How to use delete from function.

SQLite is a popular, lightweight, and self-contained relational database management system. It is a serverless, file-based database. This is because it doesn't need a separate server process to manage the database. In addition, the host's file system stores the entire database in a single file. SQLite is helpful in various environments due to its simplicity, speed, and efficiency.   

Security Features of SQLite:  

1. Encryption Extensions  

SQLite supports encryption extensions like SQL Cipher. This provides the ability to encrypt the entire database file. With an encryption extension, the data stored encrypts in the database. Thus making it harder for unauthorized users to access or decipher the data.  

2. Encrypted Database Files:  

When using encryption extensions like SQL Cipher, the database file encrypts itself. Thus ensuring data remains confidential even if unauthorized individuals obtain the file.  

3. Secure Password Protection:  

SQLite allows you to set a password to protect the DB file from unauthorized access. Encrypt the file with a user-defined password, and the database will be inaccessible without the correct password.  

4. PRAGMA Key: 

With SQLite, you can use the PRAGMA key statement to set or change the encryption key. This allows you to manage and update the encryption key as needed.  

5. SQLITE_HAS_CODEC:  

Some builds of SQLite can be compiled with the SQLITE_HAS_CODEC option. This enables encryption capabilities. This option helps in conjunction with encryption extensions like SQL Cipher.  

6. Secure Sockets Layer (SSL/TLS) Support 

SQLite supports SSL/TLS to encrypt data transmitted between the database and clients. Thus enhancing security for client-server configurations.  

7. File System Permissions 

You can control the SQLite database file access by setting appropriate permissions. Restrict read and write access to authorized users and use OS-level security features.  

In conclusion, SQLite is a valuable tool in your daily work. It offers a combination of simplicity, efficiency, and versatility. SQLite can help you streamline your work, improve productivity, and manage your data. This applies to managing data for a small application or developing a complex system. Its flexibility and portability make it an essential database engine for various projects. 

Here is the example of how to delete from function.

Fig: Preview of the output that you will get on running this code from your IDE.

Code

In this solution we are using SQLite3 library of Python.

Instructions

Follow the steps carefully to get the output easily.

1. Download and Install the PyCharm Community Edition on your computer.
2. Open the terminal and install the required libraries with the following commands.
3. Install SQLite3 - pip install SQLite3.
4. Create a new Python file on your IDE.
5. Copy the snippet using the 'copy' button and paste it into your Python file.
6. Run the current file to generate the output.

I hope you found this useful.

I found this code snippet by searching for 'delete buttons defined in other Functions' in Kandi. You can try any such use case!

Environment Tested

I tested this solution in the following versions. Be mindful of changes when working with other versions.

1. PyCharm Community Edition 2023.1.2
2. The solution is created in Python 3.8 Version
3. SQLite 3.7.15 Version.

Using this solution, we can be able to use delete from function in Python with simple steps. This process also facilities an easy way to use, hassle-free method to create a hands-on working version of code which would help us to use delete from function in Python.

Dependent Library

You can search for any dependent library on kandi like 'sqlite-web'.

FAQ 

1. What is the syntax for SQLite Delete?   

In SQLite, use the DELETE statement to remove multiple rows from a table that meet specific conditions. The basic syntax for the DELETE statement.   

Here's a breakdown of the syntax:  

• DELETE FROM: This part of the statement indicates that you want to delete data from a specific table.  
• table_name: Replace this with the name of the table from which you want to delete data.  
• WHERE condition: This is an optional part of the statement. If provided, it specifies to meet the condition for deleting rows. If you omit the WHERE clause, it deletes all rows in the specified table.  

2. What happens to table content when executing an SQLite Delete command?   

It executes a DELETE command in SQLite. It also removes one or more rows from a table based on the specified conditions in the WHERE clause.   

1. Deleted Rows:  

Rows that match the specified condition in the WHERE clause removes from the table. The table deletes these rows, and you can not recover them unless you have a database backup.  

2. Table Structure:  

The table's structure, including column names, data types, and constraints, remains unchanged. It only affects the rows.  

3. Auto-Incremental Primary Keys:  

Row deletions won't reset the auto-increment value with an auto-incrementing primary key. The next inserted row will continue from where the auto-increment counter left off.  

4. Table Size:  

After deleting rows, the table file's size on disk may remain the same. SQLite uses a "vacuum" process to compact the database file and free up unused space. However, this may not happen immediately.  

3. How do I use clause expression in an SQLite Delete statement?   

In SQLite, you can use a clause expression in the DELETE statement. Do this by including a WHERE clause specifying the conditions rows must meet to get deleted. The WHERE clause helps to create these conditions, and it can be as simple or as complex as needed.  

4. Can I use ORDER BY with an SQLite Delete statement?   

In standard SQL, the DELETE statement usually does not include an ORDER BY clause. This is because the purpose of the DELETE statement is to specify which rows to delete. It depends on conditions in a WHERE clause, not the order in which they are deleted. In most DB systems, including SQLite, the order of row deletion is not guaranteed. it is typically based on the database's internal optimization.  

5. When should I use Create Table instead of the SQLite Delete command?  

The CREATE TABLE and DELETE statements in SQLite serve very different purposes. You should use the CREATE TABLE statement when you need to create a new table. Whereas the DELETE statement helps to remove rows from an existing table.   

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