List all flights departing from North Pole on December 24, 2005 (dataQ1.xquery); (2) Query the busiest airports (calculated departure and arrival flights) and the total number of incoming and outgoing flights (dataQ2.xquery) from December 2005 to 24; (3) List the airports (ignoring airports without passengers) and the total number of passengers in and out (dataQ3.xquery) according to the busy degree of airports (calculating the total number of passengers in and out) from December to 24, 2005; (4) Query the destination of all passengers named Santa Claus (dataQ4.xquery); In the above query plan, 3. It is relatively complex and needs to use some nested queries. If necessary, sub-queries can be written step by step. By debugging or executing the observation results, a complete query plan can be formed. Some nested queries can also be encapsulated as functions (sequence types need to be used to define functions) to increase the readability of the query plan.

Filename	Size	Update
dataQ2.xquery	499	2019-04-01
dataQ4.xquery	623	2019-03-28
dataQ1.xquery	68	2019-03-28
dataQ3.xquery	522	2019-03-28
Flights-Data.xml	14573	2012-11-05
__MACOSX	0	2019-04-19
__MACOSX\._Flights-Data.xml	243	2012-11-05

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