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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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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!
📺 Follow on YouTube: Link in Bio
👉 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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Stop trying to visualize complex databases in your head. This tool lets you build beautiful Entity Relationship Diagrams (ERDs) just by dragging and dropping. It is the best way to understand how tables relate to each other—Foreign Keys and Joins finally make sense when you can actually see them.
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Perfect if you want to learn by doing, not reading. This site gives you bite-sized, interactive lessons right in your browser. No installation needed. You’ll race through the basics of SELECT, filtering, and aggregations with instant feedback on your code.
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@emrcodes
87.5K
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 💯
@afterhours_rahmat
12.3K
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
#TechExplained
@codemeetstech
656.2K
NIЧто такое SQL инъекция? #sqlinjection #sql #hacking #hacker #hack #web #website #it #programming #vulnerability #cybersecurity #айти
@nikidev1
1.1M
CSSQL only has like 10 cmds
@cs.aar0n
7.2K
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
#sqltelugu #excel #shorts #telugu #excelteluguvideos #mysql #sqltelugu #trending #reels #memes #office
@excelteluguvideos
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