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docs(stream)

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Liu Jicong 2022-12-17 19:11:43 +08:00
parent ba8a65a158
commit ab9c07c420
2 changed files with 4 additions and 4 deletions
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4
docs/en/12-taos-sql/14-stream.md
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@ -78,13 +78,13 @@ create stream if not exists s1 fill_history 1 into st1 as select count(*) from
Combining fill_history option and where clause, stream can processing data of specific time range. For example, only process data after a past time. (In this case, 2020-01-30)
```sql
create stream if not exists s1 fill_history 1 into st1 as select count(*) from t1 where ts > timestamp '2020-01-30' interval(10s)
create stream if not exists s1 fill_history 1 into st1 as select count(*) from t1 where ts > '2020-01-30' interval(10s)
```
As another example, only processing data starting from some past time, and ending at some future time.
```sql
create stream if not exists s1 fill_history 1 into st1 as select count(*) from t1 where ts > timestamp '2020-01-30' and ts < timestamp '2023-01-01 '> interval(10s)
create stream if not exists s1 fill_history 1 into st1 as select count(*) from t1 where ts > '2020-01-30' and ts < '2023-01-01' interval(10s)
```
If some streams are totally outdated, and you do not want it to monitor or process anymore, those streams can be manually dropped and output data will be still kept.

4
docs/zh/12-taos-sql/14-stream.md
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@ -79,13 +79,13 @@ create stream if not exists s1 fill_history 1 into st1 as select count(*) from
结合 fill_history 1 选项，可以实现只处理特定历史时间范围的数据，例如：只处理某历史时刻（2020年1月30日）之后的数据
```sql
create stream if not exists s1 fill_history 1 into st1 as select count(*) from t1 where ts > timestamp '2020-01-30' interval(10s)
create stream if not exists s1 fill_history 1 into st1 as select count(*) from t1 where ts > '2020-01-30' interval(10s)
```
再如，仅处理某时间段内的数据，结束时间可以是未来时间
```sql
create stream if not exists s1 fill_history 1 into st1 as select count(*) from t1 where ts > timestamp '2020-01-30' and ts < timestamp '2023-01-01 '> interval(10s)
create stream if not exists s1 fill_history 1 into st1 as select count(*) from t1 where ts > '2020-01-30' and ts < '2023-01-01' interval(10s)
```
如果该流任务已经彻底过期，并且您不再想让它检测或处理数据，您可以手动删除它，被计算出的数据仍会被保留。