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Merge pull request #6278 from influxdata/docs/add-dynamic-date-filtering-examples 

feat: add dynamic date range filtering examples to WHERE clause
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Jameelah Mercer 2025-09-12 09:05:18 -07:00 committed by GitHub
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@ -96,6 +96,91 @@ less than or equal to `08-19-2019T13:00:00Z`.
{{% /expand %}}
{{< /expand-wrapper >}}
### Filter data by dynamic date ranges
Use date and time functions to filter data by relative time periods that automatically update.
#### Get data from yesterday
```sql
SELECT *
FROM h2o_feet
WHERE "location" = 'santa_monica'
AND time >= DATE_TRUNC('day', NOW() - INTERVAL '1 day')
AND time < DATE_TRUNC('day', NOW())
```
{{< expand-wrapper >}}
{{% expand "View example results" %}}
This query filters data to include only records from the previous calendar day:
- `NOW() - INTERVAL '1 day'` calculates yesterday's timestamp
- `DATE_TRUNC('day', ...)` truncates to the start of that day (00:00:00)
- The range spans from yesterday at 00:00:00 to today at 00:00:00
| level description | location | time | water_level |
| :---------------- | :----------- | :----------------------- | :---------- |
| below 3 feet | santa_monica | 2019-08-18T12:00:00.000Z | 2.533 |
| below 3 feet | santa_monica | 2019-08-18T12:06:00.000Z | 2.543 |
| below 3 feet | santa_monica | 2019-08-18T12:12:00.000Z | 2.385 |
| below 3 feet | santa_monica | 2019-08-18T12:18:00.000Z | 2.362 |
| below 3 feet | santa_monica | 2019-08-18T12:24:00.000Z | 2.405 |
| below 3 feet | santa_monica | 2019-08-18T12:30:00.000Z | 2.398 |
{{% /expand %}}
{{< /expand-wrapper >}}
#### Get data from the last 24 hours
```sql
SELECT *
FROM h2o_feet
WHERE time >= NOW() - INTERVAL '1 day' AND location = 'santa_monica'
```
{{< expand-wrapper >}}
{{% expand "View example results" %}}
This query returns data from exactly 24 hours before the current time. Unlike the "yesterday" example, this creates a rolling 24-hour window that moves with the current time.
| level description | location | time | water_level |
| :---------------- | :----------- | :----------------------- | :---------- |
| below 3 feet | santa_monica | 2019-08-18T18:00:00.000Z | 2.120 |
| below 3 feet | santa_monica | 2019-08-18T18:06:00.000Z | 2.028 |
| below 3 feet | santa_monica | 2019-08-18T18:12:00.000Z | 1.982 |
| below 3 feet | santa_monica | 2019-08-19T06:00:00.000Z | 1.825 |
| below 3 feet | santa_monica | 2019-08-19T06:06:00.000Z | 1.753 |
| below 3 feet | santa_monica | 2019-08-19T06:12:00.000Z | 1.691 |
{{% /expand %}}
{{< /expand-wrapper >}}
#### Get data from the current week
```sql
SELECT *
FROM h2o_feet
WHERE time >= DATE_TRUNC('week', NOW()) AND location = 'santa_monica'
```
{{< expand-wrapper >}}
{{% expand "View example results" %}}
This query returns all data from the start of the current week (Monday at 00:00:00) to the current time. The DATE_TRUNC('week', NOW()) function truncates the current timestamp to the beginning of the week.
| level description | location | time | water_level |
| :---------------- | :----------- | :----------------------- | :---------- |
| below 3 feet | santa_monica | 2019-08-12T00:00:00.000Z | 2.064 |
| below 3 feet | santa_monica | 2019-08-14T09:30:00.000Z | 2.116 |
| below 3 feet | santa_monica | 2019-08-16T15:45:00.000Z | 1.952 |
| below 3 feet | santa_monica | 2019-08-18T12:00:00.000Z | 2.533 |
| below 3 feet | santa_monica | 2019-08-18T18:00:00.000Z | 2.385 |
| below 3 feet | santa_monica | 2019-08-19T10:30:00.000Z | 1.691 |
{{% /expand %}}
{{< /expand-wrapper >}}
### Filter data using the OR operator
```sql