Definition: A view is a representation of a SQL statement that is stored in memory so that it can be re-used. A view is a logical entity or logical table that is essentially a SQL statement stored in the database in the system tablespace.
As it turns out, it's very likely that your Facebook and Twitter messages are better protected from government snoops than your phone texts, even when you send them from the same device.
Restrictions. Just as your tweets are visible only to those users who've followed you, it's only possible to send direct messages to the same pool of users. If you click the profile of someone who follows you, you'll notice the option to send that user a direct message appears under his or her name.If, on the other hand, you navigate to the profile of someone who doesn't follow your tweets -- even if you follow this person -- this option won't appear.estrictions. Just as your tweets are visible only to those users who've followed you, it's only possible to send direct messages to the same pool of users. If you click the profile of someone who follows you, you'll notice the option to send that user a direct message appears under his or her name.