mirror of
https://github.com/ClickHouse/ClickHouse.git
synced 2024-11-17 13:13:36 +00:00
d91c97d15d
* Replace underscores with hyphens * remove temporary code * fix style check * fix collapse
43 lines
2.0 KiB
Markdown
43 lines
2.0 KiB
Markdown
---
|
|
toc_priority: 47
|
|
toc_title: generateRandom
|
|
---
|
|
|
|
# generateRandom {#generaterandom}
|
|
|
|
Generates random data with given schema.
|
|
Allows to populate test tables with data.
|
|
Supports all data types that can be stored in table except `LowCardinality` and `AggregateFunction`.
|
|
|
|
``` sql
|
|
generateRandom('name TypeName[, name TypeName]...', [, 'random_seed'[, 'max_string_length'[, 'max_array_length']]]);
|
|
```
|
|
|
|
**Parameters**
|
|
|
|
- `name` — Name of corresponding column.
|
|
- `TypeName` — Type of corresponding column.
|
|
- `max_array_length` — Maximum array length for all generated arrays. Defaults to `10`.
|
|
- `max_string_length` — Maximum string length for all generated strings. Defaults to `10`.
|
|
- `random_seed` — Specify random seed manually to produce stable results. If NULL — seed is randomly generated.
|
|
|
|
**Returned Value**
|
|
|
|
A table object with requested schema.
|
|
|
|
## Usage Example {#usage-example}
|
|
|
|
``` sql
|
|
SELECT * FROM generateRandom('a Array(Int8), d Decimal32(4), c Tuple(DateTime64(3), UUID)', 1, 10, 2) LIMIT 3;
|
|
```
|
|
|
|
``` text
|
|
┌─a────────┬────────────d─┬─c──────────────────────────────────────────────────────────────────┐
|
|
│ [77] │ -124167.6723 │ ('2061-04-17 21:59:44.573','3f72f405-ec3e-13c8-44ca-66ef335f7835') │
|
|
│ [32,110] │ -141397.7312 │ ('1979-02-09 03:43:48.526','982486d1-5a5d-a308-e525-7bd8b80ffa73') │
|
|
│ [68] │ -67417.0770 │ ('2080-03-12 14:17:31.269','110425e5-413f-10a6-05ba-fa6b3e929f15') │
|
|
└──────────┴──────────────┴────────────────────────────────────────────────────────────────────┘
|
|
```
|
|
|
|
[Original article](https://clickhouse.tech/docs/en/query_language/table_functions/generate/) <!--hide-->
|