SQLite Overview Quiz

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Questions and Answers

Which of the following SQL operations can be performed on a VIEW in SQLite?

Update existing records

Read data from the view (correct)

Delete existing records

Insert new records

Which command is not supported by the ALTER TABLE operation in SQLite?

RENAME TABLE

DROP COLUMN (correct)

ADD COLUMN

ALTER COLUMN (correct)

What is the primary use of the INSERT command in SQLite's Data Manipulation Language?

To create a new record (correct)

To modify existing records

To view records

To delete records

Which statement about triggers in SQLite is correct?

Only FOR EACH ROW triggers are supported Signup and view all the answers

What does the DROP command do in the context of Data Definition Language?

Deletes an entire table or view Signup and view all the answers

What is the result of executing the command '.header OFF' in SQLite?

Turns off the display of headers in the output Signup and view all the answers

In SQLite, which of the following statements correctly describes Full Outer Join functionality?

Only LEFT OUTER JOIN is implemented Signup and view all the answers

Which permission type can be applied to SQLITE databases?

File access permissions of the underlying operating system Signup and view all the answers

Which mode is not available for setting the output of the SQLite query?

json Signup and view all the answers

What character pair signifies the beginning of a comment in SQLite code?

-- Signup and view all the answers

How does SQLite handle data types compared to other database management systems like MySQL?

SQLite uses a general dynamic type system. Signup and view all the answers

Which of the following is not a storage class provided by SQLite?

FLOAT Signup and view all the answers

What benefit do comments provide in SQLite code?

They improve readability of the code. Signup and view all the answers

What happens when a column in SQLite is declared with an integer data type?

Any data type can be stored in that column. Signup and view all the answers

Which output mode in SQLite will provide values delimited by a specific separator string?

list Signup and view all the answers

What is unique about SQLite's datatype system compared to static type systems?

The datatype is associated with the value rather than the container. Signup and view all the answers

What is the purpose of the ROLLBACK command in SQLite?

To revert the database to its state before the last COMMIT Signup and view all the answers

After executing a COMMIT command, what happens to the changes made in the transaction?

They are permanently saved and cannot be undone. Signup and view all the answers

What is the primary role of a SAVEPOINT in SQLite transactions?

To mark a specific point within a transaction for future rollback or commit Signup and view all the answers

What command is used to release a savepoint in SQLite?

RELEASE Signup and view all the answers

What will happen if a ROLLBACK command is issued without prior COMMIT?

All changes since the last COMMIT will be undone Signup and view all the answers

What is the primary benefit of SQLite's variable length columns?

It reduces the overall database size by allocating minimal space. Signup and view all the answers

Which feature distinguishes SQLite as a cross-platform DBMS?

It operates on a wide range of platforms including embedded systems. Signup and view all the answers

How can multiple SAVEPOINTs be utilized in a transaction?

They can be created to allow rollback to specific points Signup and view all the answers

What is the outcome of executing a DELETE command followed by a ROLLBACK in a transaction?

The records deleted will be restored to their original state Signup and view all the answers

How does SQLite ensure better performance compared to file systems?

It only loads necessary data and modifies only changed parts. Signup and view all the answers

What is true about the SQLite database state after issuing a COMMIT following a DELETE command?

Changes made are irreversible and logged Signup and view all the answers

What is a major advantage of SQLite not requiring installation?

It simplifies the learning curve for new users. Signup and view all the answers

Which of the following describes a situation where SQLite is most useful?

In desktop applications for version control and financial analysis. Signup and view all the answers

What is a common misconception about SQLite's reliability?

It is not suitable for critical applications due to potential power failures. Signup and view all the answers

What is a benefit of SQLite's many available APIs?

It allows developers to use SQLite in a variety of coding languages. Signup and view all the answers

Which characteristic of SQLite contributes to its lightweight nature?

It does not need a server-client architecture. Signup and view all the answers

What is the purpose of the SQLite strftime() function?

To convert a datetime string into a defined format Signup and view all the answers

Which format specifier would you use to extract the day of the week in SQLite?

%w Signup and view all the answers

What is the correct SQLite query to get the current time in HH:MM format?

SELECT strftime('%H:%M','now') as 'Current Time'; Signup and view all the answers

Which query will return the time after 30 seconds from the current time?

SELECT time(), time('now', '+30 seconds'); Signup and view all the answers

How would you extract the year from the current date using SQLite?

SELECT strftime('%Y','now') as 'Year'; Signup and view all the answers

Which of the following statements about obtaining time after 45 minutes is true?

The query is SELECT time(), time('now','+45 minutes'); Signup and view all the answers

What does the %j format specifier represent in SQLite?

Day of the year Signup and view all the answers

In the strftime() function, what does the format specifier %M return?

Minutes Signup and view all the answers

Study Notes

Overview of SQLite

Configuration is not required; SQLite requires no complex setup or administration.
Cross-platform support enables usage on Windows, Mac OS, Linux, Unix, and embedded systems like Symbian and Windows CE.
Efficient data storage methods facilitate straightforward data saving processes.
Column lengths are variable; SQLite allocates only the necessary space for stored values, enhancing memory efficiency.

Advantages of SQLite

Lightweight design allows for integration in embedded systems like televisions, smartphones, cameras, and household electronics.
Performance is superior with fast read/write operations, approximately 35% faster than traditional file systems.
No installation is necessary; users simply download SQLite libraries to get started.
High reliability ensures minimal data loss during power failures due to continuous content updates.

SQLite Commands

Commands are categorized into DDL (Data Definition Language), DML (Data Manipulation Language), and DQL (Data Query Language).
DDL commands include CREATE for object creation, ALTER for modifications, and DROP for deleting objects.
DML commands include INSERT for adding records, UPDATE for modifying records, and DELETE for removing records.
DQL includes SELECT for retrieving data from tables.

SQLite Dot Commands

Special commands that enhance SQLite's usability include .help for assistance and .show for current settings.
.exit or /.quit exits the SQLite prompt; .tables checks for table existence.
Various output modes can be set (.mode) including csv, html, and tab-separated formats.

Comments in SQLite

Comments improve code readability and begin with two hyphens (--). Nested comments are not allowed.

SQLite Data Types

Dynamic type system allows the data type to be associated with the value rather than the column definition, contrasting with static type systems in other DBMS like MySQL.
Five primitive data types (storage classes) reflect SQLite's storage format flexibility.

Transactions in SQLite

ROLLBACK command cancels transactions, reverting to the last successful state.
EXAMPLE usage of ROLLBACK illustrates how to remove inserted records without committing changes.
COMMIT command finalizes changes made during a transaction.

SQLite Savepoints

Savepoints mark specific points in transactions for rollback or acceptance of changes.
CREATE a savepoint using the command SAVEPOINT savepoint_name; and release it with RELEASE savepoint_name.

Time Functions

Queries like SELECT time() and SELECT time('now', '+45 minutes') illustrate SQLite's capability to handle date and time calculations.

strftime() Function

strftime(format, datetimestring, [modifiers]) converts datetime strings into defined formats, enabling date manipulation and retrieval.
Format specifiers include %d (day), %m (month), %Y (year), among others.
Example queries demonstrate extracting specific date and time components from the current date.

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Description

Test your knowledge on SQLite, a versatile and cross-platform database management system. This quiz covers its features, like configuration-free setup and efficient data storage. Dive in to learn more about how SQLite integrates with various operating systems!