Top Tweets for #advancedsql
Don’t Make this Mistake #sql while solving WINDOW function in #sql
#SQL #DenseRank #SQLInterviewQuestions #WindowFunctions #DataAnalytics #LearnSQL #DataAnalyst #SQLTutorial #AdvancedSQL #DataScienceWithSushant
New episode is out — Views in SQL.
Learn how to turn complex queries into reusable virtual tables.
Watch here:
https://t.co/s01WTRAuMN
#SQL #MySQL #AdvancedSQL #DataAnalytics #TheDataBoy
Query Planning Basics
🧠 How the SQL Query Planner Works
Steps:
1. Parse
2. Rewrite
3. Optimize
4. Execute
Understanding this = faster debugging.
📚 Source:
https://t.co/wwbCM6esVe
#SQL #QueryPlanner #Performance #Database #AdvancedSQL
https://t.co/rzQf2LuvAl
New episode is out — Temporary Tables vs CTEs.
Learn when to use each and how to write more efficient SQL queries.
#sql #mysql #AdvancedSQL #DataAnalytics #TheDataBoy
🔥 Senior Data Analyst Puzzle #2: Window Functions Mastery
Find the second highest salary in each department from an employees table (emp_id, dept, salary).
Bonus: Also show the gap between 1st and 2nd highest.
Hint: RANK() or DENSE_RANK() + CTE.
#AdvancedSQL #DataAnalytics
Learned about Transactions and how they keep data safe and consistent.
Dived into ACID properties:
@ChaiCodeHQ @Hiteshdotcom @piyushgarg_dev
#SQL #AdvancedSQL #Database #BackendDevelopment #LearningJourney
Ranking data in SQL?
Use the right function:
ROW_NUMBER
RANK
DENSE_RANK
#SQL #DataAnalytics #AdvancedSQL
LEFT JOIN is common.
RIGHT and FULL?
Rare — but powerful when needed.
#SQL #DataAnalytics #AdvancedSQL
💰 Understanding Query Cost
Execution plans show:
• Estimated rows
• Cost units
• Join strategies
Lower cost ≠ always faster — test!
#SQL #PerformanceTuning #AdvancedSQL
📊 LAG() & LEAD() Explained
Compare rows without self-join.
LAG(sales) OVER(ORDER BY date)
Used for:
• Growth rate
• Trends
• Forecasting
#SQL #Analytics #AdvancedSQL #DataScience
📊 Horizontal vs Vertical Partitioning
Horizontal → split rows
Vertical → split columns
Used in high-scale systems.
#SQL #DataEngineering #AdvancedSQL
🧠 How to Read an Execution Plan
Look for:
✔ Cost
✔ Scan type
✔ Join type
Execution plan = SQL X-ray.
#SQL #PerformanceTuning #AdvancedSQL
🔒 Database Locks Explained
• Row-level lock
• Table-level lock
Too many locks = blocked queries.
#SQL #Concurrency #Database #AdvancedSQL
📦 Materialized Views
Unlike normal views:
✔ Stores results physically
✔ Faster reads
❌ Needs refresh
#SQL #Performance #AdvancedSQL #Database
⚡ Index Scan vs Sequential Scan
• Seq Scan → reads entire table
• Index Scan → uses index lookup
#SQL #Performance #Indexing #Database #AdvancedSQL
⚡ Keyset Pagination (Seek Method)
Faster than OFFSET for large datasets.
Used in production systems.
#SQL #Scalability #AdvancedSQL
🧠 ROW_NUMBER() for Deduplication
Keeps one row, removes rest — safely.
#SQL #WindowFunctions #AdvancedSQL
🔄 Pivoting Data in SQL
SQL doesn’t always have PIVOT,
but CASE + GROUP BY does the job.
#SQL #DataTransformation #AdvancedSQL
❌ NOT EXISTS = Find Missing Data
Perfect for:
• Customers with no orders
• Products never sold
#SQL #DataAnalysis #AdvancedSQL
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