Changing source file schemae and data definitions
Legacy system files often come without a schema or data definition embedded in the file, and if there is one, it might not be one that you are particularly happy with.
DDL and COB files are nothing more than a metadata description of a structure. The DDL for example may include label, datatype, length and whether the column is a primary key or nullable.
Data Studio will use the DDL or COB in a relatively simplistic way to manipulate the column labels. This is a fast and easy way to either add column identifiers or rename them.
CREATE TABLE employees ( id INTEGER PRIMARY KEY, first_name VARCHAR(50) not null, last_name VARCHAR(75) not null, fname VARCHAR(50) not null, dateofbirth DATE not null );
In this short clip I will show how I use a DDL for an SAP table (LFA1) to give the columns friendly descriptions instead of the more unfriendly technical column labels.