#freelancer • 11m
Here are some essential SQL topics for data analysts: 1. Basic Queries: SELECT, FROM, WHERE clauses. 2. Sorting and Filtering: ORDER BY, GROUP BY, HAVING. 3. Joins: INNER JOIN, LEFT JOIN, RIGHT JOIN. 4. Aggregation Functions: COUNT, SUM, AVG, MIN, MAX. 5. Subqueries: Embedding queries within queries. 6. Data Modification: INSERT, UPDATE, DELETE. 7. Indexes: Optimizing query performance. 8. Normalization: Efficient database design. 9. Views: Creating virtual tables for simplified queries. 10. Database Relationships: One-to-One, One-to-Many, Many-to-Many. Window functions are also important: - ROW_NUMBER(): Assigns a unique number to each row. - RANK() and DENSE_RANK(): Rank data with ties handling. - LAG() and LEAD(): Access data from preceding or following rows. - SUM(), AVG(), MIN(), MAX(): Aggregations over a defined window.
Every Dream is Worth... • 3m
Founder: The app is slow. Can we just increase the server size? Backend Dev: So you want to pay more instead of fixing the problem? Founder: ...What's the problem? Backend Dev: Too many database queries, no caching, and inefficient API calls. Fo
See MoreHonorary Mentions - ... • 1y
Business Resource #1 This website is a great tool to do competitor analysis or to understand one company. Here you can see Total Visits, Bounce Rate, Avg Visit Duration, Age Distribution, Gender Distribution and many more things. Data available o
See MoreFull Stack Web Devel... • 6m
Security testing ensures that applications are free from vulnerabilities like SQL Injection, XSS, CSRF, and IDOR. SQL Injection occurs when unsanitized inputs allow attackers to manipulate database queries. This can be mitigated by using parameterize
See MoreBuilding an AI eco-s... • 3m
I feel pride in announcing our Made in India, Real-Time Vector Database - SwarnDB. SwarnDB is a SarthiAI initiative towards an effort to create an end to end eco-system for the future of AI. We tested SwarnDB with 100K vector records of 1536 dime
See MoreHungry? DM me • 1y
Today, saw a webinar Allen conducted, many students were watching it, Allen was promoting their ca and clat classes and forcing children to join them, they were saying again and again, it's too easy to crack ca and join our coaching now in 11th grade
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