# Conversion functions
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**Important**  
Amazon S3 Select is no longer available to new customers. Existing customers of Amazon S3 Select can continue to use the feature as usual. [Learn more](https://aws.amazon.com/blogs/storage/how-to-optimize-querying-your-data-in-amazon-s3/) 

Amazon S3 Select supports the following conversion function.

**Topics**
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## CAST
](#s3-select-sql-reference-cast)

## CAST
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The `CAST` function converts an entity, such as an expression that evaluates to a single value, from one type to another. 

### Syntax
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```
CAST ( expression AS data_type )
```

### Parameters
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 *`expression`*   
A combination of one or more values, operators, and SQL functions that evaluate to a value.

 *`data_type`*   
The target data type, such as `INT`, to cast the expression to. For a list of supported data types, see [Data types](s3-select-sql-reference-data-types.md).

### Examples
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```
CAST('2007-04-05T14:30Z' AS TIMESTAMP)
CAST(0.456 AS FLOAT)
```