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Update 10-function.md

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Ganlin Zhao 2022-07-28 19:50:14 +08:00 committed by GitHub
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docs/en/12-taos-sql/10-function.md
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@ -750,7 +750,7 @@ SELECT HISTOGRAM(field_name，bin_type, bin_description, normalized) FROM tb_nam
**Explanations**：
1. bin_type: parameter to indicate the bucket type, valid inputs are: "user_input", "linear_bin", "log_bin"。
2. bin_description: parameter to describe how to generate buckets，can be in the following JSON formats for each bin_type respectively:
2. bin_description: parameter to describe the rule to generate buckets，can be in the following JSON formats for each bin_type respectively:
- "user_input": "[1, 3, 5, 7]": User specified bin values.
@ -1056,7 +1056,7 @@ SELECT {DIFF(field_name, ignore_negative) | DIFF(field_name)} FROM tb_name [WHER
**More explanations**:
- The number of result rows is the number of rows subtracted by one, no output for the first row.
- It can be used on STable with `PARTITION by tbname`
- It can be used on STable with `PARTITION by tbname`.
### IRATE
@ -1104,7 +1104,7 @@ SELECT IRATE(field_name) FROM tb_name WHERE clause;
SELECT SAMPLE(field_name, K) FROM { tb_name | stb_name } [WHERE clause]
```
**Description**: _k_ sampling values of a specific column. The applicable range of _k_ is [1,1000]
**Description**: _k_ sampling values of a specific column. The applicable range of _k_ is [1,1000].
**Return value type**: Same as the column being operated.
@ -1156,8 +1156,8 @@ SELECT stateDuration(field_name, oper, val, unit) FROM { tb_name | stb_name } [W
**Applicable parameter values**:
- oper : Can be one of "LT" (lower than), "GT" (greater than), "LE" (lower than or euqal to), "GE" (greater than or equal to), "NE" (not equal to), "EQ" (equal to).
- val ： Numeric types.
- unit: The unit of time interval, can be [1s, 1m, 1h], default is 1s.
- val : Numeric types.
- unit : The unit of time interval, can be: 1b(nanosecond), 1u(microsecond),1a(millisecond),1s(second),1m(minute),1h(hour),1d(day),1w(week). If not specified, default is same as the current database time precision in use.
**Return value type**: INTEGER.
@ -1169,8 +1169,8 @@ SELECT stateDuration(field_name, oper, val, unit) FROM { tb_name | stb_name } [W
**More explanations**:
- Must be used together with `PARTITION BY tbname` when it's used on a STable to force the result into each single timeline]
- Cannot be used with window operation, like interval/state_window/session_window
- Must be used together with `PARTITION BY tbname` when it's used on a STable to force the result into each single timeline.
- Cannot be used with window operation, like interval/state_window/session_window.
### TWA