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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
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3.5 KiB
machine_translated | machine_translated_rev | toc_priority | toc_title |
---|---|---|---|
true | 72537a2d52 |
59 | IPv4 |
IPv4
IPv4
est un domaine basé sur UInt32
tapez et sert de remplacement typé pour stocker des valeurs IPv4. Il fournit un stockage compact avec le format d'entrée-sortie convivial et les informations de type de colonne sur l'inspection.
Utilisation De Base
CREATE TABLE hits (url String, from IPv4) ENGINE = MergeTree() ORDER BY url;
DESCRIBE TABLE hits;
┌─name─┬─type───┬─default_type─┬─default_expression─┬─comment─┬─codec_expression─┐
│ url │ String │ │ │ │ │
│ from │ IPv4 │ │ │ │ │
└──────┴────────┴──────────────┴────────────────────┴─────────┴──────────────────┘
Ou vous pouvez utiliser le domaine IPv4 comme clé:
CREATE TABLE hits (url String, from IPv4) ENGINE = MergeTree() ORDER BY from;
IPv4
le domaine prend en charge le format d'entrée personnalisé en tant que chaînes IPv4:
INSERT INTO hits (url, from) VALUES ('https://wikipedia.org', '116.253.40.133')('https://clickhouse.tech', '183.247.232.58')('https://clickhouse.yandex/docs/en/', '116.106.34.242');
SELECT * FROM hits;
┌─url────────────────────────────────┬───────────from─┐
│ https://clickhouse.tech/docs/en/ │ 116.106.34.242 │
│ https://wikipedia.org │ 116.253.40.133 │
│ https://clickhouse.tech │ 183.247.232.58 │
└────────────────────────────────────┴────────────────┘
Les valeurs sont stockées sous forme binaire compacte:
SELECT toTypeName(from), hex(from) FROM hits LIMIT 1;
┌─toTypeName(from)─┬─hex(from)─┐
│ IPv4 │ B7F7E83A │
└──────────────────┴───────────┘
Les valeurs de domaine ne sont pas implicitement convertibles en types autres que UInt32
.
Si vous voulez convertir IPv4
valeur à une chaîne, vous devez le faire explicitement avec IPv4NumToString()
fonction:
SELECT toTypeName(s), IPv4NumToString(from) as s FROM hits LIMIT 1;
┌─toTypeName(IPv4NumToString(from))─┬─s──────────────┐
│ String │ 183.247.232.58 │
└───────────────────────────────────┴────────────────┘
Ou coulé à un UInt32
valeur:
SELECT toTypeName(i), CAST(from as UInt32) as i FROM hits LIMIT 1;
┌─toTypeName(CAST(from, 'UInt32'))─┬──────────i─┐
│ UInt32 │ 3086477370 │
└──────────────────────────────────┴────────────┘