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# Parameter
Parameter variables are used to pass up to four parameters into a query used by [Design Test Object](/omrun-help/element-details/test-data-object.md).
If using the @param concept within a "WHERE" clauses it is possible to use the same query with different parameters listed in several rows to split information of a big data table into smaller pieces of information.
OMrun test data object screen
The values "1,2,3,4,5" within the red frame will replace the variable `@param1` within the query A at execution time.
The values "1,2,3,4,5" within the yellow frame will replace the variable `@param2` within the query B at execution time.
In this example `@param3` / `@param4` are "not used". It is not necessary to define and use all or any parameters. The @param variables are placeholders within a query and are replaced by the relevant value during run time.
The behavior is the same for all 4 parameters.\
The remark field is important to fill out with a unique comment for each row in a parameter list because it is published to the OMdashboard.
It is possible to nest any @param into another @param and use it within query A and/or B. As an additional benefit a environment variable can also be used within the parameter list in combination with a hardcoded parameter value e.g. XX-\@VAR\_Test\_Env.
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