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Well it reallyd epends a lot on what database you're using for starters, then what coding languages and what software or hosting framework you're using.
For example, if you use Microsoft SQL Server, the database engine itself is able to make HTTP calls, so you could set up a trigger to issue a ping every time the data in the table changed. MySQL I'm almost sure cannot do HTTP, so it would be impossible for the database to notify other web sites directly. You might set the web page that hosts whatever form you use to enter the data to do the pingback on submit.
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