Podcast
Questions and Answers
Which of the following is a valid replacement for the given SQL query?
Which of the following is a valid replacement for the given SQL query?
- SELECT name FROM instructor1 WHERE salary BETWEEN 90000 AND 100000;
- SELECT name FROM instructor1 WHERE salary = 90000; (correct)
- SELECT name FROM instructor| WHERE salary BETWEEN 90000 AND 100000;
- SELECT name FROM instructor1 WHERE salary BETWEEN 100000 AND 90000;
What type of software is a Database Management System?
What type of software is a Database Management System?
- Utility software
- Programming software
- System software (correct)
- Application software
What does the term 'FAT' stand for in the context of databases?
What does the term 'FAT' stand for in the context of databases?
- File Attribute Table
- File Allocation Table (correct)
- File Access Technology
- Fast Access Table
Which of the following describes the maximum size supported by FAT?
Which of the following describes the maximum size supported by FAT?
What does 'NTFS' refer to in the context of data storage?
What does 'NTFS' refer to in the context of data storage?
What is the primary purpose of a Database Management System?
What is the primary purpose of a Database Management System?
Which operation in a Database Management System involves querying, inserting, deleting, and modifying data?
Which operation in a Database Management System involves querying, inserting, deleting, and modifying data?
In SQL, what can replace the given query 'SELECT name, course_id FROM instructor, teaches WHERE instructor_ID = teaches_ID;'?
In SQL, what can replace the given query 'SELECT name, course_id FROM instructor, teaches WHERE instructor_ID = teaches_ID;'?
Which type of relationship is defined as 'one to many' in a Database Management System?
Which type of relationship is defined as 'one to many' in a Database Management System?
In the SQL query 'SELECT emp_name FROM department WHERE dept_name LIKE '___ Computer Science';', what should be placed in the blank to select departments ending with 'Computer Science'?
In the SQL query 'SELECT emp_name FROM department WHERE dept_name LIKE '___ Computer Science';', what should be placed in the blank to select departments ending with 'Computer Science'?
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Study Notes
Database Management System
- A Database Management System is a type of software.
SQL Queries
- The query
SELECT * FROM instructor ORDER BY salary ____,name ____can be replaced withSELECT name FROM instructor1 WHERE salary BETWEEN 90000 AND 100000. - The query
SELECT name, course_id FROM instructor, teaches WHERE instructor_ID= teaches_IDis used to query information from the database and insert tuples into, delete tuples from, and modify tuples in the database.
Data Storage
- The term "FAT" stands for File Allocation Table.
- The maximum size that is supported by FAT is 4GB.
- The term "NTFS" refers to New Technology File System.
- The maximum size that is supported by NTFS is 256TB.
Data Warehouse
- A huge collection of information or data accumulated from several different sources is known as a data warehouse.
- A data warehouse can be used to extract or filter the data and information from the data.
Data Redundancy
- Redundancy refers to the copies of the same data occupying the memory space at multiple places.
Data Abstraction
- Metadata refers to the data about data.
- The physical level of data abstraction describes exactly how the data is actually stored.
Database Administration
- The term "DBA" refers to Database Administrator.
File System
- A file is a collection of all related data.
- The term "Data" refers to the facts and statistics collected together for reference or analysis.
Relational Database
- Rows of a relation are known as tuples.
- The number of tuples in a relation is called the cardinality of the relation.
- An attribute is a column or field in a relational database.
- The number of attributes in a relation is called the degree of the relation.
SQL Commands
- The
INSERTcommand is a type of Data Manipulation Command. - The
CREATEcommand is a type of Data Definition Language command. - The
DELETEcommand is used to delete the existing row in a table. - The
COMMITcommand is used to save any transaction permanently into the database.
Data Modeling
- Top-down approach is a method in which the entity's higher level can be divided into two lower sub-entities.
- Bottom-up approach is a method in which the multiple lower entities are grouped together to form a single higher-level entity.
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