> For the complete documentation index, see [llms.txt](https://dbi-services.gitbook.io/omrun-help/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://dbi-services.gitbook.io/omrun-help/version-4.x/configuration/using-variables/parameter.md).
# Parameter
Parameter variables are used to pass up to four parameters into a query used by [Design Test Object](/omrun-help/version-4.x/element-overview/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.
Like @param3 / @param4 are "not used" it is not necessary to define and use parameters. The @param variables are placeholders within a query and are replaced with the relevant value during run time.
The behavior is the same for all 4 parameters.\
The remark field is important to fill out with unique comments for each row in a parameter list because it is distributed to the OMdashboard.
It is possible to nest any @param into another @param and use it within a query. As an additional benefit a environment variable can also be uses within the parameter list in combination with hardcoded parameter value e.g. XX-\@VAR\_Test\_Env.
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