You are attempting to gather information about a client's network, and are surveying a company site. Access is gained via secure
d entry using ID cards. You observe several employees on a smoke break near once of the secured entrances. Once they are finished, you casually follow them in after they've unlocked the entry point with an ID card. What type of social engineering attack has occurred
Tailgating refers basically to an attacker seeking entry to a restricted area, where access is unattended or controlled by electronic access control. He/she can simply walk in behind a person who has legitimate access.
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Correlated subquery :These sub queries reference columns from outer table or uses values from outer query.These sub queries are processed atleast once for every row processed.So because of this reason correlated sub queries can be slow.Since the query in the question also uses value from the outer query so it is a correlated query.
