mirror of
https://github.com/ClickHouse/ClickHouse.git
synced 2024-11-16 20:53:27 +00:00
258d2fd499
* normalize
* split & adjust links
* re-normalize
* adjust ru links
* adjust ja/tr links
* partially apply e0d19d2aea
* reset contribs
33 lines
1.8 KiB
Markdown
33 lines
1.8 KiB
Markdown
---
|
|
toc_priority: 4
|
|
toc_title: DICTIONARY
|
|
---
|
|
|
|
# CREATE DICTIONARY {#create-dictionary-query}
|
|
|
|
Creates a new [external dictionary](../../../sql-reference/dictionaries/external-dictionaries/external-dicts.md) with given [structure](../../../sql-reference/dictionaries/external-dictionaries/external-dicts-dict-structure.md), [source](../../../sql-reference/dictionaries/external-dictionaries/external-dicts-dict-sources.md), [layout](../../../sql-reference/dictionaries/external-dictionaries/external-dicts-dict-layout.md) and [lifetime](../../../sql-reference/dictionaries/external-dictionaries/external-dicts-dict-lifetime.md).
|
|
|
|
Syntax:
|
|
|
|
``` sql
|
|
CREATE DICTIONARY [IF NOT EXISTS] [db.]dictionary_name [ON CLUSTER cluster]
|
|
(
|
|
key1 type1 [DEFAULT|EXPRESSION expr1] [HIERARCHICAL|INJECTIVE|IS_OBJECT_ID],
|
|
key2 type2 [DEFAULT|EXPRESSION expr2] [HIERARCHICAL|INJECTIVE|IS_OBJECT_ID],
|
|
attr1 type2 [DEFAULT|EXPRESSION expr3],
|
|
attr2 type2 [DEFAULT|EXPRESSION expr4]
|
|
)
|
|
PRIMARY KEY key1, key2
|
|
SOURCE(SOURCE_NAME([param1 value1 ... paramN valueN]))
|
|
LAYOUT(LAYOUT_NAME([param_name param_value]))
|
|
LIFETIME([MIN val1] MAX val2)
|
|
```
|
|
|
|
External dictionary structure consists of attributes. Dictionary attributes are specified similarly to table columns. The only required attribute property is its type, all other properties may have default values.
|
|
|
|
`ON CLUSTER` clause allows creating dictionary on a cluster, see [Distributed DDL](../../../sql-reference/distributed-ddl.md).
|
|
|
|
Depending on dictionary [layout](../../../sql-reference/dictionaries/external-dictionaries/external-dicts-dict-layout.md) one or more attributes can be specified as dictionary keys.
|
|
|
|
For more information, see [External Dictionaries](../../../sql-reference/dictionaries/external-dictionaries/external-dicts.md) section.
|