Podcast
Questions and Answers
Which type of language is used to modify the data structures that form a relational database?
Which type of language is used to modify the data structures that form a relational database?
- Data Definition Language (DDL) (correct)
- Data Manipulation Language (DML)
- Structured Query Language (SQL)
- Extensible Markup Language (XML)
Which of the following tasks would typically be performed using a DML?
Which of the following tasks would typically be performed using a DML?
- Defining a primary key
- Adding new data records (correct)
- Creating a new database
- Modifying an existing table structure
What is the primary purpose of an SQL script?
What is the primary purpose of an SQL script?
- To define the structure of a database.
- To manage user permissions.
- To automatically perform a sequence of database operations. (correct)
- To optimize query performance.
Which SQL command is used to create a new, empty database?
Which SQL command is used to create a new, empty database?
Which SQL command enables changes to be made to the structure of an existing table?
Which SQL command enables changes to be made to the structure of an existing table?
Which SQL command is used to define a new table in a database?
Which SQL command is used to define a new table in a database?
Which SQL command is used to establish a link between two tables based on a shared attribute?
Which SQL command is used to establish a link between two tables based on a shared attribute?
Which data type is suitable for storing textual information of a fixed length in SQL?
Which data type is suitable for storing textual information of a fixed length in SQL?
Which data type is used for storing 'true' or 'false' values?
Which data type is used for storing 'true' or 'false' values?
Which data type should be used to store numerical values that may include fractional parts?
Which data type should be used to store numerical values that may include fractional parts?
Which of the following describes the function of DDL?
Which of the following describes the function of DDL?
In the context of SQL, what is a 'script'?
In the context of SQL, what is a 'script'?
Which of the following SQL commands is NOT a DDL command?
Which of the following SQL commands is NOT a DDL command?
If you need to store the exact time a record was created (including hours, minutes, and seconds), which data type would be most appropriate?
If you need to store the exact time a record was created (including hours, minutes, and seconds), which data type would be most appropriate?
How does VARCHAR() differ from CHARACTER in SQL?
How does VARCHAR() differ from CHARACTER in SQL?
What is the primary function of a PRIMARY KEY constraint in a database table?
What is the primary function of a PRIMARY KEY constraint in a database table?
What year was SQL developed in?
What year was SQL developed in?
What is the relationship between DDL and DML in the context of SQL?
What is the relationship between DDL and DML in the context of SQL?
Which statement accurately describes the role of SQL in database management?
Which statement accurately describes the role of SQL in database management?
Which of the following scenarios would necessitate the use of DDL commands?
Which of the following scenarios would necessitate the use of DDL commands?
Which of the following tasks cannot be accomplished using DDL commands?
Which of the following tasks cannot be accomplished using DDL commands?
Given the data types DATE and TIME, which data type would be most appropriate for storing the exact moment an event occurred, including both date and time components?
Given the data types DATE and TIME, which data type would be most appropriate for storing the exact moment an event occurred, including both date and time components?
Which statement is true regarding the use of SQL scripts in database management?
Which statement is true regarding the use of SQL scripts in database management?
If you need to rename a column in a table, which type of SQL command would you typically use?
If you need to rename a column in a table, which type of SQL command would you typically use?
What is the implication of setting a column's data type to CHARACTER(10)?
What is the implication of setting a column's data type to CHARACTER(10)?
Which action is the most direct method to remove a table and all its data from a database?
Which action is the most direct method to remove a table and all its data from a database?
How does a FOREIGN KEY constraint enforce data integrity in a relational database?
How does a FOREIGN KEY constraint enforce data integrity in a relational database?
What is the purpose of using ALTER TABLE command in SQL?
What is the purpose of using ALTER TABLE command in SQL?
Which of the following is a key difference between DATE and TIMESTAMP data types in SQL?
Which of the following is a key difference between DATE and TIMESTAMP data types in SQL?
How do SQL scripts enhance database management practices?
How do SQL scripts enhance database management practices?
What would be the MOST appropriate data type to store a monetary value, such as a price, in a SQL database?
What would be the MOST appropriate data type to store a monetary value, such as a price, in a SQL database?
You are designing a database for a library. You need to store the date when each book was acquired. However, you also need to track the exact time when the book was cataloged into the system. Which data types would be MOST suitable for these two requirements?
You are designing a database for a library. You need to store the date when each book was acquired. However, you also need to track the exact time when the book was cataloged into the system. Which data types would be MOST suitable for these two requirements?
A developer intends to update a table with millions of records, but wants to first test these changes on a small subset of data, and then later apply the changes on the entire table. Which approach is MOST efficient and safe?
A developer intends to update a table with millions of records, but wants to first test these changes on a small subset of data, and then later apply the changes on the entire table. Which approach is MOST efficient and safe?
You are designing a database for a social media platform, and the database system uses SQL. The platform requires storing user-generated content, which can vary widely in length—from a few characters to several paragraphs. Which data type offers the MOST efficient balance between storage utilization and the ability to accommodate this variability?
You are designing a database for a social media platform, and the database system uses SQL. The platform requires storing user-generated content, which can vary widely in length—from a few characters to several paragraphs. Which data type offers the MOST efficient balance between storage utilization and the ability to accommodate this variability?
What potential issue might arise if a CHARACTER data type is used to store values of varying length, knowing the database pads values shorter than the defined length with spaces?
What potential issue might arise if a CHARACTER data type is used to store values of varying length, knowing the database pads values shorter than the defined length with spaces?
An engineer wants to create a highly available database system. Which of the following strategies could be employed using DDL commands?
An engineer wants to create a highly available database system. Which of the following strategies could be employed using DDL commands?
Flashcards
Data Definition Language (DDL)
Data Definition Language (DDL)
A language used to create, modify, and remove data structures in a database.
Data Manipulation Language (DML)
Data Manipulation Language (DML)
A language used to add, modify, delete, and retrieve data within a database.
SQL Script
SQL Script
A list of SQL commands that perform a specific task, often stored in a file.
Structured Query Language (SQL)
Structured Query Language (SQL)
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CREATE DATABASE
CREATE DATABASE
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CREATE TABLE
CREATE TABLE
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ALTER TABLE
ALTER TABLE
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PRIMARY KEY
PRIMARY KEY
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FOREIGN KEY
FOREIGN KEY
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CHARACTER
CHARACTER
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VARCHAR()
VARCHAR()
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BOOLEAN
BOOLEAN
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INTEGER
INTEGER
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REAL
REAL
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DATE
DATE
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TIME
TIME
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Study Notes
- Data Definition Language (DDL) is a language used to create, modify, and remove data structures that form a database.
- Data Manipulation Language (DML) is a language used to add, modify, delete, and retrieve data stored in a relational database.
- An SQL script is a list of SQL commands that perform a task, often stored in a file for reuse.
- DBMSs use DDL to create, modify, and remove data structures in a relational database.
- DDL statements are written as a script using syntax similar to a computer program.
- DBMSs use DML to add, modify, delete, and retrieve data stored in a relational database.
- DML statements are written in a script similar to a computer program.
- DDL is used for working on the relational database structure.
- DML is used to work with the data stored in the relational database.
- Most DBMSs use Structured Query Language (SQL) for both data definition and data manipulation.
- SQL was developed in the 1970s and has since become an industry standard.
- Practical experience writing SQL scripts is important for understanding and writing SQL.
- MySQL and SQLite are freely available applications for writing SQL scripts.
- It is important to check the commands available when using an SQL application.
SQL (DDL) Commands and Scripts
- CREATE DATABASE creates a database.
- CREATE TABLE creates a table definition.
- ALTER TABLE changes the definition of a table.
- PRIMARY KEY adds a primary key to a table.
- FOREIGN KEY adds a foreign key to a table.
Data Types for Attributes in SQL
- CHARACTER is a fixed length text data type.
- VARCHAR is a variable length text data type.
- BOOLEAN is a true or false data type; SQL uses the integers 1 and 0.
- INTEGER is a whole number data type.
- REAL is a number with decimal places data type.
- DATE is a date usually formatted as YYYY MM DD.
- TIME is a time usually formatted as HH:MM:SS.
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