Sarita, can you be more specific on what external database you are connecting to? We have a JDBC extension, and you should be able to connect to any external database as long as you have the required jar(s) and connection information/ strings.
I have stored my data in Thingworx database. I have created one thing as a database and stored data in it, now i want to send that data to a webpage which is not connected to thingworx, i mean to say i want to display my stored data in thingworx to a page outside of thingworx for which we don't need thingworx account
Your external application can send a GET request, which will return all properties from YourThing (as a JSON for exemple).
Then, parse the response to use it as you want on your page.
You don't need a thingworx user account if you put the thingworx appkey in your request header.
If you want, you can try it with RESTclient (Add-on for Firefox), to check.