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Questions and Answers
What does the DROP TABLE statement do in SQLite?
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?
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?
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?
What does the SELECT statement do in SQLite?
What will happen if the DELETE statement is executed without a WHERE clause?
What will happen if the DELETE statement is executed without a WHERE clause?
Which of the following correctly describes the INSERT INTO statement in SQLite?
Which of the following correctly describes the INSERT INTO statement in SQLite?
Which clause must be used with the UPDATE statement to avoid modifying all rows in a table?
Which clause must be used with the UPDATE statement to avoid modifying all rows in a table?
In the SQL command SELECT * FROM student;, what does the asterisk (*) signify?
In the SQL command SELECT * FROM student;, what does the asterisk (*) signify?
What will be the result of the UPDATE statement that sets DEPT_ID to 'Unknown' where DEPT_ID is NULL?
What will be the result of the UPDATE statement that sets DEPT_ID to 'Unknown' where DEPT_ID is NULL?
In an INSERT statement, what purpose does the WHERE clause serve when filtering DEPT_ID is NULL?
In an INSERT statement, what purpose does the WHERE clause serve when filtering DEPT_ID is NULL?
What is the first evaluated condition in a CASE statement?
What is the first evaluated condition in a CASE statement?
Which of the following is true about a transaction in database handling?
Which of the following is true about a transaction in database handling?
What output does the given SELECT statement produce when executed?
What output does the given SELECT statement produce when executed?
What will occur if no conditions in a CASE statement are satisfied?
What will occur if no conditions in a CASE statement are satisfied?
What does the CREATE TABLE statement in the provided example define for each student?
What does the CREATE TABLE statement in the provided example define for each student?
How does the evaluation order of WHEN clauses in a CASE statement affect the output?
How does the evaluation order of WHEN clauses in a CASE statement affect the output?
What happens when the ROLLBACK command is executed with respect to a savepoint?
What happens when the ROLLBACK command is executed with respect to a savepoint?
Which SQL command is used to create a savepoint?
Which SQL command is used to create a savepoint?
What type of SQL JOIN combines records based on a condition from both tables?
What type of SQL JOIN combines records based on a condition from both tables?
If a savepoint named 'b' was created and a ROLLBACK command is issued to that savepoint, which values would be retained?
If a savepoint named 'b' was created and a ROLLBACK command is issued to that savepoint, which values would be retained?
Which of the following types of joins allows duplication of rows in the result set?
Which of the following types of joins allows duplication of rows in the result set?
In SQLite, what is the purpose of a JOIN clause?
In SQLite, what is the purpose of a JOIN clause?
What is the main characteristic of an outer join?
What is the main characteristic of an outer join?
Which command is used to finalize all changes made during a transaction?
Which command is used to finalize all changes made during a transaction?
Which output mode is NOT a valid option when using the specified command for tables?
Which output mode is NOT a valid option when using the specified command for tables?
What distinguishes SQLite's data type system from that of traditional database management systems like MySQL?
What distinguishes SQLite's data type system from that of traditional database management systems like MySQL?
Which of the following is a correct statement about comments in SQLite?
Which of the following is a correct statement about comments in SQLite?
How many primitive data types does SQLite provide, referred to as storage classes?
How many primitive data types does SQLite provide, referred to as storage classes?
What happens if you declare a column with the INTEGER data type in SQLite?
What happens if you declare a column with the INTEGER data type in SQLite?
Which of the following describes the purpose of a storage class in SQLite?
Which of the following describes the purpose of a storage class in SQLite?
Which output format provides values delimited by a specified separator string in SQLite?
Which output format provides values delimited by a specified separator string in SQLite?
What is the correct way to start a comment in SQLite?
What is the correct way to start a comment in SQLite?
What happens if there is an error during the execution of T-SQL statements within a transaction?
What happens if there is an error during the execution of T-SQL statements within a transaction?
Which property of a transaction ensures that all operations are completed successfully or none at all?
Which property of a transaction ensures that all operations are completed successfully or none at all?
When is the COMMIT command executed successfully, and what does it accomplish?
When is the COMMIT command executed successfully, and what does it accomplish?
Which command is used to begin a transaction?
Which command is used to begin a transaction?
What does the Durability property guarantee in a transaction?
What does the Durability property guarantee in a transaction?
Which of the following commands can be used to control transactions?
Which of the following commands can be used to control transactions?
In SQLite, what is the purpose of the ROLLBACK command?
In SQLite, what is the purpose of the ROLLBACK command?
What is the optional keyword that can be used with the BEGIN command in SQLite?
What is the optional keyword that can be used with the BEGIN command in SQLite?
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 INTOstatement to add data to a table. - Syntax includes optional columns specified in parentheses before VALUES.
SELECT Statement
- Fetches data from a table using the
SELECTkeyword. - Example syntax:
SELECT column1, column2 FROM table_name;. - Wildcard
*can be used to select all columns.
UPDATE Statement
- Modifies existing records using the
UPDATEkeyword. - Requires a
WHEREclause to specify which records to update.
DELETE Statement
- Used to delete existing records from a table.
- Can specify which records to delete using the
WHEREclause, 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
BEGINorBEGIN TRANSACTIONto initiate a transaction. COMMITsaves all changes, becoming visible to others.ROLLBACKundoes 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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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.
