docs/sql-manual/sql-functions/array-functions/sequence.md

---
{
    "title": "SEQUENCE",
    "language": "en"
}
---

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## sequence

sequence

### description
alias of array_range function

#### Syntax

```sql
ARRAY<Int> sequence(Int end)
ARRAY<Int> sequence(Int start, Int end)
ARRAY<Int> sequence(Int start, Int end, Int step)
ARRAY<Datetime> sequence(Datetime start_datetime, Datetime end_datetime)
ARRAY<Datetime> sequence(Datetime start_datetime, Datetime end_datetime, INTERVAL Int interval_step UNIT)
```
1. To generate array of int:
The parameters are all positive integers. 
start default value is 0, and step default value is 1.
Return the array which numbers from start to end - 1 by step.

2. To generate array of datetime:
At least taking two parameters. 
The first two parameters are all datetimev2, the third is positive integer.
If the third part is missing, `INTERVAL 1 DAY` will be default value.
UNIT supports YEAR/MONTH/WEEK/DAY/HOUR/MINUTE/SECOND.
Return the array of datetimev2 between start_datetime and closest to end_datetime by interval_step UNIT.

### notice

`if the 3rd parameter step/interval_step is negative or zero, the function will return NULL`

### example

```
mysql> select sequence(10);
+--------------------------------+
| sequence(10)                   |
+--------------------------------+
| [0, 1, 2, 3, 4, 5, 6, 7, 8, 9] |
+--------------------------------+

mysql> select sequence(10,20);
+------------------------------------------+
| sequence(10, 20)                         |
+------------------------------------------+
| [10, 11, 12, 13, 14, 15, 16, 17, 18, 19] |
+------------------------------------------+

mysql> select sequence(0,20,2);
+-------------------------------------+
| sequence(0, 20, 2)                  |
+-------------------------------------+
| [0, 2, 4, 6, 8, 10, 12, 14, 16, 18] |
+-------------------------------------+

mysql> select sequence(cast('2022-05-15 12:00:00' as datetimev2(0)), cast('2022-05-17 12:00:00' as datetimev2(0))) AS sequence_default;
+------------------------------------------------+
| sequence_default                               |
+------------------------------------------------+
| ["2022-05-15 12:00:00", "2022-05-16 12:00:00"] |
+------------------------------------------------+

mysql> select sequence(cast('2019-05-15 12:00:00' as datetimev2(0)), cast('2022-05-17 12:00:00' as datetimev2(0)), interval 2 year) as sequence_2_year;
+------------------------------------------------+
| sequence_2_year                                |
+------------------------------------------------+
| ["2019-05-15 12:00:00", "2021-05-15 12:00:00"] |
+------------------------------------------------+
```

### keywords

ARRAY, RANGE, SEQUENCE