Question 8 5 points Consider a university database storing details about venues (i.e, lecture the-atres, labs and classrooms) and their capacity (number of students that can fitinto the venue): these details are stored in a table Venue(vName, capacity).Which of the following three SQLite queries will produce the name and capacityof the venue (or venues, if there is more than one) that have the greatestcapacity? # Query 1SELECT VName，capacityFROM VenueWHERE capacity = (SELECT MAX(capacity) FROM Venue); # Query 2SELECT VName，MAX(capacity) FROM Venue; # Query 3SELECT V.vName,V.capacity FROM Venue V WHERE NOT EXISTS (SELECT * FROM Venue V2 WHERE V2.capacity > V.capacity); New chat四 List Stores by Bool Yesterday Sprint Meeting Plar Newchat SharePoint Integrat Write Meeting Agen Market Size Analysi Assigning Studentsi 口 找到员工最多的组织 Install PyTorch Succe Previous 7 Day: [email protected] O 1.Query 1 and Query 2 only O 2.None of them O 3. Query 2 and Query 3 onlyO 4. Query 1 and Query 3 only O 5.All of them Moving to another
Question
Question 8 5 points Consider a university database storing details about venues (i.e, lecture the-atres, labs and classrooms) and their capacity (number of students that can fitinto the venue): these details are stored in a table Venue(vName, capacity).Which of the following three SQLite queries will produce the name and capacityof the venue (or venues, if there is more than one) that have the greatestcapacity?
Query 1SELECT VName，capacityFROM VenueWHERE capacity = (SELECT MAX(capacity)
FROM Venue);
Query 2SELECT VName，MAX(capacity)
FROM Venue;
Query 3SELECT V.vName,V.capacity
FROM Venue V WHERE NOT EXISTS (SELECT * FROM Venue V2 WHERE V2.capacity > V.capacity); New chat四 List Stores by Bool Yesterday Sprint Meeting Plar Newchat SharePoint Integrat Write Meeting Agen Market Size Analysi Assigning Studentsi 口 找到员工最多的组织 Install PyTorch Succe Previous 7 Day: [email protected] O 1.Query 1 and Query 2 only O 2.None of them O 3. Query 2 and Query 3 onlyO 4. Query 1 and Query 3 only O 5.All of them Moving to another
Solution
The correct answer is 4. Query 1 and Query 3 only.
Explanation:
Query 1: This query first finds the maximum capacity from the Venue table and then selects the venue(s) with that capacity. This will correctly return the venue(s) with the greatest capacity.
Query 2: This query is incorrect because the MAX function in SQLite returns the maximum value of the selected column but it doesn't guarantee that the other column (vName) will correspond to the row with the maximum capacity. So, it might return the wrong venue name.
Query 3: This query selects the venue(s) for which there is no other venue with a greater capacity. This will correctly return the venue(s) with the greatest capacity.
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