The cost to create such software depends on whether you will write it yourself or not. If you can, it won't cost anything but your time. If you have to hire programmers, it can cost thousands just for
First, what platform are you working in? Some database management platforms have tools to determine Object Dependencies. Much of the info you ask fo is simply a matter of reading the SQL statement for
You could run your own server locally that is accessible from the Internet, but I don't recommend that. The other option is to replicate the database from your web host to a local server. A lot depends
POS software is basically a database application. You are recording your sales as transactions in the database. You can certainly build your own using any database development platform. Microsoft
Hi Vitaly, ETL is used to extract, transform and load data from various database systems. You can check various Data Warehousing products/tools on this links - http://en.wikipedia.org/wiki/Category:ETL_tools

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