---
title: "Difference between CTE vs TEMP TABLE."  
description: "Difference between CTE vs TEMP TABLE."  
author: "Anubhav Sharma"  
published: 2026-05-01  
updated: 2026-05-01  
canonical: https://www.mindstick.com/interview/34499/difference-between-cte-vs-temp-table  
category: "database"  
tags: ["database", "sql server"]  
reading_time: 3 minutes  

---

# Difference between CTE vs TEMP TABLE.

### CTE (Common Table Expression)

- A **temporary result set** defined within a query
- Exists **only during query execution**
- Not stored physically
- Used for **readability, recursion, and complex queries**

## Example:

```plaintext
WITH CTE_Employees AS (
    SELECT Id, Name FROM Employees WHERE Salary > 50000
)
SELECT * FROM CTE_Employees;
```

### TEMP TABLE

- A **physical temporary table** stored in `tempdb`
- Exists for the **session or until dropped**
- Can be indexed, updated, reused multiple times
- Used for **large data processing and multiple operations**

## Example:

```plaintext
CREATE TABLE #TempEmployees (
    Id INT,
    Name VARCHAR(100)
);

INSERT INTO #TempEmployees
SELECT Id, Name FROM Employees;

SELECT * FROM #TempEmployees;
```

## Key Differences

| Feature | CTE | TEMP TABLE |
| --- | --- | --- |
| Storage | Logical (in-memory/query) | Physical (`tempdb`) |
| Scope | Single query | Session / connection |
| Reusability | No | Yes |
| Performance | Faster for small queries | Better for large data |
| Indexing | Not allowed | Allowed |
| Use Case | Readability, recursion | Data manipulation, reuse |

## When to Use

Use **CTE** when:

- You need simple, readable queries
- Working with recursive queries
- One-time data usage

Use **TEMP TABLE** when:

- Handling large datasets
- Reusing data multiple times
- Need indexing or updates

## Final Thought

- **CTE = Lightweight, query-level**
- **TEMP TABLE = Powerful, reusable storage**

## Answers

### Answer by Anubhav Sharma

### CTE (Common Table Expression)

- A **temporary result set** defined within a query
- Exists **only during query execution**
- Not stored physically
- Used for **readability, recursion, and complex queries**

## Example:

```plaintext
WITH CTE_Employees AS (
    SELECT Id, Name FROM Employees WHERE Salary > 50000
)
SELECT * FROM CTE_Employees;
```

### TEMP TABLE

- A **physical temporary table** stored in `tempdb`
- Exists for the **session or until dropped**
- Can be indexed, updated, reused multiple times
- Used for **large data processing and multiple operations**

## Example:

```plaintext
CREATE TABLE #TempEmployees (
    Id INT,
    Name VARCHAR(100)
);

INSERT INTO #TempEmployees
SELECT Id, Name FROM Employees;

SELECT * FROM #TempEmployees;
```

## Key Differences

| Feature | CTE | TEMP TABLE |
| --- | --- | --- |
| Storage | Logical (in-memory/query) | Physical (`tempdb`) |
| Scope | Single query | Session / connection |
| Reusability | No | Yes |
| Performance | Faster for small queries | Better for large data |
| Indexing | Not allowed | Allowed |
| Use Case | Readability, recursion | Data manipulation, reuse |

## When to Use

Use **CTE** when:

- You need simple, readable queries
- Working with recursive queries
- One-time data usage

Use **TEMP TABLE** when:

- Handling large datasets
- Reusing data multiple times
- Need indexing or updates

## Final Thought

- **CTE = Lightweight, query-level**
- **TEMP TABLE = Powerful, reusable storage**


---

Original Source: https://www.mindstick.com/interview/34499/difference-between-cte-vs-temp-table

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