> For the complete documentation index, see [llms.txt](https://docs.chainargos.com/documentation/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://docs.chainargos.com/documentation/concepts/filters/customizing-filters.md).
# Customizing Filters
Custom filters let you write the fields, constants, functions, and operators for your desired filtering.
ChainArgos also lets you build an expression that evaluates as `TRUE` or `FALSE`. When you run the query, ChainArgos only returns rows for which that condition is `TRUE`.
The `AND/OR` filters enables you to group and use `AND/OR` filter logic without having to manually create filter expressions.
### To get `OR` Logic
Type multiple conditions into the same filter, separated by commas. For example, `today, 7 days ago` means "today or 7 days ago".
### To get `AND` Logic
Type your conditions, one by one, into multiple time filters.
For example, you could:
1. put into a "Block Times" **Block Written Date -> is on or after -> (absolute) -> 2018/01/01** filter;
2. then put "Block Times" **Block Written Date -> is on before -> (relative) -> 2 days** filter.
3. This would mean "January 1st, 2018 and after, **AND** before 2 days ago".
### `AND` / `OR` Logic Combinations
`AND` / `OR` logic can be used to create sophisticated filters to zoom in on a specific data set.
By clicking on the `AND` button, you can easily switch the operator to `OR`, and add additional filters to create a sophisticated series of `AND` / `OR` operators.
Click on the "AND" button to toggle between "AND" or "OR".
Be careful the logic you use for multiple filters does not contradict, otherwise you may get conflicting results, or possibly none at all.
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