---
title: "categorical-constant"
slug: "categorical-constant-parser"
updated: 2022-07-27T22:51:03Z
published: 2022-07-27T22:51:03Z
---

> ## Documentation Index
> Fetch the complete documentation index at: https://code.tag.bio/llms.txt
> Use this file to discover all available pages before exploring further.

# categorical-constant

The `categorical-constant` **parser** does not load any data from a source data table. On the other hand, it will assign every **entity** identified by its associated **table** object into a single categorical **variable** within a **collection**.

```
{
  "parser_type": "categorical-constant",
  "table_alias": "tata",
  "column": "ccc1",
  "value": "Yes",
  "collection": "collection_name",
  "variable": "variable_name"
}
```

At first, it may seem useless to assign every **entity** into the same categorical **variable**. But it's not *every* **entity** - because this **parser** operates in conjunction with a **table** object, it's possible that the source data table contains rows that only match with a subset of **entities** loaded from the *entity_table*.

Thus, this **parser** is able to flag all entities that were present in an *other_table*.

## value

**usage: *required*** The value attribute becomes the variable name.