Create a temporary table for V1 b) Create the appropriate trigger(s) on R that will keep V1 current on inserts and deletes c) Provide sufficient test cases to demonstrate the correctness of your solution.
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One implementation technique of a view is as a temporary table. That creates the challenge for the system to keep the temporary table up-to-date as modifications are done in the base table(s). Consider this example: create table R (a int, b int, primary key(a,b)); create view V1 as select A+B as S, A-B as D from R where A between 1 and 10;
a) Create a temporary table for V1
b) Create the appropriate trigger(s) on R that will keep V1 current on inserts and deletes
c) Provide sufficient test cases to demonstrate the correctness of your solution.
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- Assume that the sole reference in the definition of the view v is the relation r. Is it necessary for a user who has been given update permissions on v to also have update permissions on r? What's the point?Using the WideWorldDistributors database and the Sales schema create a function that takes InvoiceID as an input parameter and returns all the rows from the table InvoiceLines for the InvoiceID value passed into the function. If the result is a NULL return a zeroCreate a view of the Join of Deposit and Withdraw transactions to Bank Branch UNION with the join of Bill Payment and Debit Purchase, or Return transactions to Merchant (i.e., all transactions with appropriate reference name.). BranchNbr stores RefNbr of either 'D', OR 'W' transactions, and MerchantNbr stores RefNbr of either 'B', 'P' or 'R' transactions. Provide an alphabetic list by last name of all Clients showing their full name (e.g., Bob Barlow), with the number of Accounts they hold and the total balance of those Accounts Provide a count and total amount of Transactions for each Type Description PLEASE DONT NOT COPY THE EXISTING SOLUTION ON BARTLEBY IT IS WRONG AND DOES NOT WORK AND IS INCOMPLETE. GIVEN THE BELOW: --THIS CREATES THE BANK BRANCH TABLE: CREATE TABLE BankBranch ( BranchNbr INT PRIMARY KEY, BranchName VARCHAR(250)); --THIS CREATES THE MERCHANT TABLE: CREATE TABLE Merchant ( MerchantNbr INT PRIMARY KEY, MerchantName VARCHAR(250)); --THIS…
- Create a view of the Join of Deposit and Withdraw transactions to Bank Branch UNION with the join of Bill Payment and Debit Purchase, or Return transactions to Merchant (i.e., all transactions with appropriate reference name.). BranchNbr stores RefNbr of either 'D', OR 'W' transactions, and MerchantNbr stores RefNbr of either 'B', 'P' or 'R' transactions. Provide an alphabetic list by last name of all Clients showing their full name (e.g., Bob Barlow), with the number of Accounts they hold and the total balance of those Accounts Provide a count and total amount of Transactions for each Type Description PLEASE DONT NOT COPY THE EXISTING SOLUTION ON BARTLEBY IT IS DOES NOT WORK AND IS INCOMPLETE. GIVEN THE BELOW: --THIS CREATES THE BANK BRANCH TABLE: CREATE TABLE BankBranch ( BranchNbr INT PRIMARY KEY, BranchName VARCHAR(250)); --THIS CREATES THE MERCHANT TABLE: CREATE TABLE Merchant ( MerchantNbr INT PRIMARY KEY, MerchantName VARCHAR(250)); --THIS CREATES THE…Assume the relation r is the only reference in the view v definition. Is it required that a user with update rights on v also has update permissions on r? So what?The following query is written in relational algebra.Project[Deposit.aid,Deposit.amount](Select[Deposit.amount>=10000]( Join[aid=aid](Account,Deposit)))Our database system includes the implementation of B+ tree indexes solely. Assume wehave indexes on primary keys of tables and an index on Deposit.amount.Which join algorithm reads less number of pages from the disk: sort-merge join or indexnested loops join?
- Give Pros of Using Dynamic ViewsWhat* is a new table operation can you think of, that won't break closure? *What* about a new operation that does break closure? Your operations don't need to be useful in practice, but, they could be :) Note - changing column names/types, adding or deleting columns or rows are not considered table operations, as you know [so those can't be your answers :)] - other than that, you can come up with ANY operations!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.
- You will need to create the database tables and choose sensible data types for each column.Make sure to maintain entity and referential integrity, and implement all the above constraints.Since other developers work in parallel on other parts of the system, you will need to strictly follow the above specification to correctly implemented in your database. Otherwise, the other software will not be able to use your database. This means, one needs to be able to rely on all constraints being correct, the spelling of table and column names being as given, and that the data types that you chose will allow for sensible data to be added to the database in the future.For testing purposes, you are asked to insert the data specified below into the tables, but no other data except this.In short:1. You will need to create the tables as specified2. You will need to add the data specified Please use the 3.sql and implement your tables using the sketched CREATE TABLE commands. Add the necessary queries…WRITE THE CODE OF MYSQL IN PYTHON Create database and tables as given below by using Python. (a) Market database (b) Vendor: vendor_id integer, vendor_name varchar, license_start date, license_end date (c) Item: item_id integer, item_name varchar, item_type varchar, previous_price float, last_sold_date date (d) Auction: auction_id integer, vendor_id integer, item_id integer, price float Choose primary and foreign keys depending on the relations in Market database design.1. Use appropriate clauses and filters to run the query with minimum time complexity. 2. Try to avoid running the queries on unnecessary rows and columns. 3. Share the queries along with a brief description of the code in a python file, so that the results are reproducible. Q1: Write a query to find the students working in a company having more ratings than their seniors EMPLOYEES RATING TABLE student id student name rating senior id designation 1 george 9 3 student 2 micheal 8 4 student 3 mary 6 null senior 4 steve 9 null senior For the above table GEORGE has more rating than his sENIOR