Database Systems: Design, Implementation, & Management
13th Edition
ISBN: 9781337627900
Author: Carlos Coronel, Steven Morris
Publisher: Cengage Learning
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Chapter 6, Problem 13RQ
Program Plan Intro
Normalization:
The process used to minimize data redundancy and dependency in a relational
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When an attribute is included in a composite primary key, it automatically becomes a candidate key for that table.
Assume you have a vehicle table with a surrogate key vehicle_id column and VIN (Vehicle Identification Number) column and some other columns. You want to designate a unique index on the vehicle_id and VIN columns because together they filter on the joining column with the highest cardinality (or degree of uniqueness). Write the syntax to add a unique index on the vehicle_id and VIN columns triggered by joins on the surrogate key column?
Write SQL code for the following design schema of three tables. The tables should have the following properties:
sales table has a primary key on SalesNumber and it is set to AUTO-INCREMENT.products table has a primary key on number and it is set to AUTO-INCREMENT, they is an unique index on prodidsalesdetails table has a primary key on number and it is set to AUTO-INCREMENT, they is an index on prodid. They is a one-to-many relationship between the salesdetails.SalesNumber andsales.SalesNumber fields. There is a one-to-many relationship between the products.prodid and salesdetails.prodid fields. There is to be a delete constraint on the product.prodid field a record in the product table should not be allowed to be deleted if they exist a matching prodid in the salesdetails table. Primary and foreign keys should be implemented in the appropriate tables. Referential Integrity should be enforce at the database level, where appropriate for example, if a sales record is deleted all…
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Database Systems: Design, Implementation, & Management
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- What three join types are included in the outer join classification?arrow_forwardUsing tables named T1 and T2, write a query example for each of the three join types you described in Question 2. Assume that T1 and T2 share a common column named Cl.arrow_forwardClosely examine the following tables and use it to answer the questions that follow: department course student_type student_category Student registration registration_type Suppose that the following are true: - all id column are primary keys in whichever table they are - the dept_id in course table is foreign key that is referencing the id column in the department table - the foreign keys stud_type_id, stud_cat_id in the student table are referencing the id columns in the student_type and student_category tables respectively. - the coursecode and stud_id columns in the registration table are foreign keys in the course and student tables respectively. 1. Design an Entity Relationship Diagram for the system above. 2. Write query that would return the names and contacts of all Local students. 3. Write a query that would return names, contact and locations of all departments that has a location text with Ave 3 as part of it. [hint: use the LIKE clause with “_” or “%”] 4. What would…arrow_forward
- Hi, For this proble I need to create a table called instructor_course_nums within a university database schema. 1. I need to write a procedure that accepts an instructor ID as input. The procedure calculates the total number of course sections taught by that instructor, and adds a tuple to the instructor_course_nums table consisting of the instructors ID number, name, and total courses taught - call these attributes: ID, name, and tot_courses. 2. If the instructor already has an entry in the table, then the procedure makes sure the total number of courses taught in the instructor_course_nums table is up-to-date. Here is what I have that answers the first part of the question: CREATE TABLE instructor_course_nums ( id varchar (10), name varchar (30), tot_courses integer, CONSTRAINT instructor_course_nums_pkey PRIMARY KEY (id)); CREATE OR REPLACE PROCEDURE Student_00_insCourseNumsProc(ID varchar(10), name varchar (25), tot_courses…arrow_forwardCan a composite attribute be part of a composite keyarrow_forwardWhat data types would you use for the attributes in this entity? How would you code a CREATE TABLE statement to implement this entity as a table in the database?arrow_forward
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