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Let me add a few Lightstreamer-related notes.

If your aim is to perform one single loop, fetching all the rows of the "data" table at regular times,
so that, upon each row found, you can update...

As far as I am concerned, I can only provide some guidelines, not the actual code.

First of all, the "data" database table should be extended with a third column, which should be declared as a...

I'm not sure if you still need an answer.

So, for now, I just clarify that subscribe tells you when some client needs the updates related with a row; moreover, the supplied item name tells you...

We have never tried to suggest a mapping between relational database concepts and lightstreamer concepts.

As a simple rule:
an item in MERGE mode corresponds to a record in a relational table...