Consider the queryselect A, Bfrom rwhere r.B < some (select Bfrom swhere s.A = r.A)Show how to decorrelate this query using the multiset version of the semi joinoperation.
Q: What is the difference between the and DENSE RANK() functions? Pr RANK( ) an example.
A: The main difference between rank and dense_rank is as follows:
Q: Write a method named query2 that uses JDBC to execute a SELECT query to List, for a provided…
A: Actually, SQL stands for Structured Query Language.
Q: In table format, explain the distinction between hashset and treeset.
A: TreeSet HashSet In the collection hierarchy, TreeSet is a class for storing unique elements in…
Q: Consider the query:select *from r, swhere upper(r.A) = upper(s.A);where “upper” is a function that…
A: Consider the given query with upper function. It has been assumed that the before finding a plan…
Q: Implement the following ER model and sample data using Oracle SQL Developer and your CDM Oracle…
A: Below is the implementaiton of given ER model with CREATE statemetns: CREATE TABLE…
Q: Using explicit cursors write an anonymous block that displays the names of the shoppers followed by…
A:
Q: Explain how to break down the hybrid hash-join operator into sub-operators in order to mimic…
A: This question tells about break down the hybrid hash-join operator into sub-operators in order to…
Q: Suppose a qbery sumServ sums the quantities in the CustomerBilltem table and a query sumWaste sums…
A: Given two tables contains an entity each. The sumServ table is used to sum all the quantities in the…
Q: 1) Does proper indexing make it possible for some join queries to not need to retrieve a table entry…
A: “Since you have asked multiple question, we will solve the first question for you. If youwant any…
Q: There's a "friend_requests" table that has a column "action_taken" that displays if the friend…
A: SELECT Count(action_id) FROM friend_requests where action_taken = "Accepted"; This query will return…
Q: Produce a procedure to remove all linkedlist nodes with a duplicate key.
A: In a LinkedList, an algorithm to remove all nodes with a duplicate key. Example if the connected…
Q: Consider the following SQL Query: SELECT FNAME, DNAME FROM EMP AS E, DEPT AS D WHERE E.DNO =…
A: The SQL Tree finds the tree structure by resolving the query into sub parts and finding the tree…
Q: Consider tables S (A, B, C) and T (B, C, D) and SQL query select A, B, C, D from S, T where…
A: Answer: I have given answered in the handwritten format
Q: Define the difference between hashset and treeseet in table format.
A: Required: Define the difference between hashset and treeset in table format.
Q: What does an EXCEPT (MINUS) query care about operand order, while a UNION query doesn't?
A: EXCEPT and UNION are one of the set operators which are used to compare and retrieve result from two…
Q: Thus, persons are represented as pairs of integers: e = (birth, size), where the first number…
A: Describe how to expand the data structure of the skip list to respond effectively to the query: Max…
Q: When a SELECT operation WHERE clause is made up of several conditions connected with the OR operator…
A: In SQL, select query is used to fetch records from table. Where clause in select statement displays…
Q: Consider the following database: Students name rim sara milad tarek lastname age 19 18 21 18 Select…
A:
Q: There's a "friend_requests" table that has a column "action_taken" that displays if the friend…
A: Given Data : Table name : friend_requests Table attributes : action_id requester_id requestee_id…
Q: Map it to a query tree Provide a simplified WHERE clause
A: Normalization¯ manipulate query quantifiers and qualificationQ Analysis¯ detect and reject…
Q: Translate the following SQL query into MongoDB's query language: SELECT ChairName, Department FROM…
A: Assuming that we have a MongoDB collection named "Departments" with documents that have the…
Q: Try switching the joins pthread_join(tid2, NULL); pthread_join(tid1, NULL); Do you see any…
A: Mutex lосk will оnly be releаsed by the threаd whо lосked it. Sо this ensures thаt…
Q: Consider the query:select *from r, swhere upper(r.A) = upper(s.A);where “upper” is a function that…
A: Hash join: Hash-join itself is the type of joining techniques used for the processing of join…
Q: Suppose an application programmer was supposed to write a query select * from r natural left outer…
A: Consider the following values in the relation r. A B MARY 1 JOHN 2 SMITH 3 JONES 4…
Q: robingHashST and RedBlackBST, assess the usefulness of employing primitive types for Integer and…
A: In the realm of data structures, LinearProbingHashST (Linear Probing Hash Symbol Table) and…
Q: Items Table itemNo description MacBook Pro Lenovo PC 4GB Memory 500GB HD 342 345 346 em table and a…
A: Here we are using the right join so that can be defined as in such a way where the common rows…
Q: How does range partitioning perform in case of range query and point query? Compare it with…
A: Please upvote me please. I need it badly. Please upvote me Range partitioning strategy…
Q: Implement the following ER model and sample data using Oracle SQL Developer and your CDM Oracle…
A: This is the implementation of the given ER model: CREATE TABLE STUDENTS(StudentID NUMBER(5) PRIMARY…
Q: ion guest doesnt exist am i making a guess t
A: Consider the given SQL schema : Hotel (hotelNo, hotelName, city)Room (roomNo, hotelNo, type,…
Q: Develop a PL/SQL block that would go through all the employees from EMPLOYEES table who work in…
A: Solution SELECT * FROM departments where department_id =90; BULK COLLECT Clause for Selecting…
Q: split the hybrid hash-join operator into sub-operators to model pipelining
A: To split the hybrid hash-join operator into sub-operators to model pipelining
Q: 12. R 1. I 2 3 4 6 1 B 5 S BCD 2 + 6 6 8 47 9 Compute the result of the following query: SELECT R.A,…
A: Hello student Greetings Hope you are doing great. Thank You!!!
Q: Try switching the joins pthread_join(tid2, NULL); pthread_join(tid1, NULL); Do you see any…
A: Without Changing anything With changing pthread_join(tid2, NULL); pthread_join(tid1, NULL);…
Q: There's a "users" table that has more than 1M rows of "users" information. The image below are the…
A: There's a "users" table that has more than 1M rows of "users" information. The image below is the…
Q: SQL: Create a SQL query that uses an uncorrelated subquery and no joins to display the descriptions…
A: SQL queries are a set of instructions given to the database to retrieve specific data. SQL was…
Consider the query
select A, B
from r
where r.B < some (select B
from s
where s.A = r.A)
Show how to decorrelate this query using the multiset version of the semi join
operation.
Trending now
This is a popular solution!
Step by step
Solved in 2 steps
- There's a "friend_requests" table that has a column "action_taken" that displays if the friend request was rejected, requested, or accepted.Implement a SQL query to return the percentage of "action_taken" that were "accepted".Consider the query:select *from r, swhere upper(r.A) = upper(s.A);where “upper” is a function that returns its input argument with all lowercaseletters replaced by the corresponding uppercase letters. Some database systems would use a (block) nested-loop join for this query, which can be very inefficient. Briefly explain how hash-join or merge-join can be used for this query.Grace hash join is usually the best algorithm for joins in which the join condition includes an inequality (i.e. col1 < col2). Group of answer choices True False
- Define the difference between hashset and treeseet in table format.There's a "friend_requests" table that has a column "action_taken" that displays if the friend request was rejected, requested, or accepted.Implement a SQL query to return the number of "action_taken" that were "accepted".Building #11 is undergoing a major renovation. Implement a query to close allrequests from apartments in this building.
- Try switching the joins pthread_join(tid2, NULL); pthread_join(tid1, NULL); Do you see any difference? Please report if and why you do or do not see any difference in terms of the randomness in the result of the shared resource. In the inc_dec_resource() function, implement mutual exclusion (pthread_mutex_lock) to ensure that the result becomes 0 every time when you execute your program. Put your updated code in the report (highlighted) and show your screenshot of the execution by running the script three time using $ time ./shared_resource_mutex. Hint: Your loop is incrementing/decrementing the resource which should be protected by each thread while it is executing that portion. #include <stdio.h> #include <pthread.h> #define iterations 300000000 long long shared_resource = 0; pthread_mutex_t mutex = PTHREAD_MUTEX_INITIALIZER; // Thread function to modify shared resource void* inc_dec_resource(void* arg){ //get the pointer from main thread and dereference it…Try switching the joins pthread_join(tid2, NULL); pthread_join(tid1, NULL); Do you see any difference? Please report if and why you do or do not see any difference in terms of the randomness in the result of the shared resource. In the inc_dec_resource() function, implement mutual exclusion (pthread_mutex_lock) to ensure that the result becomes 0 every time when you execute your program. Put your updated code in the report (highlighted) and show your screenshot of the execution by running the script three time using $ time ./shared_resource_mutex. Hint: Your loop is incrementing/decrementing the resource which should be protected by each thread while it is executing that portion. /* Compile: gcc -o shared_resouce_mutex shared_resource_mutex.c -lpthread Execute: ./shared_resource_mutex */ #include <stdio.h> #include <pthread.h> #define iterations 300000000 long long shared_resource = 0; pthread_mutex_t mutex = PTHREAD_MUTEX_INITIALIZER; // Thread function to…Consider the query:select *from r, swhere upper(r.A) = upper(s.A);where “upper” is a function that returns its input argument with all lowercaseletters replaced by the corresponding uppercase letters. Find out what plan is generated for this query on the database system you use.
- Consider the following SQL Query: SELECT FNAME, DNAME FROM EMP AS E, DEPT AS D WHERE E.DNO = D.DNUMBER AND D.DNAME='CCI' AND SALARY > 15000; Draw the initial query tree for the above SQL query, and then show how the query tree is optimized by applying the Heuristic Rules. (You need to show the tree after applying a rule).Want hand written solutionHow does range partitioning perform in case of range query and point query? Compare it with round-robin partitioning.