
Concept explainers
(a)
Definition of Base Table.

Explanation of Solution
Base table in relational data model stores the raw data and correspond to the relations that are identified in the conceptual schema of the
(b)
Definition of Data Definition Language

Explanation of Solution
Data Definition language (DDL) is a computer language which consists of various command used for creating and modifying databases and schemas. The commonly used DDL commands are CREATE, ALTER and DROP.
- CREATE command is used to create a new table with the following syntax
- ALTER command is used to modify the existing table. The syntax is:
- DROP command is used to delete a table. The syntax is:
Create table Table name (Column definitions).
Alter table Table name add new column.
Drop table Table name
(c)
Definition of Data Manipulation language.

Explanation of Solution
Data Manipulation Language is a computer language used to modify the data in the databases. The most commonly used data manipulation commands are INSERT, DELETE and UPDATE.
- INSERT command is used to add records in the database. The syntax for INSERT command is:
- DELETE command is used to delete records from the table according to the condition. Syntax is:
- UPDATE command is used to update the records in the database. Syntax is:
Insert into table Table name(columns) values(values)
Delete from table Table name where(condition)
Update Table name set (column = value) where(condition)
(d)
Definition of Dynamic view.

Explanation of Solution
Dynamic view is a kind of virtual table that is created as per request of user dynamically. Dynamic view cannot be considered as a temporary table. In fact, the definition of dynamic view is stored in the system catalog and as a result of SQL query, the content of the view is materialized.
(e)
Definition of Materialized view

Explanation of Solution
Materialized view is different from Dynamic view. Here replicas and copies of data are created on the basis of SQL queries in the same manner as that of Dynamic views. Materialized views are stored physically on the disk.
(f)
Definition of referential integrity constraint.

Explanation of Solution
Refential Integrity constraint is the concept used in relational database which ensures that the tables in the database are in consitent state. This statement means that if there is any foreign key used in the database, it must be in agreement with the primary key which is referenced from that foreign key. Any changes in primary key must be updated in the foreign key also.
(g)
Definition of Relational DBMS

Explanation of Solution
Relational Database Management System (RDBMS) is a type of DBMS which is used for the data stored in relational databases in the form of tables(combunation of rows and columns). RDBMS is manily used to store the data related to manufacturing, finance, logistic and other applications. It uses SQL commands to access the daatbases.
(h)
Definition of Schema.

Explanation of Solution
Schema is a structure or architecture of the database which is supported by the DBMS. It is considered as the blueprint of how the database is constructed. The schema is stored in the data dictionary generally by the database. It defines the objects in the databases.
(i)
Definition of Virtual Table.

Explanation of Solution
Virtual table is constructed automatically as per the need of the DBMS and are not maintained as real data.
Want to see more full solutions like this?
Chapter 6 Solutions
Modern Database Management (12th Edition)
- 3) Find CFGs that for these regular languages over the alphabet Σ= {a, b}. Draw a Finite Automata e CFG. 1 COIS-3050H-R-W01-2025WI-COMB Formal anguages & Automata Is that contain the substring aba. (b) The language of all words that have an odd number letters and contains the string bb. (c) The language of all words that begin with the substring ba and contains an odd number of letters. 4) Convert the following FA into a PDA. a a S± b a a Ν Ꮓarrow_forwardCOIS-3050H-R-W01-2025WI-COMB Formal ministic PDA. Are the following words accepted by this Languages & Automata UI MIUSɩ that aTU I ed, indicate which state the PDA is in when the crash occurs. (a) aabbaa (b) aaabab (c) bababa Start (d) aaaabb A Accept Read₁ Push a (e) aaaaaa a b Read, Popi a a,b A Read₂ Accept A Pop₂arrow_forward5) Eliminate the A-productions from the following CFG: Abc COIS-3050H-R-W01-2025WI-COMB Formal Languages & Automata BAabC C CaA | Bc | A 6) Convert the following CFG into CNF. S→ XYZ XaXbS | a |A YSbS | X | bb Z→ barrow_forward
- Need help answering these questions!1. Design a While loop that lets the user enter a number. The number should be multiplied by 10, and the result stored in a variable named product. The loop should iterate as long as the product contains a value less than 100. 2. Design a For loop that displays the following set of numbers: 0, 10, 20, 30, 40, 50 . . . 1000 3. Convert the While loop in the following code to a Do-While loop: Declare Integer x = 1 While x > 0 Display "Enter a number." Input x End Whilearrow_forwardNeed help with these:Design a While loop that lets the user enter a number. The number should be multiplied by 10, and the result stored in a variable named product. The loop should iterate as long as the product contains a value less than 100. 2. Design a For loop that displays the following set of numbers: 0, 10, 20, 30, 40, 50 . . . 1000 3. Convert the While loop in the following code to a Do-While loop: Declare Integer x = 1 While x > 0 Display "Enter a number." Input x End Whilearrow_forwardConvert the While loop in the following code to a Do-While loop: Declare Integer x = 1 While x > 0 Display "Enter a number." Input x End Whilearrow_forward
- Python - need help creating a python program that will sum the digits of a number entered by the user. For example if the user inputs the value 243 the program will output 9 because 2 + 4 + 3 = 9. The program should ask for a single integer from the user, it should then calculate the sum of all the digits of that number and output the result.arrow_forwardI need help with this in Python (with flowchart): Im creating a reverse guessing game. Then to choose a random number from 1 to 100 and the computer program will attempt to guess it, displaying the directions calculated or not. The guess will be displayed and the user will answer if it was correct or not. If correct, the game ends, if not then the computer asks if the guess was too high or too low. Finally inputting an answer and the computer generates a new guess within the proper range. Oh and to make sure the program doesnt guess outside of the ranges produced by the inputs of “too high” and “too low”. The program ending when the user guesses correctly or after the program takes 6 guesses. HELP ASAP!arrow_forwardI need help with this in Python (with flowchart): Im creating a reverse guessing game. Then to choose a random number from 1 to 100 and the computer program will attempt to guess it, displaying the directions calculated or not. The guess will be displayed and the user will answer if it was correct or not. If correct, the game ends, if not then the computer asks if the guess was too high or too low. Finally inputting an answer and the computer generates a new guess within the proper range. Oh and to make sure the program doesnt guess outside of the ranges produced by the inputs of “too high” and “too low”. The program ending when the user guesses correctly or after the program takes 6 guesses. HELP ASAP!arrow_forward
- Need help finding errors in my pseudocode (Two)! Declare Boolean finished = False Declare Integer value, cube While NOT finished Display "Enter a value to be cubed." Input value; Set cube = value^3 Display value, " cubed is ", cube End While Next, I intended the following pseudocode to display the numbers 1 through 60, and then display the message "Time’s up!". Doesnt work and has error. Declare Integer counter = 1 Const Integer TIME_LIMIT = 60 While counter < TIME_LIMIT Display counter Set counter = counter + 1 End While Display "Time's up!"arrow_forwardHaving error in pseudcode; wanting to get five sets of two numbers each, calculate the sum of each set, and calculate the sum of all the numbers entered. Not functioning as intended and can't find the error.Code: // This program calculates the sum of five sets of two numbers. Declare Integer number, sum, total Declare Integer sets, numbers Constant Integer MAX_SETS = 5 Constant Integer MAX_NUMBERS = 2 Set sum = 0; Set total = 0; For sets = 1 To MAX_NUMBERS For numbers = 1 To MAX_SETS Display "Enter number ", numbers, " of set ", sets, "." Input number; Set sum = sum + number End For Display "The sum of set ", sets, " is ", sum "." Set total = total + sum Set sum = 0 End For Display "The total of all the sets is ", total, "."arrow_forwardNeed help converting loops!1. Convert the following While loop to a For loop: Declare Integer count = 0 While count < 50 Display "The count is ", count Set count = count + 1 End While _________________________________________________ 2. Convert the following For loop to a While loop: Declare Integer count For count = 1 To 50 Display count End Forarrow_forward
- Database System ConceptsComputer ScienceISBN:9780078022159Author:Abraham Silberschatz Professor, Henry F. Korth, S. SudarshanPublisher:McGraw-Hill EducationStarting Out with Python (4th Edition)Computer ScienceISBN:9780134444321Author:Tony GaddisPublisher:PEARSONDigital Fundamentals (11th Edition)Computer ScienceISBN:9780132737968Author:Thomas L. FloydPublisher:PEARSON
- C How to Program (8th Edition)Computer ScienceISBN:9780133976892Author:Paul J. Deitel, Harvey DeitelPublisher:PEARSONDatabase Systems: Design, Implementation, & Manag...Computer ScienceISBN:9781337627900Author:Carlos Coronel, Steven MorrisPublisher:Cengage LearningProgrammable Logic ControllersComputer ScienceISBN:9780073373843Author:Frank D. PetruzellaPublisher:McGraw-Hill Education





