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Add new functions for workspaces sql docs #26894

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Add new functions for workspaces sql docs #26894

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Add new functions for workspaces sql docs
estherk15 Dec 23, 2024
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Add window functions section
estherk15 Dec 27, 2024
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58 changes: 54 additions & 4 deletions content/en/logs/workspaces/sql_reference.md
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Expand Up @@ -39,12 +39,19 @@
ELSE 'Standard Order'
END AS order_type
FROM orders {{< /code-block >}} |
| `WINDOW` | Performs a calculation across a set of table rows that are somehow related to the current row. | {{< code-block lang="sql" >}}SELECT
timestamp,
service_name,
cpu_usage_percent,
AVG(cpu_usage_percent) OVER (PARTITION BY service_name ORDER BY timestamp ROWS BETWEEN 2 PRECEDING AND CURRENT ROW) AS moving_avg_cpu
FROM
cpu_usage_data {{< /code-block >}} |
| Arithmetic Operations | Performs basic calculations using operators like `+`, `-`, `*`, `/`. | {{< code-block lang="sql" >}}SELECT price, tax, (price * tax) AS total_cost
FROM products {{< /code-block >}} |

## Functions

The following SQL functions are supported:
The following SQL functions are supported. For Window function, see the separate [Window function](#window-functions) section in this documentation.

| Function | Return Type | Description |
|------------------------|---------------------------------|-------------------------------------------------------------------------|
Expand All @@ -60,7 +67,9 @@
| `upper(string s)` | string | Returns the string as uppercase. |
| `abs(numeric n)` | numeric | Returns the absolute value. |
| `coalesce(args a)` | typeof first non-null a OR null | Returns the first non-null value or null if all are null. |

| `cast(value AS type)` | type | Converts the given value to the specified data type. |
| `length(string s)` | integer | Returns the number of characters in the string. |
| `INTERVAL value unit` | interval | Represents a time duration specified in a given unit. |


{{% collapse-content title="Examples" level="h3" %}}
Expand Down Expand Up @@ -136,15 +145,56 @@

### `COALESCE`
{{< code-block lang="sql" >}}
SELECT COALESCE(phone_number, email) AS contact_info
SELECT COALESCE(phone_number, email) AS contact_info
FROM users
{{< /code-block >}}

### `CAST`
{{< code-block lang="sql" >}}
SELECT
CAST(order_id AS VARCHAR) AS order_id_string,
'Order-' || CAST(order_id AS VARCHAR) AS order_label
FROM
orders
{{< /code-block >}}

### `LENGTH`
{{< code-block lang="sql" >}}
SELECT
customer_name,
LENGTH(customer_name) AS name_length
FROM
customers
{{< /code-block >}}

### `INTERVAL`
{{< code-block lang="sql" >}}
SELECT
TIMESTAMP '2023-10-01 10:00:00' + INTERVAL '30 days' AS future_date
{{< /code-block >}}

{{% /collapse-content %}}

## Window Functions

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Datadog.headings 

'Window Functions' should use sentence-style capitalization.

This table provides an overview of the supprted window functions. For comprehensive details and examples, see to the [PostgreSQL documentation][2].

| Function | Return Type | Description |
|-------------------------|-------------------|------------------------------------------------------------------------|
| `OVER` | N/A | Defines a window for a set of rows for other window functions to operate on. |
| `PARTITION BY` | N/A | Divides the result set into partitions, specifically for applying window functions. |
| `RANK()` | integer | Assigns a rank to each row within a partition, with gaps for ties. |
| `ROW_NUMBER()` | integer | Assigns a unique sequential number to each row within a partition. |
| `LEAD(column n)` | typeof column | Returns the value from the next row in the partition. |
| `LAG(column n)` | typeof column | Returns the value from the previous row in the partition. |
| `FIRST_VALUE(column n)` | typeof column | Returns the first value in an ordered set of values. |
| `LAST_VALUE(column n)` | typeof column | Returns the last value in an ordered set of values. |
| `NTH_VALUE(column n, offset)`| typeof column | Returns the value at the specified offset in an ordered set of values. |


## Further reading

{{< partial name="whats-next/whats-next.html" >}}

[1]: /logs/workspaces/#analysis-cell
[1]: /logs/workspaces/#analysis-cell
[2]: https://www.postgresql.org/docs/current/functions-window.html
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