SQL - Advanced Window Functions
What does the SQL function
FIRST_VALUE(column_name) OVER (ORDER BY column_name) return?What does the SQL function FIRST_VALUE(column_name) OVER (ORDER BY column_name) return?
easy📝 Conceptual Q11 of 15
Step-by-Step Solution
Solution:
Step 1: Understand FIRST_VALUE function
It returns the first value in the ordered set of rows defined by the OVER clause.Step 2: Analyze the ORDER BY clause
The ORDER BY inside OVER() defines the order to pick the first value from.Final Answer:
The first value in the ordered set of rows for that column -> Option BQuick Check:
FIRST_VALUE returns first row value [OK]
Quick Trick: FIRST_VALUE picks the first row after ordering [OK]
Common Mistakes:
- Confusing FIRST_VALUE with LAST_VALUE
- Thinking it returns an aggregate like average
- Ignoring the ORDER BY inside OVER()
Master "Advanced Window Functions" in SQL
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