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Update TAOS SQL.md

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haojun Liao 2020-07-07 11:51:50 +08:00 committed by GitHub
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@ -412,7 +412,7 @@ TDengine supports aggregations over numerical values, they are listed below:
SELECT PERCENTILE(field_name, P) FROM { tb_name | stb_name } [WHERE clause] SELECT PERCENTILE(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. Function: the value of the specified column below which `P` percent of the data points fall.
Return Data Type: the same data type. Return Data Type: double.
Applicable Data Types: all types except `timestamp`, `binary`, `nchar`, `bool`. Applicable Data Types: all types except `timestamp`, `binary`, `nchar`, `bool`.
Applied to: table/STable. 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`. 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`.
@ -446,7 +446,7 @@ TDengine supports aggregations over numerical values, they are listed below:
SELECT SPREAD(field_name) FROM { tb_name | stb_name } [WHERE clause] SELECT SPREAD(field_name) FROM { tb_name | stb_name } [WHERE clause]
``` ```
Function: return the difference between the maximum and the mimimum value. Function: return the difference between the maximum and the mimimum value.
Return Data Type: the same data type. Return Data Type: double.
Applicable Data Types: all types except `timestamp`, `binary`, `nchar`, `bool`. Applicable Data Types: all types except `timestamp`, `binary`, `nchar`, `bool`.
Applied to: table/STable. Applied to: table/STable.
Note: spread gives the range of data variation in a table/supertable; it is equivalent to `MAX()` - `MIN()` Note: spread gives the range of data variation in a table/supertable; it is equivalent to `MAX()` - `MIN()`