#Null Value In Databases

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#Null Value In Databases Reel by @databytes_by_shubham (verified account) - When to handle null values in data science becomes important once you realize nulls are not always missing, they often carry meaning. Sometimes null s
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@databytes_by_shubham
When to handle null values in data science becomes important once you realize nulls are not always missing, they often carry meaning. Sometimes null should be treated as a separate category, especially when absence itself is a signal. In other cases, filling with mean, median, or mode works for stable distributions, while forward and backward fill help in sequential data. For more intelligent imputation, KNN imputer uses similarity between data points to estimate missing values. The real skill is not just filling nulls, but understanding why they exist. Correct handling of null values improves model accuracy, data integrity, and real world decision making in machine learning. #shubhamdadhich #databytes #datacleaning #featureengineering #datascience
#Null Value In Databases Reel by @nakulsharmma - Watch till end to understand the difference between null, empty, zero values in SQL. Also comment NULL for interview traps in this topic ! #job #dat
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@nakulsharmma
Watch till end to understand the difference between null, empty, zero values in SQL. Also comment NULL for interview traps in this topic ! #job #database #corporate #interview #training
#Null Value In Databases Reel by @chithappens.co - A p-value, or probability value, is a statistical measurement that indicates how likely it is that a set of data could have occurred under a null hypo
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@chithappens.co
A p-value, or probability value, is a statistical measurement that indicates how likely it is that a set of data could have occurred under a null hypothesis What it measures The probability that the observed results could have occurred if the null hypothesis were true What it indicates A smaller p-value indicates greater statistical incompatibility between the data and the null hypothesis #simplystatistics #psychology #research #statistics #dissertation #psychmajor #mapsychology #pvalue #psychologyfacts
#Null Value In Databases Reel by @ain_academy_ - Don't Compare NULL Like This Use IS Instead! Struggling to understand how NULL works in SQL? In this video, you'll learn how to use the IS operator
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@ain_academy_
Don’t Compare NULL Like This Use IS Instead! Struggling to understand how NULL works in SQL? In this video, you’ll learn how to use the IS operator correctly to check for NULL values. Many beginners make the mistake of using = NULL, but that doesn’t work in SQL. Here, I explain the right way using IS NULL and IS NOT NULL with simple examples. Perfect for beginners who want to write clean and correct SQL queries. Learn faster. Code smarter. #SQL #Database #SQLTutorial #LearnSQL #ainacademy
#Null Value In Databases Reel by @fusion_institute_pune - Part 1: Null Values In Data Science, even small things like null values can have a big impact on your results. 📊 Poor data quality = low accuracy.
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@fusion_institute_pune
Part 1: Null Values In Data Science, even small things like null values can have a big impact on your results. 📊 Poor data quality = low accuracy. And that’s exactly what interviewers are checking. In this video, our trainer explains how null values affect output, Types of methods — and in the next part, we’ll see how to handle them effectively. At Fusion Software Institute, we focus on practical concepts that actually matter in real-world projects and interviews. 💻 Stay tuned for the next part. 📍 Visit Us Office 101, 104 1st Floor, Stellar Spaces, Kharadi South Main Road, opp. Zensar IT Park, Kharadi, Pune, Maharashtra 411014 🌐 www.fusion-institute.com 📞 +91 7498992609 / +91 9503397273 📩 DM to learn more #datascience #dataanalytics #DataScienceLearning #DataScienceCareer #datascienceindia #nullvalues #datacleaning #datapreprocessing #DataQuality #dataanalysis #interviewpreparation #datascienceinterview #techinterviews #JobReadySkills #CareerInIT #FusionSoftwareInstitute #puneeducation #ittrainingpune #kharadipune #learninpune
#Null Value In Databases Reel by @codemeetstech (verified account) - This is a classic SQL interview trap question. Why is NULL = NULL false but IS NULL true in SQL? 1️⃣ NULL means "unknown" In SQL, NULL is not a valu
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@codemeetstech
This is a classic SQL interview trap question. Why is NULL = NULL false but IS NULL true in SQL? 1️⃣ NULL means “unknown” In SQL, NULL is not a value. It represents missing or unknown data. ⸻ 2️⃣ Comparison with unknown is unknown When you write: NULL = NULL You are comparing unknown with unknown → result is UNKNOWN, not TRUE. 3️⃣ SQL uses three-valued logic SQL has: •TRUE •FALSE •UNKNOWN NULL = NULL → UNKNOWN → treated as FALSE in conditions. 4️⃣ IS NULL is a special check: column IS NULL This does not compare values. It checks whether the value is missing → returns TRUE. 🎯 Interview takeaway = compares values IS NULL checks existence NULL is not equal to anything — not even itself. { SQL, Databases, BackendDeveloper, SoftwareDevelopment, Programming, DatabaseConcepts, SystemDesign, ComputerScience, TechCareers, InterviewPrep } #SQL #Databases #BackendEngineering #SystemDesign #TechExplained
#Null Value In Databases Reel by @ranjan_anku - Interesting #sql question asked at booking com. Given two input tables. Both the tables have only one column with the name ID. First table: ID 1 1
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@ranjan_anku
Interesting #sql question asked at booking com. Given two input tables. Both the tables have only one column with the name ID. First table: ID 1 1 2 3 3 NULL NULL Second table: ID 1 NULL 3 NULL What will the output be after applying JOIN like Left, Right, Inner. Also find out the number of corresponding rows for each element of ID columns after every JOINs. #dataengineering #interview #data #database #dataanalytics #datascience #dataanlysis #powerbi #tableau #jobpreparation #interviewquestions Have you seen this SQL question in an interview?
#Null Value In Databases Reel by @codivision.tech - Why are database queries sometimes instant? ⚡ Because of database indexes. Without an index, a database has to scan every row to find what you're lo
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@codivision.tech
Why are database queries sometimes instant? ⚡ Because of database indexes. Without an index, a database has to scan every row to find what you’re looking for. Imagine a table with 10 million users and you search for one email. Without an index → the database checks rows one by one. With an index → it jumps directly to the right location. It works like the index in a book. Instead of reading every page to find a topic, you check the index → jump straight to the page. Under the hood, most databases use B-Trees, which keep data sorted so lookups happen in logarithmic time. That’s why queries that once took seconds suddenly take milliseconds. Follow @codivision.tech for simple explanations of complex tech 🚀 #database #databases #systemdesign #backenddevelopment #webdev
#Null Value In Databases Reel by @codewithkavin - Null vs undefined in javascript 🔥 . @codewithkavin . I'll be sharing more React, JavaScript, and CSS content with clear explanations, handy tricks,
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@codewithkavin
Null vs undefined in javascript 🔥 . @codewithkavin . I’ll be sharing more React, JavaScript, and CSS content with clear explanations, handy tricks, and pro-level tips 🧠⚡ So you never struggle with messy projects again. . #reactdeveloper #reactjs #reacttips #frontenddeveloper #frontendtips #cleanarchitecture #cleancode #javascriptdeveloper #codingcommunity #devcontent #codingreels #codetips #uidevelopment #creativecoding #webdevtips #developerlife #reactfolderstructure #programmingtips #webdevcontent #techreels
#Null Value In Databases Reel by @sqlninjapro - que es null en mysql #mysql #null #sql #basededatos #sqlninjapro
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@sqlninjapro
que es null en mysql #mysql #null #sql #basededatos #sqlninjapro
#Null Value In Databases Reel by @console.laugh - 💀 SQL TRICK QUESTIONS (Most devs get this wrong!) - 🧠 Question 1 SELECT * FROM employees WHERE salary != NULL; 👉 What will this return? -
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@console.laugh
💀 SQL TRICK QUESTIONS (Most devs get this wrong!) — 🧠 Question 1 SELECT * FROM employees WHERE salary != NULL; 👉 What will this return? — ❌ Answer: 0 rows 💡 Explanation: In SQL, NULL is not a value — it represents “unknown” So any comparison like: • salary = NULL • salary != NULL 👉 Always results in UNKNOWN (not TRUE) And SQL only returns rows where condition is TRUE — ✅ Correct way: Use IS NULL or IS NOT NULL — 🧠 Question 2 SELECT name FROM employees WHERE id NOT IN (SELECT manager_id FROM employees); 👉 Looks correct… but what if manager_id contains NULL? 😈 — ❌ Answer: Returns 0 rows (unexpected!) 💡 Explanation: If the subquery contains even ONE NULL, the entire NOT IN condition fails 👉 Because SQL can’t compare values with NULL — ✅ Fix: Filter NULLs inside subquery OR use NOT EXISTS — ⚡ Key Takeaway: NULL breaks logic in SQL more than you think — SQL tricky questions SQL NULL handling SQL interview questions SQL NOT IN vs NOT EXISTS SQL query mistakes SQL beginner mistakes SQL advanced concepts Database interview preparation SQL debugging queries SQL practice questions Learn SQL fast SQL for developers SQL real world problems SQL logic errors Structured Query Language basics #sql #sqldeveloper #sqlqueries #database #databases coding programming developer learnsql sqltips sqlpractice codingchallenge programmers softwaredeveloper tech backend codingreels programmingreels devlife 100daysofcode

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