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Ravi Sir's Cards
What Is SQL and Why Analysts Need It
Install SQLite and DB Browser (Windows and Mac)
SELECT Basics: Read Rows Without Changing Data
WHERE: Keep Only the Rows You Need
ORDER BY, DISTINCT and Top-N Results
SQL Data Types Analysts Actually Meet
NULL Values: Missing Data Done Right
CASE WHEN: If-Then Logic in SQL
Date and Time Queries for Analysts
Text Functions Analysts Use Daily
Aggregate Functions: SUM, COUNT आणि AVG aggregates MIN MAX
GROUP BY: One Row Per Group
HAVING: Filter Groups After Aggregates
Why Tables Join: Keys and Relationships
INNER JOIN and LEFT JOIN (The Two You Need First)
SQL for Excel Users (Term Map + Side-by-Side)

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INNER JOIN vs LEFT JOIN

INNER JOIN vs LEFT JOIN. INNER JOIN keeps only matching pairs. LEFT JOIN keeps every row of the table after FROM and adds the matches. — Download PNG · Open lesson

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