Introduction to SQL Notification Services
Most methods of obtaining information from a computer involve making an explicit request for that information. Requesting information might mean querying a database, browsing a Web site, or reading information from an Internet newsgroup.
Asking for information works when you know what information to ask for, you remember to ask for it at the appropriate time, and you have access to a computer or other device that can connect you to the appropriate information source. But there are some important cases in everyday life where explicitly asking for information is inconvenient or impossible.
Imagine that you have to meet someone arriving at the airport. Knowing that flights sometimes arrive earlier or later ...
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