mirror of
https://github.com/ClickHouse/ClickHouse.git
synced 2024-10-03 15:10:48 +00:00
16 lines
337 B
Markdown
16 lines
337 B
Markdown
# Dictionaries
|
|
|
|
`A dictionary` is a mapping (key `->` attributes) that can be used in a query as functions.
|
|
You can think of this as a more convenient and efficient type of JOIN with dimension tables.
|
|
|
|
There are built-in (internal) and add-on (external) dictionaries.
|
|
|
|
```eval_rst
|
|
.. toctree::
|
|
|
|
external_dicts
|
|
internal_dicts
|
|
|
|
```
|
|
|