[GitHub] [flink] JingsongLi commented on a change in pull request #10733: [FLINK-15446][table][docs] Improve "Connect to External Systems" documentation page

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JingsongLi commented on a change in pull request #10733: [FLINK-15446][table][docs] Improve "Connect to External Systems" documentation page
URL: https://github.com/apache/flink/pull/10733#discussion_r362377424
 
 

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 File path: docs/dev/table/connect.md
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 @@ -500,6 +501,39 @@ rowtime:
 The following watermark strategies are supported:
 
 <div class="codetabs" markdown="1">
+<div data-lang="DDL" markdown="1">
+{% highlight sql %}
+-- Sets a watermark strategy for strictly ascending rowtime attributes. Emits a watermark of the
+-- maximum observed timestamp so far. Rows that have a timestamp smaller to the max timestamp
+-- are not late.
+CREATE TABLE MyTable (
+  ts_field TIMESTAMP(3),
+  WATERMARK FOR ts_field AS ts_field
+) WITH (
+  ...
+)
+
+-- Sets a watermark strategy for ascending rowtime attributes. Emits a watermark of the maximum
+-- observed timestamp so far minus 1. Rows that have a timestamp equal to the max timestamp
+-- are not late.
+CREATE TABLE MyTable (
+  ts_field TIMESTAMP(3),
+  WATERMARK FOR ts_field AS ts_field - INTERVAL '0.001' SECOND
+) WITH (
+  ...
+)
+
+-- Sets a watermark strategy for rowtime attributes which are out-of-order by a bounded time interval.
 
 Review comment:
   It is same to above? Why are out-of-order?

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