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cd14f9ebcb
* split up select.md * array-join.md basic refactoring * distinct.md basic refactoring * format.md basic refactoring * from.md basic refactoring * group-by.md basic refactoring * having.md basic refactoring * additional index.md refactoring * into-outfile.md basic refactoring * join.md basic refactoring * limit.md basic refactoring * limit-by.md basic refactoring * order-by.md basic refactoring * prewhere.md basic refactoring * adjust operators/index.md links * adjust sample.md links * adjust more links * adjust operatots links * fix some links * adjust aggregate function article titles * basic refactor of remaining select clauses * absolute paths in make_links.sh * run make_links.sh * remove old select.md locations * translate docs/es * translate docs/fr * translate docs/fa * remove old operators.md location * change operators.md links * adjust links in docs/es * adjust links in docs/es * minor texts adjustments * wip * update machine translations to use new links * fix changelog * es build fixes * get rid of some select.md links * temporary adjust ru links * temporary adjust more ru links * improve curly brace handling * adjust ru as well * fa build fix * ru link fixes * zh link fixes * temporary disable part of anchor checks
1.6 KiB
1.6 KiB
machine_translated | machine_translated_rev | toc_priority | toc_title |
---|---|---|---|
true | 72537a2d52 |
46 | GenerateRandom |
Generaterandom
GenerateRandom tablo motoru, verilen tablo şeması için rasgele veri üretir.
Kullanım örnekleri:
- Tekrarlanabilir büyük tabloyu doldurmak için testte kullanın.
- Fuzzing testleri için rastgele girdi oluşturun.
ClickHouse sunucusunda kullanım
ENGINE = GenerateRandom(random_seed, max_string_length, max_array_length)
Bu max_array_length
ve max_string_length
parametreler tüm maksimum uzunluğu belirtin
oluşturulan verilerde dizi sütunları ve dizeleri.
Tablo motoru oluşturmak yalnızca destekler SELECT
sorgular.
Tüm destekler Veri türleri dışında bir tabloda saklanabilir LowCardinality
ve AggregateFunction
.
Örnek:
1. Set up the generate_engine_table
Tablo:
CREATE TABLE generate_engine_table (name String, value UInt32) ENGINE = GenerateRandom(1, 5, 3)
2. Verileri sorgula:
SELECT * FROM generate_engine_table LIMIT 3
┌─name─┬──────value─┐
│ c4xJ │ 1412771199 │
│ r │ 1791099446 │
│ 7#$ │ 124312908 │
└──────┴────────────┘
Uygulama Detayları
- Desteklenmiyor:
ALTER
SELECT ... SAMPLE
INSERT
- Dizinler
- Çoğalma