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SQL provides an n-ary operation called coalesce, which is defined as follows: coalesce(A1, A2,..., An) returns the first nonnull Ai in the list A1, A2,..., An, and returns null if all of A1, A2,..., An are null.
Let a and b be relations with the schemas A(name, address, title), and B(name, address, salary), respectively. Show how to express a natural full outer join b using the full outer-join operation with an on condition and the coalesce operation. Make sure that the result relation does not contain two copies of the attributes name and address, and that the solution is correct even if some tuples in a and b have null values for attributes name or address.
If A
Why is a highly coupled module difficult to unit test?
It takes 1 nsec to access a word from the cache, 10 nsec to access a word from the RAM, and 10 ms to access a word from the disk. If the cache hit rate is 95% and main memory hit rate (after a cache miss) is 99%, what is the average time to access..
How does a database system generate XML document from database data? What is the importance of the order of tables in a SQL statement that uses FOR XML? (at least 200 words)
Troubleshooting RIP and EIGRP vLab
What transport protocols
Analyze why understanding the difference between both roles is important when designing and programming an application?
Show how to implement all three operations so that the sequence of M operations takes O(M log N/log log N) time.
Write a mycopy program that shall copy a file from the program's standard input (stdin) to its standard output (stdout). You are allowed to use only the functions open/read/write/close for I/O: no other I/O functions (such as fprintf, printf, fscanf,..
Author recommends ways to do this. Describe potential challenge that this type of collaboration might face and explain way of dealing with it.
What can be the B2B e-commerce in any organization/workplace/etc?
Both firewalls and intrusion detection systems are used to monitor network traffic and implement network security policies. Research these technologies and determine how they are similar and how they differ. Are both needed? Explain your answer in..
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