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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
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#Null Vs Zero In Sql
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RESQL Zero to Hero..!!
@rengatechnologies
#sql #sqltraining #learnsql #learncoding #coding #sivakasi #kovilpatti
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TONULL vs VACÍO
🔍 ¿Es lo mismo null que “vacío”? ¡NO! y te cuento por qué...
💡 null significa que no hay nada, que algo NO EXISTE, ni siquiera una referencia. Mientras que vacío hace referencia a algo que SI EXISTE, solo que no contiene elementos.
Confundirlos puede traer bugs rarísimos 😵💫 o una serie de excepciones difíciles de tratar. En este short te muestro cómo diferenciarlos y cuándo usar cada uno.
#Java #Null #CleanCode #TodoCode #webdev #AprenderAProgramar #java #JavaEE
@todo_code
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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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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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EMComment “SQL” to get links!
🚀 Want to master SQL without getting bored to tears? This mini roadmap takes you from “what is a database?” to solving complex crimes with code.
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@emrcodes
433.4K
EN🧠 SQL MCQs That Expose Weak Basics 😈
2️⃣2️⃣ COUNT(column) ignores?
❌ Duplicates
❌ Zero
✅ NULL
👉 COUNT(column) ≠ COUNT(*) ⚠️
2️⃣3️⃣ SUM() works on?
❌ Strings
❌ Dates
✅ Numbers
👉 Aggregates need numeric data 🔢
2️⃣4️⃣ AVG() returns?
❌ Total
❌ Max / Min
✅ Mean
👉 SUM ÷ COUNT = AVG 🤯
😳 Small difference… BIG interview impact
💬 Comment your score: 0/3 | 1/3 | 2/3 | 3/3
👥 Tag a friend who confuses COUNT(*) vs COUNT(col) 😅
❤️ Save this for SQL exams & interviews
➡️ Follow for daily SQL MCQs (Placement Focused)
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CSStudents EngineeringLife DeveloperLife 🚀
@engineeringmarathi
600.8K
THSQL enforces structure upfront, while NoSQL lets your data evolve naturally.
#engineering #programming #coding #computerscience #database
@this.girl.tech
5.7K
DADay 24 SQL 🔥| This SQL NULL mistake can fail your interview ❌
IFNULL vs COALESCE explained simply.
SAVE this and SHARE with your Data Analyst batch 📊
📺 Follow on YouTube: Link in Bio
👉 www.youtube.com/@DataXOdyssey
❓ Problem
Your SQL results may look correct — but still be wrong ❌
When data contains NULL, calculations and reports can break…
✅ IFNULL() – Replace NULL with a default value
SELECT IFNULL(Salary, 0) AS Salary
FROM employees;
👉 If Salary is NULL → replace it with 0
👉 Works with only ONE fallback value
✅ COALESCE() – Pick first non-NULL value
SELECT COALESCE(Salary, Bonus, 0) AS Final_Pay
FROM employees;
👉 Checks values from left to right
👉 Returns the first value that is NOT NULL
👉 Can handle multiple columns
🎯 Interview Tip:
Use COALESCE when multiple fallback values are possible
Use IFNULL when logic is simple and limited
🧠 Understand the difference (IMPORTANT 👇)
• IFNULL
✔ Simple
✔ Only 2 arguments
✔ Good when you need one replacement
• COALESCE
✔ More powerful
✔ Multiple arguments
✔ Works across different SQL databases
✔ Preferred in real-world analytics
📌 This is why COALESCE is more flexible than IFNULL
📌 Part of Daily SQL Series – Day 24
🔁 Missed earlier days? Check out previous videos to learn SQL from scratch
🔁 Save this
📌 Follow for daily SQL learning
🔁 DAY SERIES FLOW
👉 Check Out Day 23: NULL vs IS NULL vs IS NOT NULL
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@dataxodyssey
24.5K
DELearn SQL with these videos
By @emrcodes
#coding #programmer #sql
@developers_in
494.9K
ERSQL vs NoSQL: What’s the Difference?
Watch now to see which one suits your needs!
#sql #nosql #database #errormakesclever
@errormakesclever
1.1M
CSSQL only has like 10 cmds
@cs.aar0n
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