Question:Explain Query Parameters. 

Answer If the conditions of the query should be entered at the time of execution of query, we specify the query parameter instead of criteria value or constant. Query parameters are specified inside large braces. Thus, when the query is run, the values of parameters are asked and accordingly the records will be presented.
To set query parameter, type the message inside large brackets in the criteria box of required field. To specify data type of parameter you can select Parameter option from Query menu. In the parameter column, type the message entered in Criteria box then, selects the type of the value that the user has to enter when query is executed in the Data Type column from the drop down list. 

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