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Which SQL statement best implements the relations shown in this diagram?

Consider the Information Engineering diagram shown in the exhibit for a building management
company. Referential integrity must be maintained such that a building cannot be deleted when it
has residents. Building_ID, R_ID, Room_Count and Room_Num are integer numbers, whereas
Bldg_Name, Location and Res_Name are all represented by variable-length strings with a
maximum of 20 characters. Which SQL statement best implements the relations shown in this diagram?

Which is most likely reason than Sven received an error message?

Sven is a network administrator for a small network, and is
installing Microsoft Internet Information Server (IIS). As he is configuring the
default web server he leaves the default directory as wwwroot. Sven places a
document called index html in the directory, then tries to access the directory on a
web browser, but the server sends an error message. Which is most likely reason
than Sven received an error message?


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