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SetIntersect (NoSQL query)

  • บทความ

APPLIES TO: NoSQL

Compares expressions in two sets and returns the set of expressions that is contained in both sets with no duplicates.

Syntax

SetIntersect(<array_expr_1>, <array_expr_2>)

Arguments

Description
array_expr_1 An array of expressions.
array_expr_2 An array of expressions.

Return types

Returns an array of expressions.

Examples

This first example uses the function with static arrays to demonstrate the intersect functionality.

SELECT VALUE {
    simpleIntersect: SetIntersect([1, 2, 3, 4], [3, 4, 5, 6]),
    emptyIntersect: SetIntersect([1, 2, 3, 4], []),
    duplicatesIntersect: SetIntersect([1, 2, 3, 4], [1, 1, 1, 1]),
    noMatchesIntersect: SetIntersect([1, 2, 3, 4], ["A", "B"]),
    unorderedIntersect: SetIntersect([1, 2, "A", "B"], ["A", 1])
}

[
  {
    "simpleIntersect": [
      3,
      4
    ],
    "emptyIntersect": [],
    "duplicatesIntersect": [
      1
    ],
    "noMatchesIntersect": [],
    "unorderedIntersect": [
      "A",
      1
    ]
  }
]

This last example uses a single item that share values within two array properties.

[
  {
    "name": "Snowilla vest",
    "inStockColors": [
      "Rhino",
      "Finch"
    ],
    "colors": [
      "Finch",
      "Mine Shaft",
      "Rhino"
    ],
    "category": "modern-vests"
  }
]

The query selects the appropriate field from the item[s] in the container.

SELECT
    p.name,
    SetIntersect(p.colors, p.inStockColors) AS availableColors
FROM
    products p
WHERE
    p.category = "modern-vests"

[
  {
    "name": "Snowilla vest",
    "availableColors": [
      "Rhino",
      "Finch"
    ]
  }
]

Remarks

  • This function doesn't return duplicates.
  • This function doesn't use the index.

See also