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Update 14-stream.md

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docs/en/12-taos-sql/14-stream.md
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@ -168,3 +168,11 @@ All [scalar functions](../function/#scalar-functions) are available in stream pr
- [unique](../function/#unique)
- [mode](../function/#mode)
## Pause\Resume stream
1.pause stream
PAUSE STREAM [IF EXISTS] stream_name;
If "IF EXISTS" is not specified and the stream does not exist, an error will be reported; If "IF EXISTS" is specified and the stream does not exist, success is returned; If the stream exists, paused all stream tasks.
2.resume stream
RESUME STREAM [IF EXISTS] [IGNORE UNTREATED] stream_name;
If "IF EXISTS" is not specified and the stream does not exist, an error will be reported. If "IF EXISTS" is specified and the stream does not exist, success is returned; If the stream exists, all of the stream tasks will be resumed. If "IGNORE UntREATED" is specified, data written during the pause period of stream is ignored when resuming stream.