AVG (NoSQL query)

The AVG function calculates the average of the values in the expression.

Syntax

AVG(<numeric_expr>)

Arguments

Return types

Returns a numeric scalar value.

Examples

This section contains examples of how to use this query language construct.

Consider this sample set of documents within the Products collection for these examples.

[
  {
    "name": "Diannis Watch",
    "price": 98,
    "detailCategory": "apparel-accessories-watches"
  },
  {
    "name": "Confira Watch",
    "price": 105,
    "detailCategory": "apparel-accessories-watches"
  }
]

Average value for a single property

In this example, the AVG function is used to average the values of the price property into a single aggregated value.

SELECT
  AVG(p.price) AS averagePrice
FROM
  products p
WHERE
  p.detailCategory = "apparel-accessories-watches"

[
  {
    "averagePrice": 101.5
  }
]

Remarks

• This function benefits from the use of a range index. For more information, see range indexes.
• If any arguments in AVG are string, boolean, or null; the entire aggregation system function returns undefined.
• If any argument has an undefined value, that specific value isn't included in the AVG calculation.