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2.0 KiB
2.0 KiB
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.
generateRandom('name TypeName[, name TypeName]...', [, 'random_seed'[, 'max_string_length'[, 'max_array_length']]]);
Parameters
name— Name of corresponding column.TypeName— Type of corresponding column.limit— Number of rows to generate.max_array_length— Maximum array length for all generated arrays. Defaults to10.max_string_length— Maximum string length for all generated strings. Defaults to10.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
SELECT * FROM generateRandom('a Array(Int8), d Decimal32(4), c Tuple(DateTime64(3), UUID)', 1, 10, 2);
┌─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') │
└──────────┴──────────────┴────────────────────────────────────────────────────────────────────┘