SQL LEARNING SERIES PART-13

Complete SQL Topics for Data Analysis
-> https://t.me/sqlspecialist/523

Let's also learn about Window Functions today:

Window functions perform calculations across a set of table rows related to the current row. They are particularly useful for analytics and reporting.

#### ROW_NUMBER():
Assigns a unique number to each row within a partition of a result set.

SELECT column1, column2, ROW_NUMBER() OVER (PARTITION BY column3 ORDER BY column4) AS row_num
FROM table_name;

#### RANK(), DENSE_RANK():
Assign ranks to rows based on a specified column, with optional handling of ties.

SELECT column1, column2, RANK() OVER (ORDER BY column3) AS rank_num
FROM table_name;

#### LEAD(), LAG():
Access data from subsequent or previous rows within the result set.

SELECT column1, column2, LEAD(column2) OVER (ORDER BY column1) AS next_value
FROM table_name;

Window functions provide powerful capabilities for comparative and sequential analysis in a dataset.

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Hope it helps :)