Repeats a statement for each primary key column in a table.
In a trigger for the table TITLEAUTHOR, the following macro:
message .PKCOLN("'%COLUMN% is a primary key column'","",",",";")
generates the following trigger script:
message 'AU_ID is a primary key column', 'TITLE_ISBN is a primary key column';
For columns, the macro PKCOLN only accepts the variable %COLUMN%.