# SQL 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://amazonaws-china.com/blogs/storage/how-to-optimize-querying-your-data-in-amazon-s3/) 

Amazon S3 Select supports the following SQL functions.

**Topics**
+ [Aggregate functions](s3-select-sql-reference-aggregate.md)
+ [Conditional functions](s3-select-sql-reference-conditional.md)
+ [Conversion functions](s3-select-sql-reference-conversion.md)
+ [Date functions](s3-select-sql-reference-date.md)
+ [String functions](s3-select-sql-reference-string.md)