Merge by column has NULL values

[deleted_user]

I have 2 tables
Thanks!

[Doc_Duke]

To use a MERGE with a BY statement, the observations are joined on matching values of CD. Since you have none, the example data would have 8 observations. Your "if in1 and in2;" statement is what causes the output dataset to have 0 observations.

To include all rows of T1, change the IF statement to
IF in1;
In this example, your output dataset, e1, would be the same as t1.

To understand this behavior, get rid of the DROP and subsetting IF, and add a KEEP statement for in1 and in2 and then look at the output.

This paper will help
http://support.sas.com/techsup/technote/ts705.pdf
(I just searched support.sas.com for "merge examples".)

Doc Muhlbaier
Duke

[deleted_user]

Sorry I am kind of new to SAS, but isn't this 'If in1 and in2' statement applicable for assigning the job id to batch id? Why should it affect the MErge?

[Doc_Duke]

&job_id is a macro variable that you haven't defined. To more fully answer your questions, you need to provide a complete example of what you are trying to do and the answers you are looking for. I did answer your question of how to include all rows of T1, but your response indicates that is not the problem you were trying to solve.