🔍 SQL Server Database Constraints Demystified: Boosting Data Integrity and Efficiency 🔍
Understanding database constraints is pivotal for ensuring robust data integrity and improving efficiency in SQL Server. Here's a quick rundown of the key types of constraints every developer should be familiar with:

📌 Types of Constraints:
1-Default constraint
2-Not Null constraint
3-Primary key constraints
4-Foreign Key constraints
5-Unique Key constraints
6-Check constraint
Implementing the right constraints can significantly enhance the reliability and performance of your database. Stay tuned for more insights and best practices! 🚀
Link: https://youtu.be/7gjPhqpRvB0



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🚀 Essential SQL Tips for Beginners! 🚀

Diving into the world of SQL? Here are some vital tips to kickstart your journey and enhance your SQL skills! 👩‍💻👨‍💻

🔹 Primary Key = Unique Key + Not Null constraint 🗝
🔹 Perform case-insensitive search using UPPER() function:
UPPER(customer_name) LIKE 'A%A'
🔹 LIKE operator is for string data types 🧵
🔹 COUNT(*), COUNT(1), COUNT(0) are all equivalent 🧮
🔹 Aggregate functions ignore NULL values 🚫
🔹 MIN, MAX, SUM, AVG, COUNT are for int data types; STRING_AGG is for string data types 📊
🔹 For row-level filtration use WHERE; for aggregate-level filtration use HAVING 🕵️‍♂️
🔹 UNION ALL includes duplicates; UNION excludes duplicates 🔄
🔹 Use UNION ALL if results won't have duplicates 🚫
🔹 Alias the subquery if using columns in the outer select query 📝
🔹 Subqueries can be used with NOT IN condition 🔄
🔹 CTEs are visually better than subqueries; performance-wise they're equivalent 📈
🔹 When joining two tables with one having only one value, use 1=1 for a CROSS JOIN 🤝
🔹 Window functions operate at the ROW level 🪟
🔹 RANK() vs DENSE_RANK(): RANK() skips rank if values are the same 🏅
🔹 EXISTS works on true/false conditions; if the query returns at least one value, the condition is TRUE ✅

👉 If you found these tips helpful, give it a like! 😄
For more insights and updates, follow me and stay tuned!
🌐Link: https://youtu.be/7gjPhqpRvB0
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essential sql interview questions

1 Explain Order of Execution of SQL query
2 Provide a use case for each of the functions Rank, Dense_Rank & Row_Number
3 Write a query to find the cumulative sum/Running Total
4 Find the Most selling product by sales/ highest Salary of employees
5 Write a query to find the 2nd/nth highest Salary of employees
6 Difference between union vs union all
7 Identify if there any duplicates in a table
8 Scenario based Joins question, understanding of Inner, Left and Outer Joins via simple yet tricky question
9 LAG, write a query to find all those records where the transaction value is greater then previous transaction value
10 Rank vs Dense Rank, query to find the 2nd highest Salary of employee ( Ideal soln should handle ties)
11 Write a query to find the Running Difference (Ideal sol'n using windows function)
12 Write a query to display year on year/month on month growth
13 Write a query to find rolling average of daily sign-ups
14 Write a query to find the running difference using self join (helps in understanding the logical approach, ideally this question is solved via windows function)
15Write a query to find the cumulative sum using self join
(helps in understanding the logical approach, ideally this question is solved via windows function
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