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Update 10-function.md

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docs/en/12-taos-sql/10-function.md
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@ -1226,7 +1226,7 @@ ignore_option: {
- `3` means that negative values ​​(diff results) are ignored and null values ​​are ignored
- For tables with composite primary key, the data with the smallest primary key value is used to calculate the difference.
**Return value type**: `bool`, `timestamp` type and integer value type all return `int_64`, `floating` point type returns `double`, and if the diff result overflows, it is returned as overflow.
**Return value type**: `bool`, `timestamp` and `integer` value type all return `int_64`, `float` type returns `double`; if the diff result overflows, it is returned as overflow.
**Applicable data types**: Numeric type, timestamp and bool type.