A sequence of relational algebra operations forms a
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- branch(branch name, branch city, assets) customer (customer name, customer street, customer city) loan (loan number, branch name, amount) borrower (customer name, loan number) account (account number, branch name, balance) depositor (customer name, account number) Give an expression in the relational algebra for each of the following queries: Find all loan numbers with a loan value greater than $50,000. b. Find the names of all depositors who have an account with a value greater than $9,000. Find the names of all depositors who have an account with a value greater than $8,000 at the “Uptown” branch.Doctor (SSN, FirstName, LastName, Specialty, Years0fExperience, PhoneNum) Patient(SSN, FirstName, LastName, Address, DOB, PrimaryDoctor_SSN) Medicine(TradeName, UnitPrice, GenericFlag) Prescription(Id, Date, Doctor_SSN, Patient_SSN) Prescription Medicine(Prescription Id, TradeName, NumofUnits) a. Write a relational algebra expression to list patient's first name, patient's last name, and primary doctor's first name of all patients. b. Write a relational algebra expression to list all the prescriptions given by each doctor. Select TradeName, doctor's first name. c. Write a relational algebra expression to list the first and last name of patients who have no prescriptions written by doctors other than their primary doctors. d. Write SQL statement to retrieve the number of patients that each doctor has written prescriptions for. You must displav the doctor's first name along with the number of prescriptions he/she wrote. e. Write the DDL (SQL) statement to create Prescription_Medicine…1. Differentiate between Chained and Nested Relational operation with example. 2. Differentiate between While and do-while with example
- what are the sixteen constraintsse SQL program Server2014 ... A company undertakes a number of projects, the employees work on it, and during the process of analyzing the system we found the following points: The company is made up of a number of departments (the department number, which is a single number, the name of the department, the department's website) There are employees (the employee's number is a single number, his name, address, salary, and job) The employee belongs to one department only, and each department has more than one employee. There are projects (the project number, which is a single number, the name of the project, the project site) Each project has a specific department that it manages, and the department may manage it more than one project. More than one employee works in the project, and the employee may work in more than one project. Each employee has a number of work hours per week in each project. Required: 4. Create a Trigger that indicates the end of the entry operation on any of…database development write a function and funcation call program in PL/SQL to sum the even integers between 1 and any number that is passed as a parameter in a function
- relation: Book (BookID, Author, ISBN, Title) Write a PL/SQL block of code that performs the following tasks: Read a Book id provided by user at run time and store it in a variable. Fetch the Author and title of the book having the entered id and store them inside two variables Display the fetched book author and title.The order of operands is important for EXCEPT (MINUS) searches, but not for UNION queries.Normalization should be defined.
- python - Write the syntax for obtaining the index where X == 0.In what ways can you examine relationships between numeric values if you have relational operators on hand?Database (Transaction Management) Each branch of the Jaja restaurant has a mainstay menu that is very popular with customers, so information on the availability of the number of servings is needed to be able to serve orders. Here are two transactions that are ordering a food menu at the same time. T1: Start the transaction at time t1, read 10 servings of food stock at t2. Because ordering one portion, the stock is reduced by 1 at t3. On t6, update the stock count, and commit to t7. T2: Transaction T2 starts a transaction on t2, reads the number of stocks in t3 as many as 10. At t4 orders 3 portions. On t5 it updates the stock to 7 and then on t6 commits it. As a result of the T1 and T2 transactions above, there was an error in the amount of food stocks. Make a solution with 2PL. What kinds of problems happened? Give a reason why choosing this type of problem! How much food is still available?
