# FieldMerge

This Expression constructs a string from a multi-value Databox such as an [Address ](/product-suite/admin/entities/questions/address.md)question, an HTTP Request or a [SQL Query](/product-suite/admin/entities/databoxes/sql-query.md) returning multiple columns with individual column values accessible using the column name.

The syntax of the call is:

1. format - a string containing a string with square bracketed column names to indicate the positions at which the column values should be substituted into the string

<table><thead><tr><th>Expression</th><th>Databox Value</th><th width="88">Result</th><th>Comments</th></tr></thead><tbody><tr><td><code>FieldMerge("[name] ([userId])")</code></td><td>&#x3C;KFXmlValue rows="1">&#x3C;KFRow id="0">&#x3C;userId>1&#x3C;/id>&#x3C;name>George Smiley&#x3C;/name>&#x3C;/KFRow>&#x3C;/KFXmlValue></td><td>George Smiley (1)</td><td>If the databox value has multiple records (as supported by multi-record-set databoxes (Keyfax 4.4.8 only) FieldMerge will return a merge of fields in the first row only.</td></tr><tr><td></td><td></td><td></td><td></td></tr></tbody></table>

{% hint style="info" %}
Using an expression in a databox driven Dynamic List Question (a 4.4.8 feature) that contains a FieldMerge will result in the FieldMerge expression being executed on each row of the Dynamic List Question options. This is an ideal way to format Dynamic List Question options.
{% endhint %}


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# Agent Instructions: Querying This Documentation

If you need additional information that is not directly available in this page, you can query the documentation dynamically by asking a question.

Perform an HTTP GET request on the current page URL with the `ask` query parameter:

```
GET https://docs.keyfax.biz/product-suite/admin/databox-expressions/text-expressions/fieldmerge.md?ask=<question>
```

The question should be specific, self-contained, and written in natural language.
The response will contain a direct answer to the question and relevant excerpts and sources from the documentation.

Use this mechanism when the answer is not explicitly present in the current page, you need clarification or additional context, or you want to retrieve related documentation sections.