SQL Server Part2- Intermediate Level

SQL Server Part2- Intermediate Level free download

SQL - Deep dive into fundamentals :Subqueries,Over clause with partition, ReverseRow,Rank,IIF,Offset,fetchNext,Case End

What You’ll Learn – Key SQL Server Concepts (This is our PART2)

• Subqueries (Inner Queries):
  Learn to use queries inside SELECT, FROM, or WHERE to filter and shape your results dynamically.

• Nested Subqueries:
  Understand how to write subqueries inside other subqueries to solve more complex data problems.

• ROW_NUMBER(), RANK(), DENSE_RANK() with OVER():
  Generate row numbers and rankings for each row in a result set using the OVER() clause.

• OVER() with PARTITION BY:
  Reset row numbers or rankings within each group (like department-wise ranks) using PARTITION BY.

• Reverse Row Numbers:
  Create row numbers in descending order using ORDER BY ... DESC within the OVER() function.

• Search Patterns with Wildcards (LIKE, %, _):
  Use pattern-matching to find flexible string matches (e.g., names starting with "A" or ending with "Z").

• RANK() vs. DENSE_RANK():
  Know when to use each ranking function and understand how they handle ties differently.

• IIF(condition, true, false) – Inline IF:
  A shorthand conditional function that lets you return different values based on a condition.

• CASE...WHEN...THEN...ELSE...END:
  Handle multiple conditions within a query — similar to IF...ELSE IF...ELSE logic in programming. Know the difference between these two approaches and which one should you choose when?

• OFFSET and FETCH NEXT:
  Learn how to skip rows and fetch a specific number of rows — useful for pagination and efficient data browsing.