Guys, I am a novice. I use flinksql to write a simple count of user visits according to the document, but it ends after executing it once.

Guys, I'm a novice. I used flinksql to write a simple count of user visits according to the document, but the finish is finished after one execution. What is the reason? The statement is as follows

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Accepted answer 1:

jdbc source is a bounded stream.(This answer is organized from [③group] Apache Flink China community)

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