8.5K
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
Dünyanın dört bir yanından insanlardan Null In Sql hakkında Reels videosu izle.
Giriş yapmadan anonim olarak izle.
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MASQL in 30 Day 7: NULL Values
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@marytheanalyst
4.2K
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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DADay 23 SQL 🔥| NULL Confusion Ends Here
SAVE this and SHARE with your Data Analyst batch!
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👉 www.youtube.com/@DataXOdyssey
❌ Wrong way (returns no rows)
SELECT * FROM employees
WHERE Country = NULL;
✅ Correct way to check missing country
SELECT * FROM employees
WHERE Country IS NULL;
🎯 Interview Question:
Find employees whose salary is missing but country has already been assigned
SELECT * FROM employees
WHERE Salary IS NULL
AND Country IS NOT NULL;
Key concept every SQL learner must know 👇
NULL ≠ 0
NULL ≠ blank
NULL means missing / unknown value
This single concept avoids 90% beginner SQL mistakes.
📌 How do NULL values get into a table?
• When a value is not entered while adding a record
• When a column is skipped during data insertion
• When an existing value is removed later
• When the information is unknown or not available yet
👉 In SQL, missing or unknown data is stored as NULL
🔁 Save this
❤️ Like for more
📌 Follow for daily SQL learning
🔁 DAY SERIES FLOW
👉 Check Out Day 22: DISTINCT vs COUNT(DISTINCT) 💡
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EMComment “SQL” to get links!
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@emrcodes
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AF📘 SQL Day 32 – Handling NULL Properly (Most Ignored Concept)
“NULL is not ZERO. Not EMPTY. Not FALSE.” ⚠️
Content:
• = NULL ❌ (Wrong)
• Use IS NULL ✅
• COUNT(column) ignores NULL
• COUNT(*) counts all rows
• Use COALESCE() to replace NULL
Example:
SELECT COALESCE(bonus, 0)
FROM employees;
Interview Tip:
Many wrong answers happen because of NULL confusion.
Save this — it will save your interview 💯
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FRNull in JavaScript: Primitive or Object? 🤔🔎
Learn more in our "JavaScript: From First Steps to Professional" course
#JavaScript #WebDev #Programming #Coding #LearnToCode
@frontendmasters
135
DAUnderstanding NULL in SQL
NULL is trickier than it looks in SQL!
Don’t let it break your queries
#SQLTricks #NullValues #DataScience #SQLMastery
@datagoacademy
4.8K
COThis is a simple but tricky SQL interview question.
Why does COUNT(column) ignore NULL values?
1️⃣ NULL means “unknown”
In SQL, NULL is not a value.
It represents missing or unknown data.
⸻
2️⃣ COUNT(column) counts actual values
COUNT(column) only counts rows
where the column has a real (non-NULL) value.
Example:
SELECT COUNT(email) FROM users;
If 3 emails are NULL → they are not counted.
3️⃣ Difference from COUNT(*)
•COUNT(*) → counts all rows
•COUNT(column) → counts only non-NULL values
4️⃣ Why this behavior exists
Aggregations in SQL usually ignore NULLs
to avoid incorrect calculations.
🎯 Interview takeaway
COUNT(column) = count of known values only
NULL is ignored because it’s not a real value.
{ SQL, Databases, BackendDeveloper, SoftwareDevelopment, Programming, DatabaseConcepts, SystemDesign, ComputerScience, TechCareers, InterviewPrep }
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#Databases
#BackendEngineering
#SystemDesign
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@codemeetstech
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NIЧто такое SQL инъекция? #sqlinjection #sql #hacking #hacker #hack #web #website #it #programming #vulnerability #cybersecurity #айти
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CSSQL only has like 10 cmds
@cs.aar0n
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EXSQL Class Day #14 In Telugu | Not Null
Please Follow Us For More Content
This Short is About SQL Class Not Null in Integrity Constraints Day #14 (SQL series) in Telugu for SQL Developers, Data Analyst and Business Analyst. By Srinivas Reddy Excel Telugu Videos
—NOT NULL:
—This Constraint will Not accept null values.
CREATE TABLE EMP1(
EID INT NOT NULL,
ENAME VARCHAR(20),
ESAL INT
)
go
INSERT INTO EMP1 VALUES(101,’SRINIVAS’,22000)
go
INSERT INTO EMP1 (ENAME,ESAL)
VALUES(‘SRIDHAR’,25000)
go
INSERT INTO EMP1 (EID,ESAL) VALUES(103,35000)
go
SP_HELP EMP1
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