grafana/docs/sources/panels/transformations/prereq.md

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title = "Prerequisites"
type = "docs"
[menu.docs]
identifier = "transformations_prerequisites"
parent = "transformations"
weight = 300
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# Prerequisites
Before you can configure and apply transformations:
- You must have entered a query and returned data from a data source. For more information on queries, refer to [Queries]({{< relref "../queries.md" >}}).
- You must have applied a visualization that supports queries. Examples are:
- [Bar gauge]({{< relref "../visualizations/bar-gauge-panel.md" >}})
- [Gauge]({{< relref "../visualizations/gauge-panel.md" >}})
- [Graph]({{< relref "../visualizations/graph-panel.md" >}})
- [Heatmap]({{< relref "../visualizations/heatmap.md" >}})
- [Logs]({{< relref "../visualizations/logs-panel.md" >}})
- [Stat]({{< relref "../visualizations/stat-panel.md" >}})
- [Table]({{< relref "../visualizations/table-panel.md" >}})