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> Aggregate function that calculates the maximum number of times that a group of intervals intersects each other (if all the intervals intersect at least once).

# maxIntersections

<h2 id="maxIntersections">
  maxIntersections
</h2>

Introduced in: v20.1.0

Aggregate function that calculates the maximum number of times that a group of intervals intersects each other (if all the intervals intersect at least once).

**Syntax**

```sql theme={null}
maxIntersections(start_column, end_column)
```

**Arguments**

* `start_column` — A numeric column that represents the start of each interval. If `start_column` is `NULL` or 0 then the interval will be skipped. [`(U)Int*`](/reference/data-types/int-uint) or [`Float*`](/reference/data-types/float)
* `end_column` — A numeric column that represents the end of each interval. If `end_column` is `NULL` or 0 then the interval will be skipped. [`(U)Int*`](/reference/data-types/int-uint) or [`Float*`](/reference/data-types/float)

**Returned value**

Returns the maximum number of intersected intervals. [`UInt64`](/reference/data-types/int-uint)

**Examples**

**Calculating maximum intersections**

```sql title=Query theme={null}
CREATE TABLE my_events (
    start UInt32,
    end UInt32
)
ENGINE = MergeTree
ORDER BY tuple();

INSERT INTO my_events VALUES
(1, 3),
(1, 6),
(2, 5),
(3, 7);

SELECT maxIntersections(start, end) FROM my_events;
```

```response title=Response theme={null}
┌─maxIntersections(start, end)─┐
│                            3 │
└──────────────────────────────┘
```