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* new refactored panel docs * fixed links * removed xtra sharing link, added links to panel display option tasks * fixed typo * add aliases * incorporate PM feedback * intermediate commit to resolve merge conflict * final changes to resolve merge conflicts
27 lines
879 B
Markdown
27 lines
879 B
Markdown
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title = "Write an expression"
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weight = 20
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aliases = ["/docs/sources/panels/query-a-data-source/use-expressions-to-manipulate-data/write-an-expression/"]
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# Write an expression
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If your data source supports them, then Grafana displays the **Expression** button and shows any existing expressions in the query editor list.
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For more information about expressions, refer to [About expressions]({{< relref "./about-expressions.md" >}}).
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## Before you begin
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- [Add a panel]({{< relref "../../working-with-panels/add-panel.md" >}}).
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**To write an expression**:
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1. Open the panel.
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1. Below the query, click **Expression**.
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1. In the **Operation** field, select the type of expression you want to write.
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For more information about expression operations, refer to [About expressions]({{< relref "./about-expressions.md" >}}).
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1. Write the expression.
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1. Click **Apply**.
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