92 lines
3.2 KiB
Markdown
92 lines
3.2 KiB
Markdown
---
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title: Delete predicate syntax
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list_title: Delete predicate
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description: >
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InfluxDB uses an InfluxQL-like predicate syntax to determine what data points to delete.
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menu:
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influxdb_2_2_ref:
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parent: Syntax
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name: Delete predicate
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weight: 104
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influxdb/v2.2/tags: [syntax, delete]
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related:
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- /influxdb/v2.2/write-data/delete-data/
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- /influxdb/v2.2/reference/cli/influx/delete/
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---
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InfluxDB uses an InfluxQL-like predicate syntax to determine what data
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[points](/influxdb/v2.2/reference/glossary/#point) to delete.
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InfluxDB uses the delete predicate to evaluate the [series keys](/influxdb/v2.2/reference/glossary/#series-key)
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of points in the time range specified in the delete request.
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Points with series keys that evaluate to `true` for the given predicate are deleted.
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Points with series keys that evaluate to `false` are preserved.
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A delete predicate is comprised of one or more [predicate expressions](/influxdb/v2.2/reference/glossary/#predicate-expression).
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The left operand of the predicate expression is the column name.
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The right operand is the column value.
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Operands are compared using [comparison operators](#comparison-operators).
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Use [logical operators](#logical-operators) to combine two or more predicate expressions.
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##### Example delete predicate
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```sql
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key1="value1" AND key2="value"
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```
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{{% warn %}}
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With **InfluxDB {{< current-version >}}**, delete predicates can use any column
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or tag **except** `_time`{{% oss-only %}}, `_field`, {{% /oss-only %}}or `_value`.
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{{% /warn %}}
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## Logical operators
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Logical operators join two or more predicate expressions.
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| Operator | Description |
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|:-------- |:----------- |
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| `AND` | Both left and right operands must be `true` for the expression to be `true`. |
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## Comparison operators
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Comparison operators compare left and right operands and return `true` or `false`.
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| Operator | Description | Example | Result |
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|:-------- |:----------- |:-------: |:------:|
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| `=` | Equal to | `"abc"="abc"` | `true` |
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## Delete predicate examples
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- [Delete points by measurement](#delete-points-by-measurement)
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- {{% cloud-only %}}[Delete points by field](#delete-points-by-field){{% /cloud-only %}}
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- [Delete points by tag set](#delete-points-by-tag-set)
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### Delete points by measurement
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The following will delete points in the `sensorData` measurement:
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```sql
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_measurement="sensorData"
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```
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{{% cloud-only %}}
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### Delete points by field
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The following will delete points with the `temperature` field:
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```sql
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_field="temperature"
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```
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{{% /cloud-only %}}
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### Delete points by tag set
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The following will delete points from the `prod-1.4` host in the `us-west` region:
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```sql
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host="prod-1.4" AND region="us-west"
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```
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## Limitations
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The delete predicate syntax has the following limitations.
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- Delete predicates do not support regular expressions.
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- Delete predicates do not support the `OR` logical operator.
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- Delete predicates only support equality (`=`), not inequality (`!=`).
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- Delete predicates can use any column or tag **except** `_time`
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{{% oss-only %}}, `_field`, {{% /oss-only %}}or `_value`.
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