xxq250
/
homework-jianmu
1
0
Fork 0
Code Issues Pull Requests 1 Actions Packages Projects Releases Wiki Activity

Merge pull request #2778 from taosdata/updateDocs 

fix some doc errors on website
This commit is contained in:
Shengliang Guan 2020-07-28 10:44:55 +08:00 committed by GitHub
parent 0ff3c75b31 1e46bb51d2
commit 4ef74573d1
No known key found for this signature in database
GPG Key ID: 4AEE18F83AFDEB23
2 changed files with 14 additions and 5 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

4
documentation/webdocs/markdowndocs/TAOS SQL-ch.md
View File

@ -556,7 +556,7 @@ TDengine支持针对数据的聚合查询。提供支持的聚合和选择函数
功能说明：统计表中某列的值百分比分位数。
返回结果数据类型： 双精度浮点数Double。
应用字段：不能应用在timestamp、binary、nchar、bool类型字段。
说明：*k*值取值范围0≤*k*≤100，为0的时候等同于MIN，为100的时候等同于MAX。
说明：*k*值取值范围0≤*P*≤100，为0的时候等同于MIN，为100的时候等同于MAX。
- **APERCENTILE**
```mysql
@ -565,7 +565,7 @@ TDengine支持针对数据的聚合查询。提供支持的聚合和选择函数
功能说明：统计表中某列的值百分比分位数，与PERCENTILE函数相似，但是返回近似结果。
返回结果数据类型： 双精度浮点数Double。
应用字段：不能应用在timestamp、binary、nchar、bool类型字段。
说明：*k*值取值范围0≤*k*≤100，为0的时候等同于MIN，为100的时候等同于MAX。推荐使用```APERCENTILE```函数，该函数性能远胜于```PERCENTILE```函数
说明：*k*值取值范围0≤*P*≤100，为0的时候等同于MIN，为100的时候等同于MAX。推荐使用```APERCENTILE```函数，该函数性能远胜于```PERCENTILE```函数
- **LAST_ROW**
```mysql

15
documentation/webdocs/markdowndocs/TAOS SQL.md
View File

@ -289,10 +289,10 @@ TDengine supports aggregations over numerical values, they are listed below:
Applied to: table/STable.
- **WAVG**
- **TWA**
```mysql
SELECT WAVG(field_name) FROM tb_name WHERE clause
SELECT TWA(field_name) FROM tb_name WHERE clause
```
Function: return the time-weighted average value of a specific column
Return Data Type: `double`
@ -324,7 +324,7 @@ TDengine supports aggregations over numerical values, they are listed below:
- **LEASTSQUARES**
```mysql
SELECT LEASTSQUARES(field_name) FROM tb_name [WHERE clause]
SELECT LEASTSQUARES(field_name, start_val, step_val) FROM tb_name [WHERE clause]
```
Function: performs a linear fit to the primary timestamp and the specified column.
Return Data Type: return a string of the coefficient and the interception of the fitted line.
@ -417,6 +417,15 @@ TDengine supports aggregations over numerical values, they are listed below:
Applied to: table/STable.
Note: The range of `P` is `[0, 100]`. When `P=0` , `PERCENTILE` returns the equal value as `MIN`; when `P=100`, `PERCENTILE` returns the equal value as `MAX`.
- **APERCENTILE**
```mysql
SELECT APERCENTILE(field_name, P) FROM { tb_name | stb_name } [WHERE clause]
```
Function: the value of the specified column below which `P` percent of the data points fall, it returns approximate value of percentile.
Return Data Type: double.
Applicable Data Types: all types except `timestamp`, `binary`, `nchar`, `bool`.
Applied to: table/STable.
Note: The range of `P` is `[0, 100]`. When `P=0` , `APERCENTILE` returns the equal value as `MIN`; when `P=100`, `APERCENTILE` returns the equal value as `MAX`. `APERCENTILE` has a much better performance than `PERCENTILE`.
- **LAST_ROW**
```mysql