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Update 10-function.md

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docs/zh/12-taos-sql/10-function.md
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@ -1059,6 +1059,11 @@ CSUM(expr)
```sql ```sql
DERIVATIVE(expr, time_interval, ignore_negative) DERIVATIVE(expr, time_interval, ignore_negative)
ignore_negative: {
0
| 1
}
``` ```
**功能说明**：统计表中某列数值的单位变化率。其中单位时间区间的长度可以通过 time_interval 参数指定，最小可以是 1 秒（1s）；ignore_negative 参数的值可以是 0 或 1，为 1 时表示忽略负值。 **功能说明**：统计表中某列数值的单位变化率。其中单位时间区间的长度可以通过 time_interval 参数指定，最小可以是 1 秒（1s）；ignore_negative 参数的值可以是 0 或 1，为 1 时表示忽略负值。