# LAST\_VALUE

The `LAST_VALUE` function returns the value from the last row in a window. 

### Signature

```sql
LAST_VALUE(expression) [IGNORE NULLS | RESPECT NULLS] OVER ()
```

The default behavior is `RESPECT NULLS`. If the `IGNORE NULLS` option is specified, the function returns the last non-null row in each window (assuming one exists, `null` otherwise).

### Example 1

This example computes the number of games played by a player in their last year.

```sql
SELECT playerName,
  yearID,
  numberOfGames,
  LAST_VALUE(numberOfGames) OVER (
    PARTITION BY playerName
    ORDER BY yearID ROWS BETWEEN UNBOUNDED PRECEDING AND UNBOUNDED FOLLOWING
  )
FROM baseballStats;
```

Output:

<table><thead><tr><th>playerName</th><th>yearID</th><th>numberOfGames</th><th data-type="number">EXPR$3</th></tr></thead><tbody><tr><td>p1</td><td>2000</td><td>10</td><td>12</td></tr><tr><td>p1</td><td>2001</td><td>15</td><td>12</td></tr><tr><td>p1</td><td>2002</td><td>12</td><td>12</td></tr><tr><td>p2</td><td>1990</td><td>120</td><td>124</td></tr><tr><td>p2</td><td>1991</td><td>124</td><td>124</td></tr><tr><td>p3</td><td>2006</td><td>30</td><td>15</td></tr><tr><td>p3</td><td>2007</td><td>25</td><td>15</td></tr><tr><td>p3</td><td>2009</td><td>20</td><td>15</td></tr><tr><td>p3</td><td>2010</td><td>15</td><td>15</td></tr></tbody></table>

### Example 2

This example uses the `IGNORE NULLS` option to "gapfill" missing values (that are represented as `null`). Note that we use the default window frame here which is `RANGE BETWEEN UNBOUNDED PRECEDING AND CURRENT ROW`.

```sql
SELECT ts,
  reading,
  LAST_VALUE(reading) IGNORE NULLS OVER (
    ORDER BY ts
  ) AS imputedReading
FROM telemetryData;
```

Output:

| ts                    | reading | imputedReading |
| --------------------- | ------- | -------------- |
| 2014-01-01 00:00:00.0 | 10.0    | 10.0           |
| 2014-01-01 00:30:00.0 | 12.0    | 12.0           |
| 2014-01-01 01:00:00.0 | 12.5    | 12.5           |
| 2014-01-01 01:30:00.0 | null    | 12.5           |
| 2014-01-01 02:00:00.0 | null    | 12.5           |
| 2014-01-01 02:30:00.0 | 11.5    | 11.5           |
| 2014-01-01 03:00:00.0 | null    | 11.5           |
| 2014-01-01 03:30:00.0 | 11.0    | 11.0           |


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