What is DELETE CASCADE and How it Works in PostgreSQL?
“DELETE CASCADE” feature in Postgres ensures referential integrity by automatically deleting all child records when the corresponding parent record is deleted.
PostgreSQL NOW() Function | Check/Get Current Date and Time
The NOW() function returns the current date and time along with the time zone information. The returned data type of this function is “TIMESTAMPTZ”.
How to Find/Check Database and Table Size in PostgreSQL
To find the database and table sizes in PostgreSQL, the pg_database_size() and the pg_relation_size() functions are used, respectively.
What is String Slicing in Python?
String slicing is a way of accessing a substring from the provided larger string by slicing it. It enables users to extract the desired parts of a string.
How to Install PHP on Debian 12
This blog explained both the installation method for the PHP with the step by step guide. A simple PHP script is also used to test the installation of the PHP.
How to Install pip3 on Debian 12
To install the pip3 package installer on Debian 12, run the “sudo apt install python3-pip -y” command after launching the terminal.
How to Install Plex on Debian 12
To install the updated version of the Plex media server on Debian 12, download its Debian package from its official website.
How to Install Webmin on Debian 12
To install the Webmin on Debian 12, download the repository with its GPG key or download its Debian package. Once done, run the “apt install webmin -y” command
How to Install and Use flatpak on Debian 12
To install flatpak on Debian 12, open the terminal and run the “sudo apt install flatpak -y” command. The basic usage of it is also explained in this blog.
How to List Groups on Debian 12
To list the groups on Debian 12, different command line utilities can be used. These include the getent, groups, libuser-lid,and id commands.
How to Install the chroot in Debian 12
To install the chroot on Debian 12, install the package of the “debootstrap” with the execution of the “sudo apt install debootstrap -y” command.
How to Fix “ls command not found” Error?
To fix the “ls command not found” error, check the spelling and case letter of the command, add an environment PATH variable, and check file permission.
How to List the Disks on Debian 12
To list the disks on Debian 12, ten different methods can be used including the fdisk, cfdisk, sfdisk, lsblk, hwinfo, and lshw commands in the terminal.
How to List Network Interfaces on Debian 12
To list down the network interfaces on Debian 12, twelve different methods including the ip, ifconfig, iwconfig, nmcli, and netstat commands have been explained.
How to Install and Setup Qemu on Debian 12
To install the Qemu on Debian 12, open the terminal and run the command “sudo apt install qemu-kvm libvirt-daemon-system libvirt-clients bridge-utils -y”.
& Ampersand Operator and && AND Operator in Linux Command
The & ampersand operator and && AND operator in Linux commands are used to run processes in the background or in a conditional way.
How to Loop Through a List in Python
To loop through List in Python, different approaches like for Loop, while loop, List Comprehension, enumerate, map() function, etc., can be used.
How to Install the wget Command in Debian 12
To install the wget command on Debian 12, execute the “sudo apt install wget -y” command in the terminal. The wget command is used to download the file or files
How to Remove a Debian Package in Debian 12
To remove a debian package on Debian 12, the apt package manager, the dpkg manager, and the graphical user interface methods can be used.
What is the Usage of the Snap Packages in Debian 12
To use the snap packages on Debian 12, install the snapd command utility with the “sudo apt install snapd -y” command in the terminal.
How to Install netstat on Debian 12
To install the netsat command on Debian 12, open the terminal and run the command “sudo apt install net-tools -y”. It is used to display network’s information.
How to Change the IP Address on Debian 12
To change the IP address on Debian 12, use the ifconfig command, ip address command, nmcli command, nmtui command in the terminal.
How to Use ChatGPT in Linux Terminal
To use the ChatGPT on the Linux terminal, install the “terminalgpt” using the Pip Python package manager. Then login to it with the generated ChatGPT API secret key.
How do I Update/Upgrade pip Itself From Inside my Virtual Environment?
To update/upgrade the pip inside the virtual environment, use commands “pip install –upgrade pip” for Unix and “py -m pip install –upgrade pip” for Windows.
How to Update/Upgrade a Package Using pip
To update/upgrade the packages using the pip, open the terminal and run the command “$ pip install –upgrade [package name]”.
Echo newline in Bash prints literal in Bash \n
The \n can be used with the echo command to add a new line in the bash scripting with the use of the “e” option of the echo command with the \n notation.
‘pip’ is not recognized as an internal or external command
To fix the “‘pip’ is not recognized as an internal or external command”, make sure that the Python has been installed and is added in the Path variable.
How do I Split a String on a Delimiter in Bash?
To split a string on a delimiter in bash programming, users can use the IFS methods, the cut command, the tr command, or the awk command.
Remove an Element From a List by the Index in Python
To remove an element by index in Python, use the pop() method, del keyword, enumerate with for loop, enumerate with list comprehension, or remove() method.
How to Extract the File Name from the Path in Python
The file name is extracted from the path by using os.path.basename(), split(), pathlib.path() function, and the search() method of the regular expressions.
How to Convert Bytes to a String in Python
Various methods in Python like decode(), str(), codec module, and functions from the bytes class and Pandas library can convert the byte data to a string.
How to Sleep/Delay Program Execution in Milliseconds in Python
The Python sleep milliseconds is implemented by two different functions, the sleep() function and the Timer() function of the threading module
Random String Generation with Upper Case Letters and Digits in Python
In Python, random strings with uppercase letters and digits can be generated by using the “random.choice()”, “random.choices()”, and “random.sample()” functions.
How to Install and Configure Hadoop on Ubuntu 22.04
Hadoop can be installed on Ubuntu by downloading its package from the Download section of its official website. Then set up the environment variables.
How to Mount and Unmount Drives on Debian 12
To mount the drive on Debian 12, connect the drive to the computer, create a directory to mount it, and run “sudo mount [device name] [mount directory]” command.
Install or Update the Latest Version of AWS CLI on Debian 12
To install or update the latest version of AWS CLI on Debian 12 either use the pipx Python package manager or the source package.
Convert DataFrame column type from string to DateTime
In Python programming, Using pd.to_datetime() and DataFrame.astype() can convert the DataFrame column type from string to DateTime format.
How to Scroll in Ubuntu Terminal?
The keyboard shortcut key combinations like “Ctrl+Shift+Up”, “Ctrl+Shift+down”, “Shift+pgup”, “Shift+pgdn”, and “Ctrl+end” are used to scroll in Linux Terminal.
How do I Get a List of Locally Installed Python Modules?
To get the list of all locally installed Python modules, users can implement “cmd” commands via “pip” or fetch list by executing “help(‘module’)” command on IDE.
How do I Terminate a Script in Python?
To terminate a script in Python, raise KeyboardInterruption manually by hitting “CTRL+C”, or by raising “KeyboardInterruption”, or using “sys” and “os” modules.
What does “while True” mean in Python?
The “while True” in Python is a loop that iterates infinite iterations with no breakpoint or interrupts until and unless an interrupt like “break” is called.
How To Describe a Table in PostgreSQL
To describe tables in PostgreSQL, the “\dt”, “\dt+” or the “\d tab_name” meta-commands and “information_schema” are used.
How to Find String Length in PostgreSQL
In PostgreSQL, the length of the string can be found by using functions like LENGTH(), OCTET_LENGTH(), and BIT_LENGTH().
Understanding DATE Data Type in PostgreSQL
To create a DATE type column, specify the column’s name followed by the DATE keyword. By default, the DATE data type stores data in “YYYY-MM-DD” format.
How to Install FLAX on Linux
To install the FLAX on Linux, install the pip package in the Linux distribution. Then use the pip command and run “pip install flax”.
Installing Node.js via Package Manager on Debian 12
To install Node.js via package manager on Debian 12, run “sudo apt install nodejs” command. The apt command will install it from Debian’s default repository.
Installing FFmpeg on Debian 12: Two Methods
To install FFmpeg on Debian 12 either run the command “sudo apt install ffmpeg -y” or “sudo snap install ffmpeg” in the terminal.
How to Resize a Partition in Debian 12
To resize a partition on Debian 12, either use the “fdisk” command utility or install the “GParted” application from Debian’s default repository.
How to Install Zoom on Debian 12
To install Zoom on Debian 12, download its debian package with the “wget https://zoom.us/client/5.16.2.8828/zoom_amd64.deb” command and install it.
How to Install tar.gz Packages on Debian 12 via Terminal Commands
To install tar.gz packages on Debian 12 using the commands, download the tar.gz package. Then configure it after extracting and running the software.
How to Download Minecraft Alternatives for Java on Debian 12
To download Minecraft alternative for Java on Debian 12, one can download Minecraft’s Debian package or its snap from Snapcraft.
How to find all files containing specific text (string) on Linux?
To find all the files containing the specific text or string on Linux, use the grep command with its “rnwe” options. Also, the ack and rg commands can be used.
How to Delete exported environment Variable in Linux shell
To delete the exported environment variable in the Linux shell, use the unset command. To use it, open the terminal and run “unset [variable name]”.
How to Find Elements in a List in Python
Various methods in Python like any(), count(), find(), bisect module, or in the statement can be used to search an element in a list.
How to Transpose Pandas DataFrame
A DataFrame can be transposed with the T attribute or the transpose function. To transpose it without an index, pass “copy=false” to the transpose function.
How to Determine the Type of an Object in Python?
In Python, the in-built functions like type() and isinstance() are used to get information about the object’s data type.
PostgreSQL UPDATE – How to Update Table Rows
To update the table values/data in PostgreSQL, the UPDATE command is used. This statement allows the user to update the previous data to new data values.
PostgreSQL SELECT – How to Select Table Records
In PostgreSQL, the SELECT statement is used with the FROM clause to get/fetch the required result from the specified table.
How to Rename the table in PostgreSQL
To rename a table in PostgreSQL, use the ALTER TABLE statement along with the RENAME TO clause. A table can be renamed manually using pgAdmin.
PostgreSQL INSERT – How to Insert New Rows into a Table
To insert values/rows into a Postgres table, use the INSERT INTO statement. The VALUE clause is used to specify the values that need to be inserted.
How to Add Primary Key Constraint to a Column in PostgreSQL
In Postgres, a Primary key can be added to a column during table creation. It can be added to an existing table using the ALTER TABLE ADD CONSTRAINT command.
PostgreSQL DELETE – How to Delete Table Rows
In PostgreSQL, the DELETE statement is used with the FROM clause to delete a single, multiple, or all rows of a specific table.
Langchain: ModuleNotFoundError: No module named ‘langchain’
To fix the error “ModuleNotFoundError: No module named ‘langchain’”, ensure the Python library has been installed with the “pip install langchain” command.
How to Use AppImage in Debian 12
To use the AppImage on Debian 12, download the “AppImage” for your desired package. Change its executable permissions using the “a+x” option of chmod command.
How to Keep Microsoft Teams Status Active (Green) on Linux
To keep the Microsoft Teams status active and green on Linux, set the status of the “Microsoft Teams” to available as explained in this blog.
How to Install RPM Packages on Debian 12
To install the RPM Packages on Debian 12, use the alien tool. Install the RPM packages directly by running the command “sudo alien -i [package name]”.
How to Install Microsoft Teams on Debian 12
Microsoft Teams can be installed on Debian 12 by downloading from its official website. Other installation methods include Snapcraft and Flathub packages.
How to Create a Table in Postgres
To create a table in PostgreSQL, execute the CREATE TABLE statement either in pgAdmin or in psql. Postgres tables can also be created manually using pgAdmin.
How to Create a Database in Postgres
To create a database in PostgreSQL, execute the “CREATE DATABASE” command in the SQL Shell or pgAdmin. Users can also create databases manually using pgAdmin
How to Drop Columns From a Table in PostgreSQL
To drop/delete a column from a PostgreSQL table, we can use the ALTER TABLE statement and the DROP COLUMN clause together.