> ## Documentation Index
> Fetch the complete documentation index at: https://docs.mindsdb.com/llms.txt
> Use this file to discover all available pages before exploring further.

# Standard Functions

MindsDB supports standard SQL functions via DuckDB and MySQL engines.

## DuckDB Functions

MindsDB executes functions on the underlying DuckDB engine. Therefore, [all DuckDB functions](https://duckdb.org/docs/stable/sql/functions/overview) are supported within MindsDB out of the box.

* [Aggregate Functions](https://duckdb.org/docs/stable/sql/functions/aggregates)
* [Array Functions](https://duckdb.org/docs/stable/sql/functions/array)
* [Bitstring Functions](https://duckdb.org/docs/stable/sql/functions/bitstring)
* [Blob Functions](https://duckdb.org/docs/stable/sql/functions/blob)
* [Date Format Functions](https://duckdb.org/docs/stable/sql/functions/dateformat)
* [Date Functions](https://duckdb.org/docs/stable/sql/functions/date)
* [Date Part Functions](https://duckdb.org/docs/stable/sql/functions/datepart)
* [Enum Functions](https://duckdb.org/docs/stable/sql/functions/enum)
* [Interval Functions](https://duckdb.org/docs/stable/sql/functions/interval)
* [Lambda Functions](https://duckdb.org/docs/stable/sql/functions/lambda)
* [List Functions](https://duckdb.org/docs/stable/sql/functions/list)
* [Map Functions](https://duckdb.org/docs/stable/sql/functions/map)
* [Nested Functions](https://duckdb.org/docs/stable/sql/functions/nested)
* [Numeric Functions](https://duckdb.org/docs/stable/sql/functions/numeric)
* [Pattern Matching](https://duckdb.org/docs/stable/sql/functions/pattern_matching)
* [Regular Expressions](https://duckdb.org/docs/stable/sql/functions/regular_expressions)
* [Struct Functions](https://duckdb.org/docs/stable/sql/functions/struct)
* [Text Functions](https://duckdb.org/docs/stable/sql/functions/text)
* [Time Functions](https://duckdb.org/docs/stable/sql/functions/time)
* [Timestamp Functions](https://duckdb.org/docs/stable/sql/functions/timestamp)
* [Timestamp with Time Zone Functions](https://duckdb.org/docs/stable/sql/functions/timestamptz)
* [Union Functions](https://duckdb.org/docs/stable/sql/functions/union)
* [Utility Functions](https://duckdb.org/docs/stable/sql/functions/utility)
* [Window Functions](https://duckdb.org/docs/stable/sql/functions/window_functions)

## MySQL Functions

MindsDB executes MySQL-style functions on the underlying DuckDB engine. The following functions have been adapted to MySQL-style functions.

String functions:

* [`CHAR`](https://dev.mysql.com/doc/refman/8.4/en/string-functions.html#function_char)
* [`FORMAT`](https://dev.mysql.com/doc/refman/8.4/en/string-functions.html#function_format)
* [`INSTR`](https://dev.mysql.com/doc/refman/8.0/en/string-functions.html#function_instr)
* [`LENGTH`](https://dev.mysql.com/doc/refman/8.4/en/string-functions.html#function_length)
* [`LOCATE`](https://dev.mysql.com/doc/refman/8.4/en/string-functions.html#function_locate)
* [`SUBSTRING_INDEX`](https://dev.mysql.com/doc/refman/8.4/en/string-functions.html#function_substring-index)
* [`UNHEX`](https://dev.mysql.com/doc/refman/8.4/en/string-functions.html#function_unhex)

Date and time functions:

* [`ADDDATE`](https://dev.mysql.com/doc/refman/8.4/en/date-and-time-functions.html#function_adddate)
* <Tooltip tip="The first argument can be either date or datetime, while the second argument must be a time interval in the MySQL format.">[`ADDTIME`](https://dev.mysql.com/doc/refman/8.4/en/date-and-time-functions.html#function_addtime)</Tooltip>
* <Tooltip tip="DuckDB does not recognize time zones provided in digital offset formats like +10:00. Using CONVERT_TZ with these formats may result in errors or unexpected behavior.">[`CONVERT_TZ`](https://dev.mysql.com/doc/refman/8.4/en/date-and-time-functions.html#function_convert-tz)</Tooltip>
* [`CURDATE`](https://dev.mysql.com/doc/refman/8.4/en/date-and-time-functions.html#function_curdate)
* [`CURTIME`](https://dev.mysql.com/doc/refman/8.4/en/date-and-time-functions.html#function_curtime)
* [`DATE_ADD`](https://dev.mysql.com/doc/refman/8.4/en/date-and-time-functions.html#function_date-add)
* <Tooltip tip="There may be issues with week numbers at year boundaries when using the %u and %V specifiers. DuckDB does not provide exact alternatives with the same behavior, so results might differ or be inconsistent in those edge cases.">[`DATE_FORMAT`](https://dev.mysql.com/doc/refman/8.4/en/date-and-time-functions.html#function_date-format)</Tooltip>
* [`DATE_SUB`](https://dev.mysql.com/doc/refman/8.4/en/date-and-time-functions.html#function_date-sub)
* [`DATEDIFF`](https://dev.mysql.com/doc/refman/8.4/en/date-and-time-functions.html#function_datediff)
* [`DAYNAME`](https://dev.mysql.com/doc/refman/8.4/en/date-and-time-functions.html#function_dayname)
* [`DAYOFMONTH`](https://dev.mysql.com/doc/refman/8.4/en/date-and-time-functions.html#function_dayofmonth)
* [`DAYOFWEEK`](https://dev.mysql.com/doc/refman/8.4/en/date-and-time-functions.html#function_dayofweek)
* [`DAYOFYEAR`](https://dev.mysql.com/doc/refman/8.4/en/date-and-time-functions.html#function_dayofyear)
* [`EXTRACT`](https://dev.mysql.com/doc/refman/8.4/en/date-and-time-functions.html#function_extract)
* [`FROM_DAYS`](https://dev.mysql.com/doc/refman/8.4/en/date-and-time-functions.html#function_from-days)
* [`FROM_UNIXTIME`](https://dev.mysql.com/doc/refman/8.4/en/date-and-time-functions.html#function_from-unixtime)
* <Tooltip tip="Both argument must be constant values.">[`GET_FORMAT`](https://dev.mysql.com/doc/refman/8.4/en/date-and-time-functions.html#function_get-format)</Tooltip>
* [`TIMESTAMPDIFF`](https://dev.mysql.com/doc/refman/8.4/en/date-and-time-functions.html#function_timestampdiff)

Other functions:

* [`REGEXP_SUBSTR`](https://dev.mysql.com/doc/refman/8.4/en/regexp.html#function_regexp-substr)
* [`SHA2`](https://dev.mysql.com/doc/refman/8.4/en/encryption-functions.html#function_sha2)