---
title: "PI (Transact-SQL) | Microsoft Docs"
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ms.date: "03/03/2017"
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  - "PI"
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  - "constant value of PI"
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---
# PI (Transact-SQL)
[!INCLUDE[tsql-appliesto-ss2008-all_md](../../includes/tsql-appliesto-ss2008-all-md.md)]

  Returns the constant value of PI.  
  
 ![Topic link icon](../../database-engine/configure-windows/media/topic-link.gif "Topic link icon") [Transact-SQL Syntax Conventions](../../t-sql/language-elements/transact-sql-syntax-conventions-transact-sql.md)  
  
## Syntax  
  
```  
-- Syntax for SQL Server, Azure SQL Database, Azure SQL Data Warehouse, Parallel Data Warehouse  
  
PI ( )  
```  
  
## Return Types  
 **float**  
  
## Examples  
 The following example returns the value of `PI`.  
  
```  
SELECT PI();  
GO  
```  
  
 [!INCLUDE[ssResult](../../includes/ssresult-md.md)]  
  
```  
------------------------  
3.14159265358979  
  
(1 row(s) affected)  
```  
  
## Examples: [!INCLUDE[ssSDWfull](../../includes/sssdwfull-md.md)] and [!INCLUDE[ssPDW](../../includes/sspdw-md.md)]  
 The following example returns the value of `PI`.  
  
```  
SELECT PI();  
GO  
```  
  
 [!INCLUDE[ssResult](../../includes/ssresult-md.md)]  
  
```  
------------------------  
3.14159265358979  
  
(1 row(s) affected)  
```  
  
## See Also  
 [Mathematical Functions (Transact-SQL)](../../t-sql/functions/mathematical-functions-transact-sql.md)