64. FIRST VALUE & LAST VALUE Window Functions in SQL BigQuery - Extracting First and Last Rows
In this video, we explore the FIRST_VALUE() and LAST_VALUE() window functions in SQL BigQuery to retrieve the first and last values of a dataset based on a specified order. These functions are extremely useful for understanding trends, analyzing time-series data, and comparing values across rows.
🔑 What You Will Learn in This Video:
✔️ Introduction to FIRST_VALUE() and LAST_VALUE() functions in BigQuery SQL
✔️ How to use FIRST_VALUE() to get the first value in a partition based on an order
✔️ How to apply LAST_VALUE() to retrieve the last value in a partition
✔️ Practical examples using FIRST_VALUE() and LAST_VALUE() for analyzing sequences, trends, and comparisons
✔️ How to use PARTITION BY and ORDER BY to control the data order for accurate results
✔️ Real-world use cases such as identifying start and end values in time-series analysis and trends
✔️ Differences between FIRST_VALUE() and LAST_VALUE(), and how to optimize them for your queries
By the end of this tutorial, you'll know how to use FIRST_VALUE() and LAST_VALUE() to extract critical information from datasets, helping you unlock insights and trends in your data.
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