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AVG (NoSQL query)

  • บทความ

APPLIES TO: NoSQL

Returns the average of the values in the expression.

Syntax

AVG(<numeric_expr>)

Arguments

Description
numeric_expr A numeric expression.

Return types

Returns a numeric expression.

Examples

For this example, consider a container with multiple items that each contain a price field.

[
  {
    "name": "Glaark bag",
    "category": "small-bags",
    "price": 20.28
  },
  {
    "name": "Astoney pack",
    "category": "small-bags",
    "price": 5.11
  },
  {
    "name": "Icento pack",
    "category": "small-bags",
    "price": 62.21
  }
]

In this example, the function is used to average the values of a specific field into a single aggregated value.

SELECT VALUE
    AVG(p.price)
FROM 
    products p
WHERE
    p.category = "small-bags"

[
  29.2
]

Remarks

  • This function benefits from a range index.
  • If any arguments in AVG are string, boolean, or null; the entire aggregate system function returns undefined.
  • If any individual argument has an undefined value that value isn't included in the AVG calculation.

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