ClickHouse/docs/en/sql-reference/aggregate-functions/reference/grouparrayintersect.md

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groupArrayIntersect

Return an intersection of given arrays (Return all items of arrays, that are in all given arrays).

Syntax

groupArrayIntersect(x)

Arguments

• x — Argument (column name or expression).

Returned values

• Array that contains elements that are in all arrays.

Type: Array.

Examples

Consider table numbers:

┌─a──────────────┐
│ [1,2,4]        │
│ [1,5,2,8,-1,0] │
│ [1,5,7,5,8,2]  │
└────────────────┘

Query with column name as argument:

SELECT groupArrayIntersect(a) as intersection FROM numbers;

Result:

┌─intersection──────┐
│ [1, 2]            │
└───────────────────┘