SQL - Advanced Window Functions
Which SQL function would you use to get the last value in a sorted group of rows?
Which SQL function would you use to get the last value in a sorted group of rows?
easy📝 Conceptual Q2 of 15
Step-by-Step Solution
Solution:
Step 1: Identify function for last value
LAST_VALUE() returns the last value in the window frame after sorting.Step 2: Differentiate from aggregate functions
MAX() and MIN() return max/min values but not necessarily the last row's value in order.Final Answer:
LAST_VALUE() -> Option DQuick Check:
LAST_VALUE = last value [OK]
Quick Trick: Use LAST_VALUE() to get last row's value in order [OK]
Common Mistakes:
- Using MAX() instead of LAST_VALUE()
- Confusing FIRST_VALUE() with LAST_VALUE()
- Not specifying ORDER BY in OVER clause
- Assuming MIN() returns last value
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