ClickHouse v21.9 Documentation
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2021-09-30 08:12:03
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Introduction
Performance
History
Distinctive Features
Overview
Adopters
F.A.Q.
General
Integration
Operations
Use Cases
What’s New
What’s New in ClickHouse?
Roadmap
Security Changelog
Changelog
2019
2018
2020
2021
2017
Getting Started
Tutorial
Installation
Playground
Example Datasets
Cell Towers
OnTime
GitHub Events
Introduction
OpenSky
Terabyte Click Logs from Criteo
AMPLab Big Data Benchmark
Yandex.Metrica Data
Brown University Benchmark
UK Property Price Paid
Star Schema Benchmark
Recipes Dataset
WikiStat
New York Taxi Data
Menus
Interfaces
Native Interface (TCP)
Introduction
Command-Line Client
HTTP Interface
JDBC Driver
ODBC Driver
Input and Output Formats
C++ Client Library
MySQL Interface
Third-Party
Visual Interfaces
Integrations
Third-Party Interfaces
Client Libraries
Proxies
Engines
Table Engines
Integrations
Table Engines for Integrations
ExternalDistributed
MySQL
MaterializedPostgreSQL
MongoDB
PostgreSQL
SQLite
Introduction
RabbitMQ
Kafka
EmbeddedRocksDB
S3
ODBC
JDBC
HDFS
MergeTree Family
GraphiteMergeTree
VersionedCollapsingMergeTree
CollapsingMergeTree
Introduction
SummingMergeTree
Custom Partitioning Key
ReplacingMergeTree
AggregatingMergeTree
MergeTree
Data Replication
Log Family
StripeLog
TinyLog
Introduction
Log
Special
GenerateRandom
URL
MaterializedView
File
Merge
Memory
External Data
Distributed
Set
Null
View
Dictionary
Join
Buffer
Special Table Engines
Database Engines
Lazy
PostgreSQL
Replicated
MaterializedPostgreSQL
MaterializedMySQL
Introduction
SQLite
Atomic
MySQL
SQL Reference
Window Functions
Operators
ANSI Compatibility
Operators
IN Operators
Window Functions
Statements
SELECT
WITH
INSERT INTO
OFFSET
PREWHERE
GROUP BY
ORDER BY
ALL
WHERE
LIMIT
FORMAT
HAVING
UNION
FROM
SAMPLE
ARRAY JOIN
JOIN
INTO OUTFILE
DISTINCT
Overview
LIMIT BY
CREATE
SETTINGS PROFILE
VIEW
QUOTA
DATABASE
DICTIONARY
ROW POLICY
Overview
FUNCTION
USER
TABLE
ROLE
ALTER
PARTITION
USER
Distributed DDL
WATCH
SHOW
SET ROLE
COLUMN
SETTING
SAMPLE BY
UPDATE
ATTACH
DETACH
KILL
ALTER
ROLE
ROW POLICY
GRANT
INDEX
Syntax
TTL
ORDER BY
RENAME
USE
EXISTS
OPTIMIZE
REVOKE
CONSTRAINT
EXPLAIN
TRUNCATE
CHECK
SET
DELETE
SYSTEM
VIEW
DROP
DESCRIBE
EXCHANGE
QUOTA
SETTINGS PROFILE
PROJECTION
Functions
Bit
Dates and Times
Rounding
Logical
Pseudo-Random Numbers
Hash
Splitting and Merging Strings and Arrays
IP Addresses
Arithmetic
IN Operator
Working with maps
External Dictionaries
arrayJoin
For Searching in Strings
UUID
For Replacing in Strings
Introduction
Mathematical
Conditional
Encoding
URLs
Arrays
Comparison
Strings
Yandex.Metrica Dictionaries
Files
Type Conversion
JSON
Bitmap
Geo
Encryption
Geohash
H3 Indexes
Other
Nullable
Geographical Coordinates
Tuples
Introspection
Machine Learning
NLP
Aggregate Functions
Introduction
Reference
sumWithOverflow
avg
studentTTest
stddevPop
categoricalInformationValue
anyHeavy
groupBitmapAnd
argMax
varPop(x)
groupBitAnd
uniqExact
any
quantileExact Functions
topK
sumMap
covarPop
groupBitXor
avgWeighted
groupArraySample
uniqTheta
covarSamp
rankCorr
groupBitmap
argMin
groupBitOr
deltaSumTimestamp
quantileTimingWeighted
groupArrayMovingAvg
minMap
deltaSum
max
groupBitmapXor
varSamp
anyLast
min
groupArrayMovingSum
quantile
quantiles Functions
kurtSamp
skewSamp
uniq
groupBitmapOr
groupUniqArray
sumKahan
groupArrayInsertAt
stddevSamp
sum
Parametric
skewPop
sumCount
corr
quantileTiming
kurtPop
uniqHLL12
topKWeighted
quantileTDigestWeighted
welchTTest
median
stochasticLinearRegression
count
stochasticLogisticRegression
uniqCombined64
quantileExactWeighted
quantileTDigest
intervalLengthSum
quantileDeterministic
maxMap
quantileBFloat16
Combinators
simpleLinearRegression
groupArray
uniqCombined
mannWhitneyUTest
Table Functions
mysql
Introduction
cluster
s3
hdfs
generateRandom
null function
remote
input
sqlite
dictionary function
file
view
url
numbers
odbc
merge
postgresql
jdbc
s3Cluster
Dictionaries
Introduction
External Dictionaries
Dictionary Updates
Dictionary Key and Fields
Hierarchical dictionaries
General Description
Polygon Dictionaries With Grids
Sources of External Dictionaries
Storing Dictionaries in Memory
Internal Dictionaries
Configuring an External Dictionary
Data Types
String
LowCardinality
Boolean
Float32, Float64
DateTime
UUID
AggregateFunction
Array(T)
Introduction
Date
Enum
UInt8, UInt16, UInt32, UInt64, UInt256, Int8, Int16, Int32, Int64, Int128, Int256
Date32
Decimal
DateTime64
FixedString(N)
Nested Data Structures
Nested(Name1 Type1, Name2 Type2, …)
Tuple(T1, T2, …)
Nullable
Special Data Types
Interval
Expression
Set
Nothing
Domains
SimpleAggregateFunction
IPv6
Multiword Type Names
Overview
Map(key, value)
Geo
IPv4
Guides
Overview
Applying CatBoost Models
Operations
Monitoring
Access Control and Account Management
Troubleshooting
Introduction
Requirements
ClickHouse Upgrade
Optimizing Performance
Query Profiling
System Tables
system.parts_columns
system.grants
system.users
system.merges
system.current_roles
system.numbers_mt
system.part_log
system.quotas_usage
system.one
system.text_log
system.settings_profiles
system.enabled_roles
system.row_policies
system.merge_tree_settings
system.opentelemetry_span_log
system.settings
system.query_log
system.query_thread_log
system.distribution_queue
system.quotas
system.mutations
system.roles
system.stack_trace
system.settings_profile_elements
system.storage_policies
system.columns
system.disks
system.parts
system.detached_parts
system.licenses
system.metrics
system.metric_log
system.replicated_fetches
system.replicas
system.trace_log
system.asynchronous_metrics
system.role_grants
system.events
system.table_engines
system.quota_limits
system.query_views_log
system.asynchronous_metric_log
system.contributors
system.processes
system.data_type_families
system.data_skipping_indices
system.replication_queue
system.tables
system.crash_log
system.distributed_ddl_queue
System Tables
system.time_zones
system.numbers
system.zookeeper
system.dictionaries
system.functions
system.errors
system.graphite_retentions
system.quota_usage
system.zookeeper_log
system.databases
system.clusters
Server Configuration Parameters
Server Settings
Introduction
Testing Hardware
Settings
User Settings
Permissions for Queries
Settings Profiles
Restrictions on Query Complexity
Settings
Constraints on Settings
MergeTree tables settings
Introduction
Utilities
Usage Recommendations
clickhouse-odbc-bridge
ClickHouse Keeper
ClickHouse obfuscator
clickhouse-format
External Disks for Storing Data
OpenTelemetry Support
clickhouse-local
clickhouse-copier
ClickHouse compressor
clickhouse-benchmark
Caches
Overview
External User Authenticators and Directories
Quotas
Data Backup
Configuration Files
Introduction
Kerberos
LDAP
Development
How to add test queries to ClickHouse CI
CMake in ClickHouse
Testing
Build on Mac OS X
For Beginners
Third-Party Libraries Used
C++ Guide
Build on Linux for AARCH64 (ARM64)
Build on Linux for Mac OS X
Continuous Integration Checks
Source Code Browser
Build on Linux
Architecture Overview
Commercial
Cloud
Support
Introduction
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