Do not know how to start my question, Is there any text file based database? I am not a programmer nor a database developer. The only "program language" I'm using now is Matlab. Matlab has a database toolbox/interface. As my understanding, it works with standerd SQL. I do not have too much data, upto thousands items and could be multiple tables later. Only myself access to it. I want keep them in text format, coz it is sample, I can access then even without dbtool. I want it has a db structure a