SQL - Advanced Window Functions
What result does the SQL function
NTH_VALUE(column, n) produce when applied with an OVER() clause in a query?What result does the SQL function NTH_VALUE(column, n) produce when applied with an OVER() clause in a query?
easy📝 Conceptual Q1 of 15
Step-by-Step Solution
Solution:
Step 1: Understand NTH_VALUE
The function returns the value of the nth row in the window frame defined by the OVER() clause.Step 2: Analyze the options
Only It returns the value of the nth row in the ordered window partition. correctly describes this behavior; others describe aggregate or unrelated functions.Final Answer:
It returns the value of the nth row in the ordered window partition. -> Option CQuick Check:
NTH_VALUE returns a specific row's value in the window [OK]
Quick Trick: NTH_VALUE returns the nth row's value in the window [OK]
Common Mistakes:
- Confusing NTH_VALUE with aggregate functions like SUM or AVG
- Assuming it returns a calculation rather than a specific row's value
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