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Relational Databases and SQL: Key Concepts and Data Integrity
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What is a database? A structured and organized collection of data designed to efficiently store, retrieve, and manage information.
What does DBMS stand for? Database Management System.
What are the main functions of a DBMS?
Create databases, create tables, modify data, read data, maintain structures, enforce rules, control concurrency, and perform backup and recovery.
What is metadata? Data about data; it describes the structure and organization of the database.
Name four popular relational database management systems (RDBMS).
MySQL, MS SQL Server, PostgreSQL, and Oracle.
What distinguishes relational databases from NoSQL databases?
Relational databases use structured tables and relationships, while NoSQL databases use non- relational data models.
What is the significance of the year 1970 in database history?
It marks the introduction of the Relational Model by E.F. Codd.
What is an entity in the context of relational databases?
An identifiable thing that users want to track, such as customers, computers, or sales.
What does each table in a relational database represent?
A specific entity set, such as customer information or product details.
What do rows and columns represent in a relational database table?
Rows represent individual entities, and columns represent specific attributes or fields of those entities.
What is the significance of XML in web-based database applications?
XML provides benefits for data interchange and is important for modern web applications.
What is the relationship between cloud computing and databases?
Cloud computing services are increasingly used to host servers, applications, and data for databases.
What does the term 'post-relational developments' refer to?
Innovations in database technology that extend beyond traditional relational models, including object-oriented databases and NoSQL.
What is the main advantage of open- source DBMS products?
They provide similar functionality and features to commercial DBMS at a reduced cost.
What is the role of HTTP in web databases?
HTTP is used to connect web pages over the Internet, facilitating data exchange.
What is a relation in a database? A relation is a table with unique names for each column, holding single values in cells.
What is the domain integrity constraint?
It requires that all values in a column are of the same kind, ensuring data type consistency.
What is a primary key? A primary key is a candidate key selected to uniquely identify rows in a relation.
What is a composite key? A composite key is a key that consists of two or more columns used to identify rows in a relation.
What is a surrogate key? A surrogate key is an artificial column added to a relation to serve as a primary key, often numeric and meaningless to users.
What is the entity integrity constraint?
It requires that the primary key must have unique data values and cannot contain NULL values.
What is a foreign key? A foreign key is a column or set of columns that is the primary key of another table, establishing a relationship between the two tables.
What is the referential integrity constraint?
It limits the values of a foreign key to those that already exist as primary key values in the corresponding relation.
What are the three main data integrity constraints?
The domain integrity constraint, the entity integrity constraint, and the referential integrity constraint.
What is a candidate key? A candidate key is a key that can uniquely identify all other columns in a relation.
What does it mean for a column to be NOT NULL?
It indicates that the column must have a value and cannot be left empty.
What is a table's naming convention in this context?
Table names are in all capital letters, while column names have an initial capital letter with compound names capitalized for each word.
What is the purpose of data integrity?
To ensure that the data in a database is useful and meaningful.
What is an example of a domain in a database?
A domain could be a set of valid values for a column, such as country names like 'United States' or 'Spain'.
How does a DBMS enforce domain integrity?
By specifying data types and using validation rules to restrict input values.
What syntax does the textbook use for SQL?
Microsoft's SQL Server 2019 syntax.
What is SQL primarily used for? Creating and processing database data and metadata.
What are the five categories of SQL statements?
Data Definition Language (DDL), Data Manipulation Language (DML), SQL/Persistent Stored Modules (SQL/PSM), Transaction Control Language (TCL), and Data Control Language (DCL).
What does the SQL SELECT statement do?
It retrieves data from a database table.
What is the simplest form of an SQL SELECT statement?
SELECT * FROM {TableName};
What does the SQL operator '=' signify?
Is equal to.
What does the SQL operator '<>' signify?
Is NOT equal to.
What does the SQL operator 'BETWEEN' do?
Checks if a value is within a range of numbers, including the endpoints.
What does the SQL operator 'LIKE' do?
Matches a sequence of characters.
What does the SQL operator 'AND' signify?
Both conditions must be TRUE.
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What is the purpose of the View Ridge Gallery (VRG) database?
To sell contemporary European and North American fine art.
What are the main tables in the View Ridge Gallery database?
What SQL function is used for string concatenation?
What does the SQL function LOWER() do?
Converts a string to lowercase.
What does the SQL function DATEDIFF() calculate?
The difference between two dates.
What is the significance of using an alias in SQL SELECT statements?
It allows for renaming a column or expression for better readability.
What is the syntax for ordering results in an SQL query?
Using the ORDER BY clause.
What is the purpose of the semicolon at the end of SQL statements?
It signifies the end of the statement.
