8.6K
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 Vs Zero In Sql
Mira videos de Reels sobre Null Vs Zero In Sql de personas de todo el mundo.
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RESQL Zero to Hero..!!
@rengatechnologies
#sql #sqltraining #learnsql #learncoding #coding #sivakasi #kovilpatti
@rengatechnologies
24.5K
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
225.9K
DEAll SQl Join Methods || Save For Later 📲
Boost your web dev skills 🧑💻
Follow @de.code.dev for more
@de.code.dev
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Learn Coding Frontend development, web development, HTML, CSS, JavaScript, React, Python
#webdev #frontenddev #learntocode #javascript #reactjs #codinglife #fblifestyle
@de.code.dev
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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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.
🎨 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 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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💬 Comment “SQL” and I’ll send you the direct links. 👉 Follow for more content on Coding, Data, and Tech Careers.
@emrcodes
433.9K
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)
#SQLMCQs #SQLReels #MySQL
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CSStudents EngineeringLife DeveloperLife 🚀
@engineeringmarathi
601.0K
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
24.6K
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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