What is Lag Function in Structured Query Language (SQL)?
What is Lag Function in SQL?
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Chapters:
00:00 - Introduction
00:10 - What is the LAG Function in SQL?
00:20 - How LAG Function Works in SQL
00:37 - Example Setup
00:55 - Practical Example: Data Setup
01:45 - Running the Example
02:39 - Analyzing the Results
02:57 - Real-World Use and Interview Tips
03:25 - Conclusion
We will discuss the LAG function, which is a window function used to access data from preceding rows within a specified window or partition. It helps retrieve values from previous rows based on a defined order.
The LAG function can be applied in scenarios where you need to see the value from a prior row relative to the current row. For example, if you have a sequence of numbers and you need to display the value from the previous row in a new column, the LAG function can achieve this.
The video demonstrates the LAG function with a practical example, showing how to implement it using the PARTITION BY and ORDER BY clauses. The presenter notes that while they rarely used the LAG function in their industry experience, understanding it is important for interviews and practical knowledge.
The video concludes with a reminder to like, share, and subscribe to the Educate Cube YouTube channel.