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SQLite Output Modes and Data Types
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SQLite Output Modes and Data Types

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@FinestGermanium

Questions and Answers

What does the DROP TABLE statement do in SQLite?

  • Modifies the structure of an existing table
  • Adds a new table to the database
  • Creates a backup of the current table
  • Removes a table along with all associated data and constraints (correct)

    • Which of the following is the correct syntax for inserting a record into a table?

  • INSERT TABLE_NAME (column1, column2) VALUES (value1, value2)
  • INSERT INTO TABLE_NAME (value1, value2) VALUES (column1, column2)
  • INSERT INTO TABLE_NAME (column1, column2) VALUES (value1, value2) (correct)
  • INSERT TABLE_NAME VALUES (value1, value2, value3)

    • When using the UPDATE statement in SQLite, what is the purpose of the WHERE clause?

  • To delete the rows from the table
  • To restrict the update to specific records matching the condition (correct)
  • To specify which columns to update
  • To determine the new values for the columns

    • What does the SELECT statement do in SQLite?

    <p>Fetches data from a table</p> Signup and view all the answers

    What will happen if the DELETE statement is executed without a WHERE clause?

    <p>All records in the table will be deleted</p> Signup and view all the answers

    Which of the following correctly describes the INSERT INTO statement in SQLite?

    <p>It can insert records without specifying column names</p> Signup and view all the answers

    Which clause must be used with the UPDATE statement to avoid modifying all rows in a table?

    <p>WHERE</p> Signup and view all the answers

    In the SQL command SELECT * FROM student;, what does the asterisk (*) signify?

    <p>All columns will be fetched from the table</p> Signup and view all the answers

    What will be the result of the UPDATE statement that sets DEPT_ID to 'Unknown' where DEPT_ID is NULL?

    <p>Records in the employees table where DEPT_ID is NULL will be updated.</p> Signup and view all the answers

    In an INSERT statement, what purpose does the WHERE clause serve when filtering DEPT_ID is NULL?

    <p>It specifies which existing records are copied into the new table.</p> Signup and view all the answers

    What is the first evaluated condition in a CASE statement?

    <p>The first WHEN condition listed.</p> Signup and view all the answers

    Which of the following is true about a transaction in database handling?

    <p>Transactions ensure data integrity and control errors.</p> Signup and view all the answers

    What output does the given SELECT statement produce when executed?

    <p>Each student will get a grade based on their individual MARKS.</p> Signup and view all the answers

    What will occur if no conditions in a CASE statement are satisfied?

    <p>The ELSE expression will be executed.</p> Signup and view all the answers

    What does the CREATE TABLE statement in the provided example define for each student?

    <p>Columns to store student IDs, names, and grades.</p> Signup and view all the answers

    How does the evaluation order of WHEN clauses in a CASE statement affect the output?

    <p>The first satisfied condition determines the output, ignoring subsequent conditions.</p> Signup and view all the answers

    What happens when the ROLLBACK command is executed with respect to a savepoint?

    <p>It cancels the transaction up to the specified savepoint.</p> Signup and view all the answers

    Which SQL command is used to create a savepoint?

    <p>SAVEPOINT savepoint_name;</p> Signup and view all the answers

    What type of SQL JOIN combines records based on a condition from both tables?

    <p>Inner join</p> Signup and view all the answers

    If a savepoint named 'b' was created and a ROLLBACK command is issued to that savepoint, which values would be retained?

    <p>All values, including those inserted after 'b'.</p> Signup and view all the answers

    Which of the following types of joins allows duplication of rows in the result set?

    <p>Cross join</p> Signup and view all the answers

    In SQLite, what is the purpose of a JOIN clause?

    <p>To combine records from multiple tables based on common values.</p> Signup and view all the answers

    What is the main characteristic of an outer join?

    <p>It can return unmatched rows from one or both tables.</p> Signup and view all the answers

    Which command is used to finalize all changes made during a transaction?

    <p>COMMIT;</p> Signup and view all the answers

    Which output mode is NOT a valid option when using the specified command for tables?

    <p>json</p> Signup and view all the answers

    What distinguishes SQLite's data type system from that of traditional database management systems like MySQL?

    <p>SQLite's data types are dynamically associated with their values.</p> Signup and view all the answers

    Which of the following is a correct statement about comments in SQLite?

    <p>Comments can help improve code readability.</p> Signup and view all the answers

    How many primitive data types does SQLite provide, referred to as storage classes?

    <p>5</p> Signup and view all the answers

    What happens if you declare a column with the INTEGER data type in SQLite?

    <p>It can store any type of data including text and BLOB.</p> Signup and view all the answers

    Which of the following describes the purpose of a storage class in SQLite?

    <p>It describes the formats used to store data on disk.</p> Signup and view all the answers

    Which output format provides values delimited by a specified separator string in SQLite?

    <p>list</p> Signup and view all the answers

    What is the correct way to start a comment in SQLite?

    <p>--</p> Signup and view all the answers

    What happens if there is an error during the execution of T-SQL statements within a transaction?

    <p>The entire transaction is rolled back.</p> Signup and view all the answers

    Which property of a transaction ensures that all operations are completed successfully or none at all?

    <p>Atomicity</p> Signup and view all the answers

    When is the COMMIT command executed successfully, and what does it accomplish?

    <p>It saves all changes made in the current transaction to the database.</p> Signup and view all the answers

    Which command is used to begin a transaction?

    <p>BEGIN TRANSACTION</p> Signup and view all the answers

    What does the Durability property guarantee in a transaction?

    <p>The outcome of a committed transaction persists after a system failure.</p> Signup and view all the answers

    Which of the following commands can be used to control transactions?

    <p>BEGIN</p> Signup and view all the answers

    In SQLite, what is the purpose of the ROLLBACK command?

    <p>It undoes all changes made by the transaction.</p> Signup and view all the answers

    What is the optional keyword that can be used with the BEGIN command in SQLite?

    <p>TRANSACTION</p> Signup and view all the answers

    Study Notes

    SQLite Output Modes

    • Supports various output modes: csv, column, html, insert, line, list, tabs, tcl.
    • "csv": Outputs data as comma-separated values.
    • "column": Formats output as left-aligned columns.
    • "html": Generates HTML code for the output.
    • "insert": Outputs SQL insert statements for specified tables.
    • "line": Each value is displayed on a separate line.
    • "list": Values are separated by a specified delimiter.
    • "tabs": Data is output as tab-separated values.

    SQLite Comments

    • Comments enhance code readability in SQLite.
    • Begin with two consecutive "--" characters.
    • Can also appear in the format of "/* comment */".
    • Nested comments are not allowed.

    SQLite Data Types

    • SQLite uses a dynamic type system associated with the value rather than the column type.
    • Unlike MySQL's static data types, SQLite allows flexibility in data assignment.
    • Five primitive data types in SQLite: INTEGER, REAL, TEXT, BLOB, and NULL.
    • Storage classes detail how data is stored on disk.

    Table Creation Example

    • Example creates a table named STUDENT with columns for ID, Name, Age, Address, and Fees.

    SQLite DROP TABLE Command

    • Used to remove a table and all its associated data: DROP TABLE database_name.table_name;.

    Inserting Records

    • Use INSERT INTO statement to add data to a table.
    • Syntax includes optional columns specified in parentheses before VALUES.

    SELECT Statement

    • Fetches data from a table using the SELECT keyword.
    • Example syntax: SELECT column1, column2 FROM table_name;.
    • Wildcard * can be used to select all columns.

    UPDATE Statement

    • Modifies existing records using the UPDATE keyword.
    • Requires a WHERE clause to specify which records to update.

    DELETE Statement

    • Used to delete existing records from a table.
    • Can specify which records to delete using the WHERE clause, or delete all records if omitted.

    SQLite CASE Statement

    • Functions similarly to an if-then-else logic structure.
    • Each condition is evaluated in order until a match is found, returning the corresponding expression.

    SQLite Transactions

    • Transactions are units of work ensuring data integrity.
    • Four main properties: Atomicity, Consistency, Isolation, Durability (ACID).
    • Commands for transaction control include BEGIN, COMMIT, and ROLLBACK.

    Managing Transactions

    • Use BEGIN or BEGIN TRANSACTION to initiate a transaction.
    • COMMIT saves all changes, becoming visible to others.
    • ROLLBACK undoes all changes made since the last COMMIT.

    SQLite JOINS

    • Joins combine records from two or more tables based on common values.
    • Types of joins include Inner join, Outer join, Cross join, and Self-Join.
    • Inner join creates a result set based on matching records from both tables.

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    Quiz Team

    Description

    This quiz covers various output modes in SQLite, including formats like CSV, HTML, and more. Additionally, it explores the dynamic data types used in SQLite, comparing them to MySQL. Test your understanding of SQLite features and ensure you have a solid grasp on its usage.

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