Generates an array containing all elements that appear in multiple input arrays, referenced as column names or array literals.

## Basic Usage

**Array literal reference example:**

derive type:single value:ARRAYINTERSECT([["A","B","C"],["A","D","E"]])

**Output:** Generates a single array with a single element:

["A"]

**Column reference example:**

derive type:single value:ARRAYINTERSECT([array1,array2]) as:'intersect_Array'

**Output:** Generates a new `intersect_Array`

column containing a single array listing all of the elements that appear in both `array1`

and `array2`

in order.

## Syntax and Arguments

derive type:single value:ARRAYINTERSECT(array_ref1,array_ref2)

Argument | Required? | Data Type | Description |
---|---|---|---|

array_ref1 | Y | string or array | Name of first column or first array literal to apply to the function |

array_ref2 | Y | string or array | Name of second column or second array literal to apply to the function |

For more information on syntax standards, see Language Documentation Syntax Notes.

### array_ref1, array_ref2

Array literal or name of the array column whose intersection you want to derive. You can intersect two or more array columns together.

**Usage Notes:**

Required? | Data Type | Example Value |
---|---|---|

Yes | Array literal or column reference | `myArray1` , `myArray2` |

## Examples

**Tip:** For additional examples, see Common Tasks.

### Example - Simple intersection example

`ARRAYCONCAT`

- Concatenate multiple arrays together. See ARRAYCONCAT Function.`ARRAYINTERSECT`

- Find the intersection of elements between multiple arrays. See ARRAYINTERSECT Function.`ARRAYCROSS`

- Compute the cross product of multiple arrays. See ARRAYCROSS Function.`ARRAYUNIQUE`

- Generate unique values across multiple arrays. See ARRAYUNIQUE Function.

**Source:**

Code formatting has been applied to improve legibility.

Item | ArrayA | ArrayB |
---|---|---|

Item1 | `["A","B","C"]` | `["1","2","3"]` |

Item2 | `["A","B"]` | `["A","B","C"]` |

Item3 | `["D","E","F"]` | `["4","5","6"]` |

**Transform:**

You can apply the following transforms in the following order. Note that the column names must be different from the transform name, which is a reserved word.

derive type:single value:ARRAYCONCAT([Letters,Numerals]) as:'concat2'

derive type:single value:ARRAYINTERSECT([Letters,Numerals]) as:'intersection2'

derive type:single value:ARRAYCROSS([Letters,Numerals]) as:'cross2'

derive type:single value:ARRAYUNIQUE([Letters,Numerals]) as:'unique2'

**Results:**

Column set 1:

Item | ArrayA | ArrayB | concat2 | intersection2 |
---|---|---|---|---|

Item1 |
| `["1","2","3"]` | `["A","B","C","1","2","3"]` | `[ ]` |

Item2 | `["A","B"]` | `["A","B","C"]` | `["A","B","A","B","C"]` | `["A","B"]` |

Item3 | `["D","E","F"]` | `["4","5","6"]` | `["D","E","F","4","5","6"]` | `[ ]` |

Column set 2:

Item | cross2 | unique2 |
---|---|---|

Item1 | `[["A","1"],["A","2"],["A","3"],["B","1"],["B","2"],["B","3"],["C","1"],["C","2"],["C","3"]]` | `["A","B","C","1","2","3"]` |

Item2 | `[["A","A"],["A","B"],["A","C"],["B","A"],["B","B"],["B","C"]]` | `["A","B","C"]` |

Item3 | ```
[["D","4"],["D","5"],["D","6"],["E","4"],["E","5"],["E","6"],
["F","4"],["F","5"],["F","6"]]
``` | ```
["D","E","F","4","5","6"]
``` |

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