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Posts avec #learningSQL

#learningSQL

Les posts publics sur X qui utilisent #learningSQL.

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  2. Sir Deffi⚡@DeffiFavour
    Day 8 of #learningSQL 😊 Topic(s) covered 1. WINDOWS RANKING FUNCTION The Ranking functions are used to assign ranks or values to rows of data. The window ranking function must make use of the ORDER BY clause
    Sir Deffi⚡ @DeffiFavour
    Day 7 of #learningSQL 😊 Topic(s) covered 1. WINDOWS function 2. ⁠ Calculating Running and Rolling Totals 1. WINDOWS FUNCTION Also referred to as analytical functions. WINDOWS Function performs calculations (e.g aggregation) on a specific subset of data and return a value(s)
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  3. Sir Deffi⚡@DeffiFavour
    Day 7 of #learningSQL 😊 Topic(s) covered 1. WINDOWS function 2. ⁠ Calculating Running and Rolling Totals 1. WINDOWS FUNCTION Also referred to as analytical functions. WINDOWS Function performs calculations (e.g aggregation) on a specific subset of data and return a value(s)
    80195
  4. Moyiné@Moyineee
    Data Analysis Learning - Part 2 Learning SQL GM guys 👋 Hope you’re good. Today was a very lazy day, but I’m still here 🫠. I learned about JOINS in SQL. There are four types of joins. I’ll explain the ones I learned using Table A and Table B. From my understanding:
    Télécharger
    Moyiné @Moyineee
    Data Analysis Learning - Part 2 Learning SQL GM guys 👋 Hope you’re good. Today, I learned about NULL values in SQL and solved some practice questions.
    315105
  5. Moyiné@Moyineee
    Data Analysis Learning - Part 2 Learning SQL GM guys 👋 Hope you’re good. Today, I learned about NULL values in SQL and solved some practice questions.
    Télécharger
    Moyiné @Moyineee
    Data Analysis Learning - Part 2 Learning SQL GM guys 👋 Hope you’re good. Today, I practiced aggregate functions using practice questions from the SQL video I’m learning from. The first question gave me some trouble, but I solved it after taking a long break.
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  6. Moyiné@Moyineee
    @Moyineee
    3️⃣ INNER JOIN Returns only values that exist in both Table A and Table B. If a value isn’t present in both tables, it won’t be returned. There’s one more join that I didn’t learn today. I’ll continue from this in tomorrow’s lesson.
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  8. Orkun Tahir Aran, PhD@orc_arn
    1⃣Hi everyone, let's start as promised yesterday. A quick note before starting, check @levikul09 for statistics and python related information. These tweets are my notes from @OReillyMedia #LearningSQL book chapter 1. All the credit goes to that book.
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  10. Orkun Tahir Aran, PhD@orc_arn
    Chapter 8: Grouping and Aggregate functions of #LearningSQL @OReillyMedia This thread will be a brief summary and a short one. Let's dive in
    Orkun Tahir Aran, PhD @orc_arn
    Tomorrow I will start to read this gem, part by part every day, and share my notes here. Time to dive deep in #SQL
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  12. Moyiné@Moyineee
    Data Analysis Learning - Part 2 Learning SQL GM guys 👋 Hope you’re good. Today was busy, but I can’t miss a day (working day 😅) if I can. Today, I learned about FULL OUTER JOIN and solved a few practice questions. Explaining it using Table A and Table B:
    Télécharger
    Moyiné @Moyineee
    Data Analysis Learning - Part 2 Learning SQL GM guys 👋 Hope you’re good. Today was a very lazy day, but I’m still here 🫠. I learned about JOINS in SQL. There are four types of joins. I’ll explain the ones I learned using Table A and Table B. From my understanding:
    21474
  13. Moyiné@Moyineee
    @Moyineee
    FULL OUTER JOIN This join returns all the values you want from both Table A and Table B, even when there’s no matching or related value between the tables. That’s what I learned today. Still learning 🌱 Still growing
    Télécharger
    1029
  15. Moyiné@Moyineee
    Data Analysis Learning - Part 2 Learning SQL GM guys 👋 Hope you’re good. Today, I practiced aggregate functions using practice questions from the SQL video I’m learning from. The first question gave me some trouble, but I solved it after taking a long break.
    Télécharger
    Moyiné @Moyineee
    Data Analysis Learning - Part 2 Learning SQL GM guys 👋 Hope you’re good. Today, I learned about Aggregate Functions in SQL: SUM, COUNT, AVG, MAX, MIN.
    125106
  16. Moyiné@Moyineee
    Data Analysis Learning - Part 2 Learning SQL GM guys 👋 Hope you’re good. Today, I learned about Aggregate Functions in SQL: SUM, COUNT, AVG, MAX, MIN.
    Télécharger
    Moyiné @Moyineee
    Data Analysis Learning - Part 2 🧵 Learning SQL Today, I learned about arithmetic operations in SQL. Using SQLite and actual, I practiced: • (+) addition • (-) subtraction • (*) multiplication • (/) division • (%) modulus
    317147
  17. Moyiné@Moyineee
    @Moyineee
    ...everything in the SELECT statement at the same time, so the alias isn’t available yet for another operation like an aggregate function That’s what I learned today Screenshots of my queries are in this thread Still learning 🌱 Still growing 🚀 One step at a time
    Télécharger
    10314
  23. Moyiné@Moyineee
    @Moyineee
    From my understanding, NULL values represent empty cells or fields. Fields that contain nothing at all, not even spaces (like ' '). In general, 0 is greater than NULL, but in some arithmetic operations, NULL can be treated as zero depending on how the operation is handled.
    Télécharger
    20426
  25. Moyiné@Moyineee
    Data Analysis Learning - Part 2 🧵 Learning SQL Today, I learned about arithmetic operations in SQL. Using SQLite and actual, I practiced: • (+) addition • (-) subtraction • (*) multiplication • (/) division • (%) modulus
    Télécharger
    112142
  26. Moyiné@Moyineee
    @Moyineee
    Other key concepts: • GROUP BY - Groups rows that share the same property so aggregate functions can be applied. • HAVING - Filters groups based on aggregate function results. It’s similar to WHERE, but WHERE filters rows, while HAVING filters groups.
    10216
  28. Moyiné@Moyineee
    Data Analyst Learning - Part 2 Learning SQL GM guys, Hope you’re doing great. Here’s a quick update on what’s been happening with me after learning MS Excel.
    Télécharger
    416346
  29. Moyiné@Moyineee
    @Moyineee
    After Excel, I took a short break, started and completed posting my Data Analyst 2026 Roadmap thread series, and then moved on to SQL. I started learning SQL on January 14th, but paused briefly to finish the DA roadmap thread series. I picked SQL back up on the 21st.
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  32. Shrinath Joshi@ImShriJoshi
    💡 SQL learning: Solving a “Repeated Payments” problem. The goal: find payments made at the same merchant, with the same card & amount, within 10 minutes. The key was comparing each transaction with the previous matching transaction. That’s where LAG() comes in. 👇
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  33. Shrinath Joshi@ImShriJoshi
    @ImShriJoshi
    The mental model: GROUP → SORT → LAG → TIME DIFF → FILTER → COUNT LAG() = find the previous row. Key takeaway: whenever a SQL problem says “compare the current row with the previous row”, think LAG(). Small concepts → big improvements. 🚀 #SQL #LearningSQL #100DaysOfCode
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  35. Priyanshu@prynsustwt
    Day4 of #learningSQL in 5 days (Yesterday missed post) - practice more questions - learnt about (row_number, rank, dense_rank) window functions - did easy, medium level leetcode question around that topic - started learning JOINS in sql That's it ✨ See you later 👋
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