[Solved] Which of the following is the correct syntax to assign quartiles using NTILE in PostgreSQL? — Ans: SELECT column, NTILE(4) OVER (ORDER BY column) AS quartile FROM table; | PostgreSQL

PostgreSQL - Window Functions in PostgreSQL

Which of the following is the correct syntax to assign quartiles using NTILE in PostgreSQL?

ASELECT column, NTILE(4) PARTITION BY column FROM table;

BSELECT column, NTILE OVER (4 ORDER BY column) AS quartile FROM table;

CSELECT column, NTILE(4) AS quartile FROM table ORDER BY column;

DSELECT column, NTILE(4) OVER (ORDER BY column) AS quartile FROM table;

Step-by-Step Solution

Solution:

Step 1: Recall NTILE syntax
The correct syntax is NTILE(n) OVER (ORDER BY column) to assign groups.
Step 2: Check each option
SELECT column, NTILE(4) OVER (ORDER BY column) AS quartile FROM table; uses correct syntax with NTILE(4) OVER (ORDER BY column). Others misuse OVER clause or omit it.
Final Answer:
SELECT column, NTILE(4) OVER (ORDER BY column) AS quartile FROM table; -> Option D
Quick Check:
NTILE needs OVER with ORDER BY [OK]

Quick Trick: NTILE requires OVER and ORDER BY clauses [OK]

Common Mistakes:

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Which of the following is the correct syntax to assign quartiles using NTILE in PostgreSQL?