Database Concepts (7th Edition)
7th Edition
ISBN: 9780133544626
Author: David M. Kroenke, David J. Auer
Publisher: PEARSON
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Textbook Question
Chapter 5, Problem 5.35RQ
Code an SQL statement that creates a table with all columns from the parent and child tables in your answer to question 5.34. Code an SQL statement using a left outer join that creates a table with all columns from the parent and child tables. Explain the difference between these two SQL statements.
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can you help me iwth these two queries in mySQL.
Write a SQL statement to create a table job_history including columns employee_id, start_date, end_date, job_id and department_id and make sure that, the employee_id column does not contain any duplicate value at the time of insertion and the foreign key column job_id contain only those values which are exists in the jobs table.
Write a SQL statement to create a table employees including columns employee_id, first_name, last_name, email, phone_number hire_date, job_id, salary, commission, manager_id and department_id and make sure that, the employee_id column does not contain any duplicate value at the time of insertion and the foreign key columns combined by department_id and manager_id columns contain only those unique combination values, which combinations are exists in the departments table.
1. What is structured query language and how is it used?2. What is a primary key?3. What is a foreign key?4. Why would you need to join two tables?5. What is the difference between a one-to-one and a one-to-many relationship? Can you join 2 tables to create a many-to-many relationship?6. Write a SQL statement which does the following:a. Creates a new table with 3 fields: Firstname, Lastname, PID. b. Make PID the primary keyc. Why might this table contain a foreign key?7. Write an SQL statement for the above table that would find all people with the last name “Sweeney” and sort the results alphabetically by last name & first name.
9. What is the difference between DDL and DML?
You are given the schema of a table with its columns inside the bracket as follows:
STUDENT(Name, Student_id, Major, Marks, Email)
(The Primary Key is underlined)
Write an SQL query for the following tasks: (Hint: the queries are nested)
1. Write an SQL query to retrieve the name, student id and the maximum marks of students of each major where that maximum marks is greater than all students with CS major.
2. Write an SQL query to retrieve the name, student id and the maximum marks of students with ECE major where that maximum marks is greater than all students with CS major.
Chapter 5 Solutions
Database Concepts (7th Edition)
Ch. 5 - Explain how entities are transformed into tables.Ch. 5 - Prob. 5.2RQCh. 5 - Prob. 5.3RQCh. 5 - What is denormalization?Ch. 5 - Prob. 5.5RQCh. 5 - Explain the problems that denormalized tables may...Ch. 5 - Explain how the representation of weak entities...Ch. 5 - Explain how supertype and subtype entities are...Ch. 5 - Prob. 5.9RQCh. 5 - Prob. 5.10RQ
Ch. 5 - Show two different ways to represent the 1:1...Ch. 5 - Prob. 5.12RQCh. 5 - Prob. 5.13RQCh. 5 - Prob. 5.14RQCh. 5 - Prob. 5.15RQCh. 5 - Prob. 5.16RQCh. 5 - For your answer to question 5.15, code an SQL...Ch. 5 - Prob. 5.18RQCh. 5 - Prob. 5.20RQCh. 5 - Prob. 5.21RQCh. 5 - Explain how the terms parent table and child table...Ch. 5 - For your answers to questions 5.20, 5.21, and...Ch. 5 - Prob. 5.24RQCh. 5 - Prob. 5.25RQCh. 5 - Prob. 5.26RQCh. 5 - Prob. 5.27RQCh. 5 - Prob. 5.28RQCh. 5 - Define the three types of recursive binary...Ch. 5 - Prob. 5.30RQCh. 5 - Prob. 5.31RQCh. 5 - Prob. 5.32RQCh. 5 - Prob. 5.33RQCh. 5 - Prob. 5.34RQCh. 5 - Code an SQL statement that creates a table with...
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- How is the processing of SQL DDL statements (such as CREATE TABLE) different from the processing required by DML statements?arrow_forwardQuestion 1 Write SQL statements to answer questions 1.1, 1.2, 1.3 and 1.4 based on the following schema. Primary keys are( BOLD and italicized) and attributes with the same names in different tables are foreign keys. Doctors(doctorId, doctorLastName, doctorFirstName,specialtyID, numberOfPatientsSeen) Patients(patientId, patientLastName, patientFirstName, sex, patientBalance, numberOfVisits, patientDateOfBirth ) Records(doctorId, patientId, date, diagnosis, visitCost) Specialty(specialtyId, specialtyName, specialtyCost) 1.1) Create a view, called PatientSmithDoctors, to list all the doctors a patient with the last name of Smith has seen (be careful on this one). 1.2) Write a trigger, each time a row is inserted in the table Records, the numberOfVisits in the corresponding Patient row is updated by 1 (i.e. add 1 to the numberOfVisits) and the numberOfPatientsSeen in the Doctors table is also updated by 1. 1.3) Find the Patient’s full name with the…arrow_forwardConsider a scenario in which the SQL statement is of the form SELECT DISTINCT c1, c2, c3 from T. Why might it make sense to create an index to optimize this query?arrow_forward
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