A database is a structure that is used to hold data and it referred as a systematic collection of data.
Table:
A table is a logical structure that represents an entity state. It is one of the components of database.
One to Many Relationship:
When one record in a database table is associated with more than one record in another table, the relationship between the two tables is referred as one to many relationship. It is also represented as1: M relationship. This is the opposite of many to one relationship.
CROW FOOT ERD:
The Crow Foot ERD is an Entity Relationship Diagram which is used to represent the cardinalities present in the basic ER diagram. It is used to represent the relationships present between two tuples or tables present in the database.
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Chapter 3 Solutions
Database Systems: Design, Implementation, & Management
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- Consider the relational database tables below and write the relational algebra expression for the following questions. [stdid is studentid, bid is bookid, rdate is reserved date and adate is accessed date] Student (stdid, semester, major, name, score, age) Books (bid, bname, author) Reserve (stdid, bid, rdate) Accessed (stdid, bid, adate) 1. Find out the details of all students who have score greater than or equal to 70. 2. Find the students who belong to 'CSE' major and whose score is greater than 60. 3. Find the name, score of students who belong to 'EC' major and whose score is greater than 50. 4. Find the stdid of students who have accessed and reserved a book. 5. Find the stdid of students who have accessed but not reserved a book. 6. Find the names of students who have reserved a book using natural join.arrow_forwardFor the purpose of illustrating the structure of a database, either an E-R diagram or DBDL may be used. If that's the case, which strategy do you favor, and why?arrow_forwardIn a relational database, the size of a table may be reduced via a select operation by eliminating columns from the table that meet a set of predefined requirements.Is there a mistake in my understanding of this?arrow_forward
- Scenario: The owner of Al Musana Hotel would like to have a database tables that will help him manage the clients and rooms in his building. He wants to record the information about his clients and its occupancy. The hotel has three different room types which are available for daily rent only. As the Database Designer, perform the following tasks to help the owner of the hotel: Create the CLIENTS table using the specification below: Table Name: CLIENTS Field Name/ Data Type column name Size Constraints CID Number 8 PRIMARY KEY CName Varchar2 25 NOT NULL Validate to accept Male or Female only Gender Varchar2 10 Address Varchar2 25 Contact Number 15 Стуре Varchar2 15arrow_forwardWRITE 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.arrow_forwardNormalization works through a series of stages called normal forms. For most purposes in business database design, the normalization process. stages are as high as you need to go in five two four threearrow_forward
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