Using OQL Query fetch data from backend

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  I want to write an OQL query to retrieve date range data I want to pass two parameters for the start date and end date so want need to fetch backend data between those given ranges as parameters how I can write a query for that in the variable Please help  Thanks advance
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2 answers
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See https://service.mendixcloud.com/p/OQL for the oql-playground. To see your requested date example click on button “Where Date < $DateTimeParameter”:

and you will see  a guide how to pass the date parameter.

 

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I still don't understand the clear difference and usage of oql and sql.
Is there a place where I can see a more detailed and kind explanation?

thank you~

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