DB slow at 3 AM?

A process list shows what’s running. DataQuery shows why: 🔒 blocking chains 📶 connections vs. limit 🔁 replication lag 📦 table sizes ⏱️ cancel any query
Launching very soon 🚀 #buildinpublic #DevOps #SQL

Spin up PostgreSQL & hit your first psql prompt #SQL

Dropping a column in Postgres takes a split second. Finding out who dropped it and why can take hours.

#postgres #database #sql

Today's daily #SQL practice from #DataLemur.

#arithmetic in your SQL query. Here I used a simple query to find out the top three selling drugs at #CVS

datalemur.com/questions/top-…

@NickSinghTech

SQL no se ejecuta en el orden en que lo escribes: FROM → WHERE → GROUP BY → HAVING → SELECT → ORDER BY. Por eso WHERE SUM(...) falla y existe HAVING. Practica con sqlite3, ya viene en Python. #SQL #DataScience

lnkd.in/p/eSmmFtpj
*𝐌𝐲 𝐃𝐚𝐭𝐚 𝐉𝐨𝐮𝐫𝐧𝐞𝐲: 𝟔 𝐖𝐞𝐞𝐤𝐬*
5 SQL lessons:
- 1 comma can break everything
- Data is scattered, JOINs connect it
- You can answer real business Qs
- Handle missing data, don't ignore it
- Slow progress is still progress
#SQL #DataAnalytics

Tu consulta lee 3 millones de filas para devolver 5 🐢
Filtra por una columna sin índice → Seq Scan: lee la tabla entera.
Un CREATE INDEX → Index Scan, directo a la fila ⚡

¿Ya usaste EXPLAIN?

#SQL #PostgreSQL

SQL Developers:

What's wrong with this code?

#SQL

🚀 Day 3/50 : SQL Challenge

🏢 Google freshers level interview question :

Find the TOP 3 highest-paid employees in each department using SQL.

🔥 No AI. No Google. No copying.

💬 Comment your query.

#SQLChallenge #Google #SQL #DataEngineer

【5分でわかる】データベース入門｜SQL・インデックス・トランザクションの仕組みを3DCGで解説 youtu.be/eBPbirKQMXM?si… @YouTubeより #データベース #SQL #プログラミング入門 #IT基礎 #エンジニア

DAY 9/50
#learninginpublic #SQL #Practice

Back to my daily #SQL practice questions.

Today's focus was joining two tables and ordering the results with a limit.

Check it out:
datalemur.com/questions/comp…
#DataLemur #Robinhood @NickSinghTech

So far, I've used SQL to analyze category revenue, identify the top-revenue product, and compare product sales volume with revenue.

I learned something greatly during the course of writing this query that a query can run successfully and still have flawed logic.

#SQL

SQL tip:

Index the columns you JOIN and filter on
Run EXPLAIN before blaming your Java code

Most slow APIs are slow queries.

#SQL #BackendDev

Data Engineering ≠ just pipelines.
Master the essentials:
⚡SCD vs CDC
⚡Spark shuffles & partitions
⚡Medallion architecture
⚡SQL window functions

These are the levers of performance & trust. #DataEngineering #Spark #SQL #Databricks

SQL learning journey 💻🔥

I just completed the Date & Time Functions section of Baraa’s SQL course and challenged myself with 10 practical SQL problems.

I'm sharing the challenges and my solutions. What would you solve first? 👇

#SQL #DataAnalyst

Day 7
Problem: Product Sales Analysis I
#leetcode #sql #consistency

AND outranks OR in SQL. Skip the parentheses and your WHERE clause lets the guilty party slip out the back door. #ghostinthesqldata #sql

المهم بشكل عام الرسم البياني الممتاز هو اللي يفهمه القارئ في وقت قصير بدون ما تشرح له😎📉

#SQL #SQLServer #Python #DataAnalytics #Data_Storytelling

Full Post is on Instagram: instagram.com/p/De4Z9tHk4Tf/…
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#SQL #interview #DataScience #DataAnalytics #ArtificialIntelligence #data #BusinessAnalyst #DataAnalyst #Database #DataEngineering #Tech #rajesh_data_ai #rajesh_umrao
@rajesh_data_ai