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[IOTDB-1243]update DML delete grammar doc #3507

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Merged
HTHou merged 1 commit into from
Jul 5, 2021
Merged

[IOTDB-1243]update DML delete grammar doc #3507

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5 changes: 2 additions & 3 deletions docs/UserGuide/IoTDB-SQL-Language/DML-Data-Manipulation-Language.md
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Original file line number Diff line number Diff line change
Expand Up @@ -1562,11 +1562,10 @@ or
```
delete from root.ln.wf02.wt02.* where time <= 2017-11-01T16:26:00;
```
It should be noted that when the deleted path does not exist, IoTDB will give the corresponding error prompt as shown below:

It should be noted that when the deleted path does not exist, IoTDB will not prompt that the path does not exist, but that the execution is successful, because SQL is a declarative programming method. Unless it is a syntax error, insufficient permissions and so on, it is not considered an error, as shown below:
```
IoTDB> delete from root.ln.wf03.wt02.status where time < now()
Msg: TimeSeries does not exist and its data cannot be deleted
Msg: The statement is executed successfully.
```

### Delete Time Partition (experimental)
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4 changes: 2 additions & 2 deletions docs/zh/UserGuide/IoTDB-SQL-Language/DML-Data-Manipulation-Language.md
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Original file line number Diff line number Diff line change
Expand Up @@ -1551,11 +1551,11 @@ delete from root.ln.wf02.wt02 where time <= 2017-11-01T16:26:00;
delete from root.ln.wf02.wt02.* where time <= 2017-11-01T16:26:00;
```

需要注意的是，当删除的路径不存在时，IoTDB会提示路径不存在，无法删除数据，如下所示。
需要注意的是，当删除的路径不存在时，IoTDB不会提示路径不存在，而是显示执行成功，因为SQL是一种声明式的编程方式，除非是语法错误、权限不足等，否则都不认为是错误，如下所示。

```
IoTDB> delete from root.ln.wf03.wt02.status where time < now()
Msg: TimeSeries does not exist and its data cannot be deleted
Msg: The statement is executed successfully.
```

### 删除时间分区 (实验性功能)
Expand Down