thevar1able/ClickHouse
1
0
Fork 0
mirror of https://github.com/ClickHouse/ClickHouse.git synced 2024-11-22 15:42:02 +00:00
Code Issues Packages Projects Releases Wiki Activity
2949cd1e6f
ClickHouse/docs/en/sql-reference/dictionaries/index.md
Olga Revyakina adf494ae1f Nullable types
2021-04-04 11:00:48 +03:00

840 B
Raw Blame History

toc_folder_title toc_priority toc_title
Dictionaries 35 Introduction

Dictionaries

A dictionary is a mapping (key -> attributes) that is convenient for various types of reference lists.

ClickHouse supports special functions for working with dictionaries that can be used in queries. It is easier and more efficient to use dictionaries with functions than a JOIN with reference tables.

ClickHouse supports: