%macro range(start, stop);
%if &start. = &stop. %then %do;
"&stop."
%end;
%else %do;
"&start.", %range(%sysevalf(&start+1), &stop);
%end;
%mend range;
%put %range(2910, 2915);
* -> "2910", "2911", "2912", "2913", "2914", "2915"
Then assign it to a macro variable and use it in you where statement within proc sql
%let subset1 = %range(2910, 2915);
proc sql noprint;
create table want as
select *
from
have
where var_want in (&subset1.);
quit;
You can then define multiple subset variables with different ranges and combination them in where condition to achieve more complex subsetting.
For ranges you want to include in their entirety, you can use inequalities directly - no 'input' required, as long as you have leading zeros, and for the rest you can use in, e.g.
data example;
length char $1;
do i = 64 to 100;
char = byte(i);
output;
end;
run;
proc sql;
create table want as
select * from example where 'A' <= char <= 'Z' or char in ('[',']');
quit;
I have table lookup values as below
sno date
1 200101
2 200102
3 200103
4 200104
I wrote below macro
%let date=200102
proc sql;
select sno into :no from lookup where date=&date.;
quit;
I need a help on how to convert the entire table lookup into macro increment by creating first s.no and date as two macro variable then increment. So that i don’t need to update dates in my table lookup every time. So if i look up for date 201304 i need to get its corresponding s.no
Is there pattern to the SNO values? Are you basically numbering the months since 01JAN2001? If so then use INTCK() function.
data test;
input date yymmdd8. ;
format date yymmdd10. ;
sno = 1+intck('month','01JAN2001'd,date);
cards;
20010112
20010213
20010314
20010415
;
So you could create two macro variables. One with the base date and the other with the base SNO value.
36 %let basedate='01JAN2001'd ;
37 %let basesno=1;
38 %let date='01JAN2001'd ;
39 %let sno=%eval(&basesno + %sysfunc(intck(month,&basedate,&date)));
40 %put &=date &=sno;
DATE='01JAN2001'd SNO=1
41
42 %let date="%sysfunc(today(),date9)"d;
43 %let sno=%eval(&basesno + %sysfunc(intck(month,&basedate,&date)));
44 %put &=date &=sno;
DATE="16NOV2017"d SNO=203
If you want to simply translate one (unique) value into another. You can use (in)formats. They can do much more than just changing how data are read/displayed. They are easy to use, fast (in-memory) and don't depend on the table once created. Change the library to a permanent one if work (=> temporary library) doesn't suit your needs.
options fmtsearch=(formats,work);
data fmt(keep = fmtname type start end label hlo default);
length fmtname $10 type $1 start end $6 label 8 hlo $1 default 8;
fmtname = 'date_to_no';
type = 'I';
label=0;
do y = 2001 to 2099;
do m = 1 to 12;
start = put(y,4.) || put(m,z2.);
end = start;
label + 1;
default=50; /*default length of the string compared when informat is used. Should be higher than both start and end*/
output;
end;
end;
/*if you want to assign a value (=label) to inputs not found. In this case it's -2*/
hlo="O";
start = "";
end = start;
label= -2;
output;
run;
proc format library=work cntlin=fmt;
run;
data test;
no = input('200101',date_to_no.); output;
no = input('201710',date_to_no.); output;
no = input('201713',date_to_no.); output;
run;
Build a lookup table dynamically and create a macro variable for each row in the table. The macro variables will be named date_200101,date_200102,...and so on. They will contain a value equal to the corresponding sno value:
data lookup;
length var_name $20;
do sno = 1 to intck('month','01jan2001'd,date())+1;
date = input(put(intnx('month','01jan2001'd, sno-1, 'beginning'),yymmn6.),best.);
var_name = cats('date_',date);
call symput(var_name, cats(sno));
output;
end;
run;
You can then refer to the macro variables like so:
%let date =200103;
%put &&date_&date;
...or...
%put &date_200101;
The first usage example is using double macro resolution. Basically the macro processes needs to perform 2 iterations of the macro token &&date_&date in order to fully resolve it. On the first pass, it gets resolved to &date_200101. On the second pass, the macro token &date_200101 gets resolved to 1.
I'm having an issue with resolving macro variables within a macro. I think the issue is the language, and how SAS is sending my statements to the Macro Processor vs. Compiler.
Here's the jist of my code:
....some import statements...
%MACRO FCERR(date=);
%LET REMHOST=MainFrame PORT;
SIGNON REMHOST USER=&SYSUSERID. PASSWORD= _PROMPT_;
%SYSLPUT date=&yymm. ;
RSUBMIT;
FILENAME FIN "MY.FILE.QUALIFIERS" DISP = shr;
......some datasteps......
LIBNAME METRO "My.File.Qualifiers" DISP=shr;
/********************************************************************
******* *********
** ** **
******* ** * **
** ** * **
******* *********
*
/*******************************************************************/
%IF %SYSFUNC(EXIST(work.EQ_&date._FIN)) %THEN %DO;
PROC UPLOAD Data = work.EQ_&date._FIN
OUT = work.EQ_&date._FIN;
..........a bunch of data steps..................
PROC SQL NOPRINT ;
select count(*) as EQB format=10.0 INTO :EQBEF from EQ_1701_FIN ;
select count(*) as EQA format=10.0 INTO :EQAFTER from trunc_fin_eq ;
QUIT ;
%PUT &EQBEF;
%PUT &EQAFTER;
%IF %SYSFUNC(STRIP(&EQBEF.)) ~= %SYSFUNC(STRIP(&EQAFTER.)) %THEN %DO;
options emailhost= MYEMAILHOST.ORG ;
filename mail email ' '
to= (&recip.)
subject = "EQ Error QA/QC";
DATA _NULL_;
file mail ;
put "There were potential errors processing the Equifax Error file.";
put "The input dataset contains %SYSFUNC(STRIP(&EQBEF.)) observations.";
put "The output dataset contains %SYSFUNC(STRIP(&EQAFTER.)) observations.";
put "Please check the SAS log for additional details.";
RUN;
%END;
%END;
%ENDRSUBMIT;
%SIGNOFF;
%MEND;
%FCERR(date=&yymm.);
I keep getting an error that is stopping my macro from processing. This is it:
> SYMBOLGEN: Macro variable EQBEF resolves to 24707
> 24707
> MLOGIC(FCERR): %PUT &EQAFTER
> WARNING: Apparent symbolic reference EQAFTER not resolved.
> &EQAFTER
> SYMBOLGEN: Macro variable EQBEF resolves to 24707
> WARNING: Apparent symbolic reference EQAFTER not resolved.
> WARNING: Apparent symbolic reference EQAFTER not resolved.
> ERROR: A character operand was found in the %EVAL function or %IF condition where a numeric
> operand is required. The condition was: %SYSFUNC(STRIP(&EQBEF.)) ~=
> %SYSFUNC(STRIP(&EQAFTER.))
> ERROR: The macro FCERR will stop executing.
Question: Is SAS trying to process my second (i.e. the inside) %IF %THEN statement before it compiles and executes the Data steps above %IF %SYSFUNC(STRIP(&EQBEF.)) ~= %SYSFUNC(STRIP(&EQAFTER.)) %THEN %DO; I can see from the log that SAS is pumping out the error before it is creating the datasets from my datasteps, and I believe that the reason &EQBEF is resolving is because it is creating using PROC UPLOAD;
If so, How can I prevent SAS from executing the second %IF %THEN until the datasteps are processed, since my second select statement in proc sql; is dependent upon the datasteps executing.
Also, I'm having trouble getting my date variable to resolve in proc sql;
E.G.
PROC SQL NOPRINT ;
select count(*) as EQB format=10.0 INTO :EQBEF from EQ_1701_FIN ;
select count(*) as EQA format=10.0 INTO :EQAFTER from trunc_fin_eq ;
QUIT ;
is ideally:
PROC SQL NOPRINT ;
select count(*) as EQB format=10.0 INTO :EQBEF from EQ_&DATE._FIN ;
select count(*) as EQA format=10.0 INTO :EQAFTER from trunc_fin_eq ;
QUIT ;
but &DATE. won't resolve in that proc sql statement, but resolves perfectly fine in all my of my libname statements, etc. Is there some contingency as to why &date. won't resolve within PROC SQL?.....Do I need to have every variable used in my macro referenced in the Parameter List?
Your macro is running on your local SAS session, but because of the RSUBMIT; and ENDRSUBMIT; statements your SQL code that is generating the macro variable is running on the remote SAS session but the macro statements are referencing the local macro variable.
For example try this simple program that creates a local and a remote macro variable and tries to show the values.
signon rr sascmd='!sascmd';
%let mvar=Local ;
%syslput mvar=Remote ;
%put LOCAL &=mvar;
rsubmit rr;
%put REMOTE &=mvar ;
endrsubmit;
signoff rr;
If you run it in open SAS the %PUT statements will show that MVAR is equal to LOCAL and REMOTE , respectively.
But it you wrap inside a macro a run it
%macro xx;
signon rr sascmd='!sascmd';
%let mvar=Local ;
%syslput mvar=Remote ;
%put LOCAL &=mvar;
rsubmit rr;
%put REMOTE &=mvar ;
endrsubmit;
signoff rr;
%mend xx;
options mprint;
%xx;
You will see that both %PUT statements run in the local server and display the value of the local macro variable.
Check the log for the second select
select count(*) as EQA format=10.0 INTO :EQAFTER from trunc_fin_eq ;
If that data set doesn't exist, the macro variable won't be created.
You can set it to 0 to initialize it:
%let EQAFTER=0;