Host sqlserver Online ?

You can make it two ways. 1. On-Premise 2. Cloud server

 

1. On-premise: You can host your Database in your own server and it can be accessed through internet. But it must have public IP address.

 

2. Cloud server: You can host your Database in in Cloud means third party tool but it is not free of cost. Try Microsoft Azure (SQL Azure), Google SQL Cloud, ClusterPoint(https://www.clusterpoint.com/pricing)