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Merge pull request #21491 from taosdata/docs/TD-24056 

docs: fix timeline function super table explaination
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dapan1121 2023-05-29 09:55:03 +08:00 committed by GitHub
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9
docs/en/12-taos-sql/10-function.md
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@ -1008,8 +1008,7 @@ SAMPLE(expr, k)
**More explanations**:
This function cannot be used in expression calculation.
- Must be used with `PARTITION BY tbname` when it's used on a STable to force the result on each single timeline
- This function cannot be used in expression calculation.
### TAIL
@ -1088,7 +1087,6 @@ CSUM(expr)
- Arithmetic operation can't be performed on the result of `csum` function
- Can only be used with aggregate functions This function can be used with supertables and standard tables.
- Must be used with `PARTITION BY tbname` when it's used on a STable to force the result on each single timeline
### DERIVATIVE
@ -1112,7 +1110,6 @@ ignore_negative: {
**More explanation**:
- It can be used together with `PARTITION BY tbname` against a STable.
- It can be used together with a selected column. For example: select \_rowts, DERIVATIVE() from.
### DIFF
@ -1175,7 +1172,6 @@ MAVG(expr, k)
- Arithmetic operation can't be performed on the result of `MAVG`.
- Can only be used with data columns, can't be used with tags. - Can't be used with aggregate functions.
- Must be used with `PARTITION BY tbname` when it's used on a STable to force the result on each single timeline
### STATECOUNT
@ -1201,7 +1197,6 @@ STATECOUNT(expr, oper, val)
**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]
- Can't be used with window operation, like interval/state_window/session_window
@ -1229,7 +1224,6 @@ STATEDURATION(expr, oper, val, unit)
**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]
- Can't be used with window operation, like interval/state_window/session_window
@ -1247,7 +1241,6 @@ TWA(expr)
**Applicable table types**: standard tables and supertables
- Must be used together with `PARTITION BY tbname` to force the result into each single timeline.
## System Information Functions

8
docs/zh/12-taos-sql/10-function.md
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@ -1001,7 +1001,6 @@ SAMPLE(expr, k)
**使用说明**：
- 不能参与表达式计算；该函数可以应用在普通表和超级表上；
- 使用在超级表上的时候，需要搭配 PARTITION by tbname 使用，将结果强制规约到单个时间线。
### TAIL
@ -1080,7 +1079,6 @@ CSUM(expr)
- 不支持 +、-、*、/ 运算，如 csum(col1) + csum(col2)。
- 只能与聚合（Aggregation）函数一起使用。 该函数可以应用在普通表和超级表上。
- 使用在超级表上的时候，需要搭配 PARTITION BY tbname使用，将结果强制规约到单个时间线。
### DERIVATIVE
@ -1104,7 +1102,6 @@ ignore_negative: {
**使用说明**:
- DERIVATIVE 函数可以在由 PARTITION BY 划分出单独时间线的情况下用于超级表（也即 PARTITION BY tbname）。
- 可以与选择相关联的列一起使用。 例如: select \_rowts, DERIVATIVE() from。
### DIFF
@ -1167,7 +1164,6 @@ MAVG(expr, k)
- 不支持 +、-、*、/ 运算，如 mavg(col1, k1) + mavg(col2, k1);
- 只能与普通列，选择（Selection）、投影（Projection）函数一起使用，不能与聚合（Aggregation）函数一起使用；
- 使用在超级表上的时候，需要搭配 PARTITION BY tbname使用，将结果强制规约到单个时间线。
### STATECOUNT
@ -1193,7 +1189,6 @@ STATECOUNT(expr, oper, val)
**使用说明**：
- 该函数可以应用在普通表上，在由 PARTITION BY 划分出单独时间线的情况下用于超级表（也即 PARTITION BY tbname）
- 不能和窗口操作一起使用，例如 interval/state_window/session_window。
@ -1221,7 +1216,6 @@ STATEDURATION(expr, oper, val, unit)
**使用说明**：
- 该函数可以应用在普通表上，在由 PARTITION BY 划分出单独时间线的情况下用于超级表（也即 PARTITION BY tbname）
- 不能和窗口操作一起使用，例如 interval/state_window/session_window。
@ -1239,8 +1233,6 @@ TWA(expr)
**适用于**：表和超级表。
**使用说明**： TWA 函数可以在由 PARTITION BY 划分出单独时间线的情况下用于超级表（也即 PARTITION BY tbname）。
## 系统信息函数