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

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slug: /en/sql-reference/aggregate-functions/reference/last_value
sidebar_position: 8
---

# first_value

Selects the last encountered value, similar to `anyLast`, but could accept NULL.


## examples

```sq;
insert into test_data (a,b) values (1,null), (2,3), (4, 5), (6.null)
```

### example1
The NULL value is ignored at default.
```sql
select last_value(b) from test_data
```

```text
┌─last_value(b)─┐
│             5 │
└───────────────┘
```

### example2
The NULL value is ignored.
```sql
select last_value(false)(b) from test_data
```

```text
┌─last_value(false)(b)─┐
│                    5 │
└──────────────────────┘
```

### example3
The NULL value is accepted.
```sql
select last_value(true)(b) from test_data
```

```text
┌─last_value(true)(b)─┐
│                ᴺᵁᴸᴸ │
└─────────────────────┘
```