9.3K
NAWatch 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
@nakulsharmma
#Null In Sql
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PRHow to use NULL in SQL.
#dsa #sql #coding #college
@pretestpassed.codes
184
PY🔗 Day 8 – SQL Series: RIGHT JOIN 🔥
Want to keep all records from the right table? 🤔
👉 Use RIGHT JOIN in SQL
✨ What you learned today:
• RIGHT JOIN returns all rows from the right table
• Matching data comes from the left table
• Non-matching records show NULL values
📌 Syntax:
SELECT columns
FROM table1
RIGHT JOIN table2
ON table1.id = table2.id;
📊 Example:
SELECT employees.name, departments.dept_name
FROM employees
RIGHT JOIN departments
ON employees.dept_id = departments.id;
✅ Output: Shows all departments even if employees are missing
🔥 Tip:
RIGHT JOIN never removes rows from the right table
🚀 Keep learning SQL daily
Follow for Day 9 (FULL OUTER JOIN)
💾 Save this post for revision
📲 Share with your friends learning SQL
#SQL #LearnSQL #SQLForBeginners #OracleSQL #PLSQL TechLearning CodingJourney DevelopersIndia ITCareer ProgrammingLife Database SQLTutorial CodeNewbie SoftwareDeveloper ReelsIndia StudyWithMe TechReels DailyLearning CareerGrowth WomenInTech
@python_code_pro
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PREver wondered why NULL = NULL is FALSE in SQL, but IS NULL works? 🤯
Here’s the simple truth 👇
In SQL, NULL doesn’t mean “zero” or “empty” — it means “unknown”.
So when you write:
NULL = NULL
You’re actually asking:
👉 “Is an unknown value equal to another unknown value?”
And SQL says:
❌ We don’t know → so the result is FALSE (technically UNKNOWN)
That’s why comparisons with NULL don’t behave like normal values.
Now look at this:
column IS NULL
This isn’t comparing values. Instead, it’s asking:
👉 “Is this value missing?”
And SQL can answer that clearly:
✅ YES → TRUE
💡 Key takeaway:
Use = for known values
Use IS NULL for missing values
⚡ Pro Tip:
NULL breaks normal comparison logic — always handle it explicitly in your queries!
#SQL #Database #CodingTips #DataEngineering #LearnSQL TechExplained
@pradeep.fullstack
30.4K
COAnswer is below, but first comment your answer.
.
.
.
.
.
The correct answer is: B. No rows
SELECT *
FROM table_name
WHERE column_name = NULL
🔴 The key issue:
In SQL, NULL does not behave like a normal value.
* NULL means unknown / missing value
* You cannot compare NULL using = or !=
🧠 Why?
SQL follows three-valued logic:
* TRUE
* FALSE
* UNKNOWN
Any comparison with NULL results in UNKNOWN, like:
NULL = NULL → UNKNOWN
column_name = NULL → UNKNOWN
And in a WHERE clause:
* Only TRUE rows are returned
* FALSE + UNKNOWN are ignored
👉 So result = no rows
❌ Why other options are wrong:
* A. All NULL rows ❌
This would only happen with IS NULL, not = NULL
* C. Error ❌
Query is syntactically valid, so no error
* D. All rows ❌
Condition is never TRUE
💡 Interview Insight
This is one of the most commonly failed SQL questions.
Most people think:
“NULL = NULL should be TRUE”
But in SQL:
NULL is not equal to anything — not even itself
#sql #database #learncoding #codinginterview #learnsql
[SQL NULL behavior, SQL interview question, SQL tricky question, NULL comparison SQL, IS NULL vs equals, SQL three valued logic, SQL WHERE clause NULL, database interview concepts, SQL basics mistakes, SQL filtering NULL, SQL unknown value logic, SQL query pitfalls, DBMS interview questions, SQL learning, SQL concepts explained]
@console.laugh
22.9K
BYSql null and not null values . Important sql topics
@bytebyud
228.9K
DEAll SQl Join Methods || Save For Later 📲
Boost your web dev skills 🧑💻
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Learn Coding Frontend development, web development, HTML, CSS, JavaScript, React, Python
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@de.code.dev
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RIDon’t understand JOINs in SQL?
This will be the last time🔥
#sql #rishabhdaliya
@rishabhdaliyaa
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GOSQL -14 Series Concept Simplified: What is NULL?
In SQL, NULL doesn’t mean zero… doesn’t mean “no”… it simply means blank or unknown value.
EX: Think of it like this👇
A police officer asks a thief:
✔️ “Did you steal the laptop?”
Yes → Clear answer
No → Clear answer
(Silent… no answer) → This silence = NULL
NULL means:
🔸 No data
🔸 No response
🔸 Unknown value
🔸 Not equal to zero, not equal to empty text
👉 Whenever a field has nothing, SQL automatically stores NULL.
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@goonlinetrainings
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DAnobody talks about SQL but it is one of the most requested skills in every data, backend, and analytics job posting right now. if you can write a clean query you are already ahead of half the applicants. save this and actually start this week because this one skill alone has landed people six figure jobs. #sql #datascience #machinelearning #ai #cs
@darshcoded
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COThis 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 }
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#Databases
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#SystemDesign
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@codemeetstech
1.8M
CO4 Websites To Gamify Learning SQL 👾
COMMENT “SQL” if you want the links 👇
🔺SQL Squid Game, one of the most creative ways to practice SQL I’ve seen. You work through challenges inspired by Squid Game while leveling up your query skills.
🕵️ SQL Murder Mystery, solve a crime by using real SQL commands to uncover clues, suspects, and evidence. Learning feels like detective work instead of homework.
🏝️ Lost at SQL, short mystery-style challenges that are fun, beginner-friendly, and actually addictive to play. Perfect if normal tutorials feel dry.
🔍SQL Noir, step into a detective world where you solve cases through SQL queries. Super polished, immersive, and a fun way to sharpen database skills.
Comment SQL if you want the links 👇
📌 SAVE this for later!
✅ FOLLOW for more helpful coding resources!
#computerscience #compsci #programming #coding #sql
@compskyy
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