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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
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GOSQL -14 Series Concept Simplified: What is NULL?
In SQL, NULL doesnβt mean zeroβ¦ doesnβt mean βnoββ¦ it simply means blank or unknown value.
EX: Think of it like thisπ
A police officer asks a thief:
βοΈ βDid you steal the laptop?β
Yes β Clear answer
No β Clear answer
(Silentβ¦ no answer) β This silence = NULL
NULL means:
πΈ No data
πΈ No response
πΈ Unknown value
πΈ Not equal to zero, not equal to empty text
π Whenever a field has nothing, SQL automatically stores NULL.
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DADay 23 SQL π₯| NULL Confusion Ends Here
SAVE this and SHARE with your Data Analyst batch!
πΊ Follow on YouTube: Link in Bio
π www.youtube.com/@DataXOdyssey
β Wrong way (returns no rows)
SELECT * FROM employees
WHERE Country = NULL;
β
Correct way to check missing country
SELECT * FROM employees
WHERE Country IS NULL;
π― 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 π
NULL β 0
NULL β blank
NULL means missing / unknown value
This single concept avoids 90% beginner SQL mistakes.
π How do NULL values get into a table?
β’ When a value is not entered while adding a record
β’ When a column is skipped during data insertion
β’ When an existing value is removed later
β’ When the information is unknown or not available yet
π In SQL, missing or unknown data is stored as NULL
π Save this
β€οΈ Like for more
π Follow for daily SQL learning
π DAY SERIES FLOW
π Check Out Day 22: DISTINCT vs COUNT(DISTINCT) π‘
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EMComment βSQLβ to get links!
π Want to master SQL without getting bored to tears? This mini roadmap takes you from βwhat is a database?β to solving complex crimes with code.
π¨ DrawSQL
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 otherβForeign 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. Youβll race through the basics of SELECT, filtering, and aggregations with instant feedback on your code.
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The ultimate way to practice. There has been a murder in SQL City, and you have to solve it by querying the police database. You will use advanced logic, joins, and wildcards to find the killer. It turns βstudyingβ into a detective game you actually want to play.
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Visualize database architecture like a System Designer
Master the syntax through hands-on repetition
Build real-world problem-solving skills (and have fun doing it)
If you are aiming for Data Analytics or Backend Engineering roles, these 3 tools are your cheat sheet.
π Save this post so you donβt lose the roadmap.
π¬ Comment βSQLβ and Iβll send you the direct links. π Follow for more content on Coding, Data, and Tech Careers.
@emrcodes
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AFπ SQL Day 32 β Handling NULL Properly (Most Ignored Concept)
βNULL is not ZERO. Not EMPTY. Not FALSE.β β οΈ
Content:
β’ = NULL β (Wrong)
β’ Use IS NULL β
β’ COUNT(column) ignores NULL
β’ COUNT(*) counts all rows
β’ Use COALESCE() to replace NULL
Example:
SELECT COALESCE(bonus, 0)
FROM employees;
Interview Tip:
Many wrong answers happen because of NULL confusion.
Save this β it will save your interview π―
@afterhours_rahmat
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FRNull in JavaScript: Primitive or Object? π€π
Learn more in our "JavaScript: From First Steps to Professional" course
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@frontendmasters
135
DAUnderstanding NULL in SQL
NULL is trickier than it looks in SQL!
Donβt 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?
1οΈβ£ NULL means βunknownβ
In SQL, NULL is not a value.
It represents missing or unknown data.
βΈ»
2οΈβ£ 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 β they are not counted.
3οΈβ£ Difference from COUNT(*)
β’COUNT(*) β counts all rows
β’COUNT(column) β counts only non-NULL values
4οΈβ£ Why this behavior exists
Aggregations in SQL usually ignore NULLs
to avoid incorrect calculations.
π― Interview takeaway
COUNT(column) = count of known values only
NULL is ignored because itβs 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
NIΠ§ΡΠΎ ΡΠ°ΠΊΠΎΠ΅ SQL ΠΈΠ½ΡΠ΅ΠΊΡΠΈΡ? #sqlinjection #sql #hacking #hacker #hack #web #website #it #programming #vulnerability #cybersecurity #Π°ΠΉΡΠΈ
@nikidev1
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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
βNOT NULL:
βThis Constraint will Not accept null values.
CREATE TABLE EMP1(
EID INT NOT NULL,
ENAME VARCHAR(20),
ESAL INT
)
go
INSERT INTO EMP1 VALUES(101,βSRINIVASβ,22000)
go
INSERT INTO EMP1 (ENAME,ESAL)
VALUES(βSRIDHARβ,25000)
go
INSERT INTO EMP1 (EID,ESAL) VALUES(103,35000)
go
SP_HELP EMP1
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