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Repeat Exercise 16.3.3, but allow the sub query to be corollated with R. For simplicity, you may assume that the subquery has the simple form of select-from-where expression described in this section, with no further subqueries.
Exercise 16.3.3
Give a rule for converting each of the following forms of to relational algebra. All conditions may be assumed to be applied (by a two-argument selection) to a relation R. You may assume that thesubquery is not correlated with R. Be careful that you do not introduce or eliminate duplicates in opposition to the formal definition of SQL.
a) A condition of the form EXISTS ().
b) A condition of the form a - ANY , where a is an attribute of R.
c) A condition of the form a - ALL , where a is an attribute of R.
Each thread tries to insert its elements into the tree by using a single lock associated with the tree. Show that the single lock becomes a bottleneck even for a moderate number of threads.
What is the probability that the game goes into overtime?
Suppose resource manager cell RM1 departs from S2 to H1 reporting a high available rate, but right afterward an RM cell arrives at S2 from H2 reporting a low available rate for the second half of the circuit. What problem might S2 now face?
Five articles within the past three years for applications of information security, within healthcare organizations.
While planning for a new project, a young developer mentions that she used Facebook as a collaborative group space for developing her senior project. She tells you that it was the ideal solution since it was free and all of her group members were ..
Think of a 2 country world, say the US and the UK. Each country produces two goods, say food and cloth. Suppose 7 hours of labour are required to produce one unit of either good in the UK, whereas in the US it takes 2 hours to produce one unit food a..
Make sure it is able to compile a program prog.c with pthread, do "gcc -lpthread -o prog prog.c" Need the: a) The code b) Screenshot of the terminal showing your program running with at least 8 (different) numbers as run-time input.
Find a review of a computer product online. Using the information in the review, write a task oriented set of instructions from the review. Be sure to include meaningful tasks and graphics. Use your book as a reference. Be sure to include the URL ..
Write a Program using Skip and Take operators. How can it beneficial for bulky data accessing on page?
What is the probability P[B > 500,000] that a fax has over 500,000 bits?
1. Based on an organization hierarchy, describe Five types of Information Systems that can support an organization 2. Describe the three attributes of quality information 3. Using an illustration, describe the Business Information Value Chain
Create a program with the following specifications: Reserve space in memory for an array of words of size 10. Use the '.space' directive. The array is called my array.
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