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Quick SQL quiz.
A user signs up, comes back on day 6, then on day 8.
Day-7 retained: yes or no?
Answer in the replies. Try it first, free:
leetdata.ai/problems/day-n-r…
#dataengineering #sql
For engineers in India switching into data engineering:
All 200 leetdata.ai problems are free. SQL, Python, PySpark, hints, editorials. Plus 1 AI mock interview in week 1.
Practice for the rounds DSA prep skips.
leetdata.ai/problems
#dataengineering #sql
Ratings: 4.9, 4.8, 4.7, 4.7, 4.5
ROW_NUMBER: 1 2 3 4 5
RANK: 1 2 3 3 5
DENSE_RANK: 1 2 3 3 4
Ask for a "top 3" with RANK and you get 4 rows.
Top N per Group, free on leetdata.ai:
leetdata.ai/problems/top-n-p…
#dataengineering #sql
Affirm processes billions in credit risk and checkout workflows every day.
How do they handle real-time ML inference without crashing checkout latency?
They built an isolated "Intelligence Layer." 🧵👇
Want daily data engineering breakdowns, system architectures, and paper teardowns sent directly to your phone?
Join our new Data Engineering Weekly WhatsApp Channel! 🚀
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🚀 Apache DataFusion can now leverage Apple Silicon GPUs for massive query speedups!
By registering a single optimizer rule via ArrowMetal, full SQL sorts run 6.9x to 28.8x faster on Apple Silicon—without changing a single line of SQL. 🧵👇
dataengineeringweekly.com/i/…
🛡️ Smart Guardrails:
The rule evaluates warm/idle GPU costs and hand-back cases (e.g., complex float NaNs or streaming Top-K queries where CPU is better).
If conditions aren't optimal or memory limits trigger, it seamlessly falls back to standard CPU execution.
8 SQL problems. About 20 minutes end to end.
leetdata.ai's "Start here" set: the SQL a DE interviewer opens with. CASE WHEN order, BETWEEN bounds, blank vs NULL, a first CTE.
Easy on purpose. Screens slip here.
leetdata.ai/problems
#dataengineering #sql
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#DataEngineering #SQL #PySpark #Career #TechInterviews #LeetData
How do you migrate Europe’s largest data lake without turning the lights off? 💡🛢️
We unpacked Booking.com's massive migration strategy in our latest feature. Read how they pulled it off in Data Engineering Weekly #291! 👇
📖 Article: dataengineeringweekly.com/i/…
📰 Issue #291: dataengineeringweekly.com/p/…
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