ALTER
The ALTER statement allows you to modify a resource.
General format
EXEC SQL [ AT Database ]
 
  ALTER Options
 
END-EXEC
Syntax rules
1. Options is passed to the driver without further checks. Refer to the database documentation for detailed syntax. Syntax errors, if any, are returned at runtime.
General Rules
1. Database identifies the active connection that will execute the query and must be previously defined using a Format 4 DECLARE statement.
Examples
Alter a table to add its primary key
exec sql 
   alter table customers add primary key (cust_code)
end-exec