> For the complete documentation index, see [llms.txt](https://docs.e6data.com/query-engine/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://docs.e6data.com/query-engine/reference/sql-reference/sql-functions.md).

# SQL functions

e6data SQL functions by category - aggregate, array, date and time, JSON, mathematical, string, window, and more.

Reference for the built-in SQL functions e6data supports, grouped by category.

| Category                                                                                                | Functions for                                                     |
| ------------------------------------------------------------------------------------------------------- | ----------------------------------------------------------------- |
| [Aggregate](/query-engine/reference/sql-reference/sql-functions/aggregate.md)                           | Summarizing rows - `SUM`, `AVG`, `COUNT`, and related             |
| [Array](/query-engine/reference/sql-reference/sql-functions/array.md)                                   | Working with array values                                         |
| [Bitwise](/query-engine/reference/sql-reference/sql-functions/bitwise.md)                               | Bit-level operations on integers                                  |
| [Cardinality estimation](/query-engine/reference/sql-reference/sql-functions/cardinality-estimation.md) | Approximate distinct counts                                       |
| [Checksum](/query-engine/reference/sql-reference/sql-functions/checksum.md)                             | Hashing and checksums                                             |
| [Comparison](/query-engine/reference/sql-reference/sql-functions/comparison.md)                         | Comparison operators and predicates                               |
| [Conditional](/query-engine/reference/sql-reference/sql-functions/conditional.md)                       | `CASE`, `COALESCE`, and conditional logic                         |
| [Conversion](/query-engine/reference/sql-reference/sql-functions/conversion.md)                         | Casting between data types                                        |
| [Date and time](/query-engine/reference/sql-reference/sql-functions/date-time.md)                       | Date/time math, extraction, formatting, and time zones            |
| [Generate](/query-engine/reference/sql-reference/sql-functions/generate.md)                             | Generating rows and sequences                                     |
| [Geospatial](/query-engine/reference/sql-reference/sql-functions/geospatial.md)                         | Location data and H3 functions                                    |
| [JSON](/query-engine/reference/sql-reference/sql-functions/json.md)                                     | Parsing and extracting from JSON                                  |
| [Logical operators](/query-engine/reference/sql-reference/sql-functions/logical-operators.md)           | `AND`, `OR`, `NOT`                                                |
| [Mathematical](/query-engine/reference/sql-reference/sql-functions/mathematical.md)                     | Arithmetic, exponential, logarithmic, rounding, and trigonometric |
| [Regex](/query-engine/reference/sql-reference/sql-functions/regex.md)                                   | Regular-expression matching and extraction                        |
| [Statistical](/query-engine/reference/sql-reference/sql-functions/statistical.md)                       | Statistical aggregates                                            |
| [String](/query-engine/reference/sql-reference/sql-functions/string.md)                                 | Text manipulation and pattern matching                            |
| [Struct](/query-engine/reference/sql-reference/sql-functions/struct.md)                                 | Working with struct values                                        |
| [Window](/query-engine/reference/sql-reference/sql-functions/window.md)                                 | Window and analytic functions                                     |

## See also

* [SQL commands](/query-engine/reference/sql-reference/sql-commands.md) - supported SQL statements


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