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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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Orphan key vs missing key

Orphan key vs missing key. Orphan key ची value दुसऱ्या table मधल्या कुठल्याच row शी जुळत नाही. Missing key NULL असतो, म्हणजे त्याची आत्ताची value माहीत नाही. — Download PNG · Open lesson

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