Never use SELECT * in production queries. Fetch only the columns you need: ✔ Better performance ✔ Lower memory usage ✔ Cleaner code #SQL
Avoid SELECT * in SQL queries
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One SQL query was slowing down the entire dashboard. Problem: N+1 queries caused 400+ DB calls per page load. Solution: replaced lazy loading with eager loading + added composite indexes. Result: page load time dropped from 4.8s to 900ms.
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Day 50 of Only Hard SQL Challenge. This problem focuses on computing median per user without using built-in functions, along with absolute deviation for each transaction. It highlights: Window functions Ranking within partitions Handling even vs odd cases Careful edge-case consideration 🔗 https://lnkd.in/gyxSdp9P #SQL #DataAnalytics #DataScience #SQLChallenge
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Think you’ve mastered SQL Injection? These challenges say otherwise. 👀 👉 Try them free: https://lnkd.in/dU-jXbAK Real environments. Real exploitation paths. Zero fluff. #sqlinjection #websecurity #infinityplatform #cwl
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Query folding is when Power Query pushes transformations back to the source system (SQL, Fabric, etc.) instead of processing them locally. This is one of the most powerful ways to prevent slowness
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Some days you will open your laptop, stare at a SQL query for an hour, and produce absolutely nothing useful. The query runs.... The result is wrong.... You fix it.... Something else breaks... You start over... At this point you try to reassure yourself that, this is not failure, but the process.. The analysts who get good are not the ones who never struggle. They're the ones who don't close the laptop when they do. Keep going📊 #SQL #DataAnalysis #RealTalk #LearningInPublic #GrowthMindset
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SQL Tip – NULL Handling SQL Tip you must remember 👇 COUNT(column) ignores NULL values COUNT(*) counts all rows This small difference can completely change your analysis results. ✅ Always check NULLs before reporting numbers. #SQL #DataAnalytics #AnalyticsTips
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Quick Vibe Typer update: SQL dictation is now live. Speak your query naturally. The Magic Formatter handles the rest. "select name from users where status equals active" → SELECT name FROM users WHERE status = active; Only kicks in when it detects SQL context, so your regular prose stays untouched. Give it a spin.
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A LEFT JOIN can quietly turn into an INNER JOIN with just one misplaced WHERE condition. ⚠️ Understanding where to apply filters is what separates working SQL from correct SQL. #SQL #DataAnalytics #LearnInPublic
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Views are a feature we have been asked about repeatedly, as they allow you to centralize your business logic rather than hardcoding queries directly into your program. Coming up next: user defined functions
Two SQL features that landed last week: - Full support for Views (temporary and persisted). The views are not materialized, as we already have a feature called “aggregated table” that gives you the benefit of materialized views without the downsides (see here: https://lnkd.in/gHHrRS4R). - SQL Sequence: a lesser-known feature that can come in handy when you need to share across multiple tables a unique numeric value generator. Use case example: a central event ID.
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Two SQL features that landed last week: - Full support for Views (temporary and persisted). The views are not materialized, as we already have a feature called “aggregated table” that gives you the benefit of materialized views without the downsides (see here: https://lnkd.in/gHHrRS4R). - SQL Sequence: a lesser-known feature that can come in handy when you need to share across multiple tables a unique numeric value generator. Use case example: a central event ID.
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