> 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/element-details/test-data-object/query-a-only.md).
# Query A Only
### 
### Abstract
Generally the query consists of two sections (Data Source A and B) but it can be helpful to switch off the checkbox `☑ Data Source B` in some cases:
* Automate a whole process with generation of [OMrun Parameter lists](/omrun-help/element-details/test-program-object/rtl-generator.md).
* Query data for your information only
The result is shown in a single query return set and is not compared with another data source.
OMrun test object data - Query A view
***
### Data Source A
The drop down menu shows all available data sources define in the selected [environment](/omrun-help/element-details/environment.md). It is possible to select any of the defined data sources and query its data to use this result for any reason.
OMrun test object data - Dropdown source A
***
### Outcome and Result
Instead of having two data sets compared the result will be shown als a single data set with all the selected columns of query A.
OMrun test object data - Result source A
***
### Command String Previewer
There is a tooltip when hover over label `Query A`.
The tooltip is activated after 1 second keeping the mouse cursor over the label. After this delay the tooltip shows a preview of the command string (whole query) for about 10 seconds.
* Showing the preview of the command string from query A with extracted (replaced) variables.
* Copies the command string A to the clipboard automaticaly