What does “variable = .” (variable = dot) mean in Oracle SQL/SAS?
问题 I am converting a SAS script to Python, where the SAS script was interfacing with an Oracle database, and the Python will be interfacing with a PostgreSQL database. In the SAS code, I found this statement: proc sql noprint; create table table_name as select distinct wtn from another_table where account = . ; What does "where account = ." mean in Oracle? Or is it not an Oracle SQL thing, and instead is a SAS thing? Or is it available in all forms of SQL? Further, if it is SAS and/or Oracle