> For the complete documentation index, see [llms.txt](https://mariadb.com/docs/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://mariadb.com/docs/server/reference/sql-structure/operators/comparison-operators/interval.md).

# INTERVAL

## Syntax

```bnf
INTERVAL(N0,N1,N2,N3,...)
```

## Description

Returns the index of the last argument that is less than or equal to the first argument, or is NULL.

Returns `0` if `N0 < N1`, `1` if `N1 <= N0 < N2`, `2` if `N2 <= N0 < N3` and so on or `-1` if `N0` is `NULL`. All arguments are treated as integers. It is required that `N1 <= N2 <= N3 <= ... <= Nn` for this function to work correctly because a fast binary search is used.

## Examples

```sql
SELECT INTERVAL(22, 24, 26, 28);
```

```
+--------------------------+
| INTERVAL(22, 24, 26, 28) |
+--------------------------+
|                        0 |
+--------------------------+
```

```sql
SELECT INTERVAL(22, 22, 22, 22, 23);
```

```
+------------------------------+
| INTERVAL(22, 22, 22, 22, 23) |
+------------------------------+
|                            3 |
+------------------------------+
```

```sql
SELECT INTERVAL(25, 24, 26, 28);
```

```
+--------------------------+
| interval(25, 24, 26, 28) |
+--------------------------+
|                        1 |
+--------------------------+
```

```sql
SELECT INTERVAL(27, 24, 26, 28);
```

```
+--------------------------+
| interval(27, 24, 26, 28) |
+--------------------------+
|                        2 |
+--------------------------+
```

```sql
SELECT INTERVAL(27, 25, 26, 27);
```

```
+--------------------------+
| interval(27, 25, 26, 27) |
+--------------------------+
|                        3 |
+--------------------------+
```

```sql
SELECT INTERVAL(23, 1, 15, 17, 30, 44, 200);
```

```
+--------------------------------------+
| INTERVAL(23, 1, 15, 17, 30, 44, 200) |
+--------------------------------------+
|                                    3 |
+--------------------------------------+
```

```sql
SELECT INTERVAL(10, 1, 10, 100, 1000);
```

```
+--------------------------------+
| INTERVAL(10, 1, 10, 100, 1000) |
+--------------------------------+
|                              2 |
+--------------------------------+
```

```sql
SELECT INTERVAL(22, 23, 30, 44, 200);
```

```
+-------------------------------+
| INTERVAL(22, 23, 30, 44, 200) |
+-------------------------------+
|                             0 |
+-------------------------------+
```

```sql
SELECT INTERVAL(10, 2, NULL);
```

```
+-----------------------+
| INTERVAL(10, 2, NULL) |
+-----------------------+
|                     2 |
+-----------------------+
```

<sub>*This page is licensed: GPLv2, originally from*</sub> [<sub>*fill\_help\_tables.sql*</sub>](https://github.com/MariaDB/server/blob/main/scripts/fill_help_tables.sql)

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