creating new columns in proc sql

[septemberbulb]

Hello,

I am creating 3 tables using proc sql and I want to create a new column for each of them. I just know case when to create column based on different conditions. But here, I only want to create one to work like a lable: new column=secure the value would be Y

thank you.

[Shmuel · Accepted solution]

In case you want same value in all observations, do:

proc sql;

    create table want 

    as select *,

     'Y' as secure

     from have;

quit;

or use a datastep:

data want;

  set have;

      secure = 'Y';

run;

[Reeza]

Not 100% sure I understand your question but look into either:

COALESCE() to choose one field from the three that isnt' missing

or INDSNAME to identify the source data in a data step. 

[ballardw]

It may help to provide some example data of what one of the sets looks like and what the desired result.

If you want to create variable with the same value for everyrow the easiest is to have something like this in the Select clause:

"Y" as new_var

Example:

proc sql;

   create table work.new as

   select *, 'Y' as new_var

   from sashelp.class;

quit;

[mjsommerville]

A little confused about the question. But you can also add a new variable like this, using alter table and add. This would be in SAS, code is to add a new character variable, length 9, called staffID

proc sql; 

alter table work.sqlinsas 

add staffID char 9 

;