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How to Create Clustered and Non-Clustered Index – Syntax and Examples

SQLeasy0.3 min read

**Clustered** (one per table; physical order): CREATE CLUSTERED INDEX idx ON t(col); **Non-clustered**: CREATE NONCLUSTERED INDEX idx ON t(col) INCLUDE (col2, col3). **Clustered**: Determines row storage order; often on PK. **Non-clustered**: Separate structure; pointer to row;...

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Frequency
Low
Asked at 1 company
Category
487
questions in SQL
Difficulty Split
130E|271M|86H
in this category
Total Bank
1,863
across 7 categories
Asked at these companies
Presidio

Why This Question Matters

This easy-level SQL question appears frequently in data engineering interviews at companies like Presidio. While less common, it tests deeper understanding that distinguishes strong candidates.

How to Approach This

Start by clearly defining the core concept being asked about. Interviewers want to see that you understand the fundamentals before diving into implementation details. Structure your answer with a definition, then explain the practical application with a concise example.

Expert Answer
51 words

Clustered (one per table; physical order): CREATE CLUSTERED INDEX idx ON t(col); Non-clustered: CREATE NONCLUSTERED INDEX idx ON t(col) INCLUDE (col2, col3). Clustered: Determines row storage order; often on PK. Non-clustered: Separate structure; pointer to row; INCLUDE for covering index. Trade-off: Clustered affects insert location; too many non-clustered = write overhead.

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