303: Database Handling Using Python

Questions and Answers

What is the purpose of the .output command in SQLite?

To establish database connections

To display all data in the console

To specify the file for dumping output (correct)

To create a new table in the database

Which command is used to dump the entire database or tables into a text file?

.output

.schema

.dump (correct)

.export

How would you dump the structure of a single table named 'Employee' into a file?

.output Employee_structure.sql .schema Employee

.schema Employee > Employee_structure.sql (correct)

.dump Employee_structure.sql

.structure Employee to Employee_structure.sql

To dump multiple tables into a single file, what command structure should be used?

.output c:/sqlite/tables.sql .dump table1 .dump table2 Signup and view all the answers

Which command would you use to open a database named 'db1.db'?

sqlite3 db1.db Signup and view all the answers

What happens if the dump command is used without specifying a table name?

It dumps all tables into the specified file. Signup and view all the answers

If you want to save the employee table structure into a file, which format is correct?

.schema employee > employee_structure.sql Signup and view all the answers

What is the first step to dump a specific table from a database?

Run the command '.open database_name'. Signup and view all the answers

What is the primary key of the Sample table?

Roll_no Signup and view all the answers

What command is used to change the separator for CSV files in SQLite?

.separator , Signup and view all the answers

Which command allows you to import a CSV file into an SQLite table?

.import SYBCADIV1.csv sample Signup and view all the answers

What command needs to be executed first to ensure that column names are included in the exported CSV file?

.header on Signup and view all the answers

Where will the exported CSV file be located after executing the export commands?

c:/sqlite Signup and view all the answers

Which command is used to set the mode to CSV in SQLite before exporting data?

.mode csv Signup and view all the answers

What is the final step to export data from a table to a CSV file?

Use SELECT statement Signup and view all the answers

How is the output filename specified for exporting data?

.output product.csv Signup and view all the answers

What command is used to specify the output file for dumping data from a database?

.output Signup and view all the answers

Which command would you use to dump the entire structure and data of an SQLite database?

.dump Signup and view all the answers

What would the command to dump a specific table named 'Employee' into a file named 'Employee_structure.sql' look like?

.output c:/sqlite/Employee_structure.sql.schema Employee.quit Signup and view all the answers

In order to dump the structure of multiple tables, which command should be used?

.output c:/sqlite/EMP_DEP_structure.sql.schema table1.schema table2.quit Signup and view all the answers

When you want to see the dumped SQL statements on screen without saving them to a file, which command do you initially use?

.dump Signup and view all the answers

What is the purpose of the '.quit' command in the context of dumping a database?

To exit the SQLite command line interface Signup and view all the answers

What is the correct sequence to start the process of dumping a database?

Open the database, issue .output command, then execute .dump Signup and view all the answers

How do you specify a filename for dumping your entire SQLite database?

.output FILENAME, then .dump Signup and view all the answers

What command should be used to set the mode to insert before dumping data?

.mode insert Signup and view all the answers

Which command is used to specify the output file for dumping data?

.output data.sql Signup and view all the answers

What must be true about the table before executing the .import command?

The table must already exist. Signup and view all the answers

Which of the following commands is correct for dumping data from the Employee table?

SELECT * FROM Employee; Signup and view all the answers

What command is required before using .import to read a CSV file?

.mode CSV Signup and view all the answers

Which command will combine data dumps from multiple tables into a single file?

SELECT * FROM Employee; SELECT * FROM Department; Signup and view all the answers

What command is necessary to prepare for importing data from external files into a database table?

.mode CSV Signup and view all the answers

If you want to dump data from both the Employee and Department tables into a single output file, which sequence of commands is correct?

.mode insert; .output dump.sql; SELECT * FROM Employee; SELECT * FROM Department; Signup and view all the answers

Study Notes

SQLite Dump Commands

Use dot-commands for efficient database operations in SQLite.
The .dump command exports the entire database or specific tables to a text file.

Dumping Specific Tables

Dump a single table by specifying the table name with .dump.
Example command:
- .output c:/sqlite/product.sql
- .dump product
- .quit
To dump multiple tables at once, use additional .dump table_name commands:
- .output c:/sqlite/product.sql
- .dump product
- .dump product_log
- .quit

Dumping Table Structures

Use .schema to dump the structure of a table.
Example command for a single table:
- .output c:/sqlite/Employee_structure.sql
- .schema Employee
- .quit
For multiple tables:
- .output c:/sqlite/EMP_DEP_structure.sql
- .schema Employee
- .schema Department
- .quit
Dump all tables' structures with:
- .output c:/sqlite/Schema.sql
- .schema
- .quit

Dumping Entire Database

The .dump command exports the entire database's data and structure to a text file.
Use .output c:/sqlite/db1.sql to specify the output file.

Dumping Data from Tables

To dump the data as INSERT statements, set the mode to insert:
- .mode insert
Specify the output file with .output data.sql.
Query data using SELECT statements:
- SELECT * FROM Employee;
For multiple tables, repeat the steps for each table desired.

CSV File Handling

Import data from a CSV file into a SQLite table with .import command.
Ensure the table exists and set mode to CSV using:
- .mode CSV
Change the default separator from colon (:) to comma (,) using:
- .separator ,
Create a table before importing, e.g., Sample with Roll_no and Name as columns.
Command to import data from a CSV file:
- .import SYBCADIV1.csv Sample
Check the imported data using:
- SELECT * FROM Sample;

Exporting CSV Files

Export data from a database table to a CSV file with the following steps:
- Use .header on to include column names in the exported file.
- Set the export mode to CSV with .mode CSV.
- Specify the output file with .output product.csv.
To export data, use:
- SELECT * FROM product;
The resulting product.csv will be created in the specified folder.

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Description

This quiz focuses on database backup and CSV handling using Python, specifically covering the SQLite dump command. You'll learn how to dump an entire database or specific tables into a text file, which is essential for database management and backup processes. Test your knowledge and skills on this crucial topic in database handling.

303: Database Handling Using Python - Unit 2