how to assign second varibale in sql

[thanikondharish]

F1	F2	F3	F4	F5
STUDYID	1	Study Identifier	string	8
DOMAIN	2	Domain Abbreviation	string	2
USUBJID	3	Unique Subject Identifier	string	16
DSSEQ	4	Sequence Number	integer	8
DSTERM	5	Reported Term for the Disposition Event	string	200
DSDECOD	6	Standardized Disposition Term	string	200
DSCAT	7	Category for Disposition Event	string	50
DSSCAT	8	Subcategory for Disposition Event	string	50
VISITNUM	12	Visit Number	integer	8
VISIT	13	Visit Name	string	50
DSSTDTC	14	Start Date/Time of Disposition Event	string	19
DSSTDY	16	Study Day of Start of Disposition Event	integer	8

PROC SQL ;
CREATE TABLE AT AS
SELECT 'LABEL'||' '||STRIP(F1)||' '||"='"||STRIP(F3)||"'" AS NEW,
CASE WHEN UPCASE(F4)='STRING' THEN
STRIP(F1)||' '||"='"||STRIP(F3)||"'"||' LENGTH=$'||STRIP(F5)||'.' END
AS NEW1,
case WHEN CALCULATED NEW1=' ' THEN NEW END AS NEW2
FROM S1 ;
QUIT;

when concatinated some variable it gives error

can you explain that

[Kurt_Bremser]

Start with accepting solutions to your previous questions.

[RW9]

Follow up marking posts as answered by providing test data in the form of a datastep:

https://communities.sas.com/t5/SAS-Communities-Library/How-to-create-a-data-step-version-of-your-dat...

Then show what the output should look like.  Maybe:

data want;
  set have;
  length line $2000;
  line=catx(' ','label',f1,'=',quote(f3),'length=',ifc(f4='string',cats('$',f5),f5));
run;