#Left Join Sql

🔍 Learn SQL JOINS in 1 image! 📊 4 Types of Joins: 1️⃣ INNER JOIN ➡️ Matches in both 2️⃣ LEFT JOIN ⬅️ All from left + matches 3️⃣ RIGHT JOIN ➡️ All from right + matches 4️⃣ FULL OUTER JOIN 🔄 All from both + NULLs 💻 SELECT smart with SQL! #sql #code #post #oneshort

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Day 8/21 – SQL Challenge Solved 4 SQL questions today, mainly using window functions, self joins, and subqueries. • Rising Temperature: Used LAG() to compare today’s temperature with yesterday’s and filtered where today > previous day. (Also possible using self join with date difference logic.) • Customers Who Never Order: Solved using 1.LEFT JOIN + NULL filter 2.NOT EXISTS subquery • Repeated Payments (DataLemur): Used LAG() to get previous transaction timestamp and calculated time difference. Filtered payments repeated within 10 minutes for same card, merchant, and amount. • Employees Earning More Than Their Manager: Solved using self join on employee_id and manager_id and compared salaries. Key learning: Window functions + self joins make comparison-based problems much easier. Day 9 loading…

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Difference between left join and inner join in SQL #sql #dataanalytics #datascience #dataanalyst #bigdata #programming

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