Given the table sales with amount values: 10, 20, 30, 40, 50, what is the ntile(3) value for the row with amount = 40 when ordered by amount?

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SQL - Window Functions Fundamentals

Given the table sales with amount values: 10, 20, 30, 40, 50, what is the ntile(3) value for the row with amount = 40 when ordered by amount?

SELECT amount, NTILE(3) OVER (ORDER BY amount) AS tile FROM sales;

Step-by-Step Solution

Solution:

Step 1: Order amounts and assign NTILE(3)
Sorted amounts: 10, 20, 30, 40, 50. NTILE(3) splits 5 rows into 3 groups: first 2 rows in tile 1, next 2 in tile 2, last 1 in tile 3.
Step 2: Find tile for amount 40
Amount 40 is the 4th row, which falls in tile 2.
Final Answer:
2 -> Option A
Quick Check:
Row 4 in 3 groups = tile 2 [OK]

Quick Trick: Divide rows evenly; count position to find tile [OK]

Common Mistakes:

Assuming equal group sizes always
Assigning tile 3 to amount 40 incorrectly
Confusing row position with tile number

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Given the table sales with amount values: 10, 20, 30, 40, 50, what is the ntile(3) value for the row with amount = 40 when ordered by amount?

Step 1: Order amounts and assign NTILE(3)

Step 2: Find tile for amount 40

Final Answer:

Quick Check:

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