intersection() Function

Function

Copy link to clipboard

intersection( array1, array2 )

Returns only those elements that appear in all of the given arrays.

Parameters

Copy link to clipboard

Returns

Copy link to clipboard

Any Type Array, matching the type of the inputs

Examples

Copy link to clipboard

Find the values that are common in two integer arrays

Copy link to clipboard

intersection({1, 2, 3, 4}, {3, 4, 5, 6}) returns an array with 3, 4

Find the values that are common in two text arrays

Copy link to clipboard

Values are matched case sensitively:

intersection({"a", "b", "A"}, {"a", "c"}) returns an array with a

To match items case insensitively, use the lower() function on both inputs.

A value is returned for each match:

intersection({"a", "b", "a"}, {"a"}) returns an array with a, a

Types of the arrays must match

Copy link to clipboard

intersection({"a"}, {1}) returns the following error message: Invalid types, can only act on data of the same type.

Use either the conversion functions or the cast() function to convert to the appropriate type.

Empty or null arrays

Copy link to clipboard

When one of the arrays is empty, or no common values are found, an empty array of the same type as the inputs is returned:

intersection({1}, tointeger({})) returns an empty integer array.

intersection({"a"}, {"b"}) returns an empty text array.

Null values in the array are matched and returned:

intersection({1, null, 3}, {1, null, 4}) returns an array with 1, <null>

Compare more than two arrays

Copy link to clipboard

An unlimited number of arrays can be compared, and the values common to all of them are returned:

intersection({1, 2}, {2, 3}, {2, 4}) returns an array with 2

Scalar inputs

Copy link to clipboard

Scalar inputs are cast to arrays:

intersection(1, 1) returns an array with 1

Feature compatibility

Copy link to clipboard

The table below lists this function's compatibility with various features in Appian.

Feedback

Copy link to clipboard