27 lines
701 B
Markdown
27 lines
701 B
Markdown
---
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title: Check if a value exists
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seotitle: Use Flux to check if a value exists
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list_title: Exists
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description: >
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Use the Flux `exists` operator to check if a record contains a key or if that
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key's value is `null`.
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influxdb/cloud/tags: [exists]
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menu:
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influxdb_cloud:
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name: Exists
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parent: Query with Flux
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weight: 220
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related:
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- /influxdb/cloud/query-data/flux/query-fields/
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- /flux/v0/stdlib/universe/filter/
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list_code_example: |
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##### Filter null values
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```js
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data
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|> filter(fn: (r) => exists r._value)
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```
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source: /shared/influxdb-v2/query-data/flux/exists.md
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---
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<!-- The content of this file is at
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// SOURCE content/shared/influxdb-v2/query-data/flux/exists.md--> |