Describe how to incrementally maintain the results of the following operationson both insertions and deletions: Left outer join.
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A: Question The statement SELECT * FROM T1, T2 produces a(n) ____ join.
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A: The Answer is
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A: Given:
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Q: Grace hash join is usually the best algorithm for joins in which the join condition includes an…
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Describe how to incrementally maintain the results of the following operations
on both insertions and deletions: Left outer join.
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Solved in 2 steps
- 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 FalseSQL: Create a SQL query that uses an uncorrelated subquery and no joins to display the descriptions for products provided by a vendor in area code 615. Remember, the main difference between a correlated subquery and uncorrelated subquery is that, in a correlated subquery, the inner query is dependent upon the outer query, while, with an uncorrelated query, the inner query does not depend upon the outer query. Instead, it runs just once. You should NOT use union, minus, or intersect in this query. The outer query will use the PRODUCT table and the inner query will use the VENDOR table [hint: you should have 9 records of output]. My code: select p_descript from product where (select v_areacode from vendor where v_areacode = '615' ; I am getting this error, problem is I can't see what is missing any assistance is appreciated. ORA-00936: missing expressionWrite a note on Joins with detailed examples.
- What is the difference between natural join and self join?Suppose a qüery sumServ sums the quantities in the CustomerBillitem table and a query sumWaste sums the quantities in the FoodWaste table. For the purpose of summing the quantities in sumServ and sumWaste, the following query design needs: sumserv sunWaste Storeio Storeib FoodiD Foodio Sumoruantity SumorQuantity sen wastew 1) No join from servWk to wasteWk 2) A left outer join on FoodiD 31 Left outer joins on StorelD and FoodID 4) All left outer joinsRewrite the queryselect *from section natural join classroomwithout using a natural join but instead using an inner join with a using condition.
- 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…Why are the NATURAL JOIN keywords not available for generating a self-join?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…