---
title: "categorical-compound"
slug: "categorical-compound-parser"
updated: 2022-12-13T00:10:55Z
published: 2022-12-13T00:10:55Z
---

> ## 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-compound

The `categorical-compound` **parser** will load data from two or more columns in a source data table and concatenate their values to become multiple categorical **variables** within a **collection**.

```
{
  "parser_type": "categorical-compound", 
  "table_alias": "tata",
  "columns": [
    "ccc1",
    "ccc2"
  ],
  "operator": ", ",
  "collection": "collection_name"
}
```

## columns

**usage: *required*** The `columns` attribute specifies two column names to produce values for concatenation.

## operator

**usage: *optional*** The `operator` attribute specifies the delimiter string to be included between concatenated values and will default to a value of " " (a single-space string).