ClickHouse v20.10 Documentation
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Introduction
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2020-10-28 08:02:54
MergeTree Engine Family
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Introduction
Adopters
Information support
Overview
Distinctive Features
Performance
History
F.A.Q.
General
Integration
Use Cases
Operations
What’s New
What’s New in ClickHouse?
Changelog
Security Changelog
Roadmap
2020
2017
2018
2019
Getting Started
Tutorial
Installation
Example Datasets
Playground
Introduction
Star Schema Benchmark
Yandex.Metrica Data
Terabyte Click Logs from Criteo
New York Taxi Data
OnTime
AMPLab Big Data Benchmark
WikiStat
Interfaces
Introduction
Input and Output Formats
Command-Line Client
HTTP Interface
C++ Client Library
JDBC Driver
ODBC Driver
Native Interface (TCP)
MySQL Interface
Third-Party
Third-Party Interfaces
Client Libraries
Integrations
Visual Interfaces
Proxies
Engines
Table Engines
Introduction
MergeTree Family
Introduction
VersionedCollapsingMergeTree
Custom Partitioning Key
AggregatingMergeTree
Data Replication
SummingMergeTree
MergeTree
CollapsingMergeTree
GraphiteMergeTree
ReplacingMergeTree
Log Family
Introduction
TinyLog
StripeLog
Log
Table Engines for Integrations
Integrations
JDBC
HDFS
MySQL
RabbitMQ
Kafka
ODBC
Special
Special Table Engines
Merge
Dictionary
External Data
Buffer
Memory
MaterializedView
URL
View
Set
Join
File
Distributed
GenerateRandom
Null
Database Engines
Introduction
Lazy
MySQL
SQL Reference
Operators
Operators
IN Operators
ANSI Compatibility
Statements
Syntax
Distributed DDL
SELECT
Overview
WHERE
LIMIT
PREWHERE
GROUP BY
WITH
FROM
UNION ALL
INTO OUTFILE
LIMIT BY
SAMPLE
JOIN
ORDER BY
FORMAT
DISTINCT
HAVING
ARRAY JOIN
INSERT INTO
CREATE
Overview
DATABASE
VIEW
USER
DICTIONARY
ROLE
TABLE
ROW POLICY
SETTINGS PROFILE
QUOTA
ALTER
CHECK
SHOW
USE
OPTIMIZE
REVOKE
TRUNCATE
DETACH
ALTER
INDEX
SETTINGS PROFILE
TTL
COLUMN
SAMPLE BY
QUOTA
ROW POLICY
ROLE
PARTITION
DELETE
UPDATE
USER
CONSTRAINT
ORDER BY
GRANT
SET ROLE
DROP
EXISTS
DESCRIBE
ATTACH
SET
RENAME
KILL
SYSTEM
Functions
Introduction
Splitting and Merging Strings and Arrays
Nullable
Encoding
URLs
Hash
arrayJoin
Other
JSON
Machine Learning
Arrays
Dates and Times
Type Conversion
Pseudo-Random Numbers
Bit
Strings
For Searching in Strings
Comparison
Logical
Introspection
Bitmap
Working with maps
Mathematical
External Dictionaries
Conditional
UUID
Arithmetic
Yandex.Metrica Dictionaries
IP Addresses
For Replacing in Strings
Rounding
IN Operator
Geo
H3 Indexes
Geohash
Geographical Coordinates
Aggregate Functions
Introduction
Parametric
Combinators
Reference
categoricalInformationValue
any
kurtPop
argMax
timeSeriesGroupSum
count
groupArrayInsertAt
sumWithOverflow
uniqCombined64
quantileTDigestWeighted
sum
simpleLinearRegression
avgWeighted
groupArrayMovingAvg
groupBitAnd
argMin
groupArraySample
stochasticLogisticRegression
uniq
corr
stddevSamp
groupBitXor
quantileDeterministic
groupArray
min
quantileExact
uniqHLL12
stochasticLinearRegression
quantileExactWeighted
quantile
quantileTDigest
groupArrayMovingSum
timeSeriesGroupRateSum
kurtSamp
median
minMap
covarSamp
avg
groupBitmapOr
covarPop
uniqCombined
skewPop
groupUniqArray
varPop(x)
varSamp
maxMap
groupBitmap
sumMap
groupBitmapXor
groupBitOr
max
quantileTimingWeighted
stddevPop
quantileTiming
topK
anyHeavy
topKWeighted
skewSamp
quantiles
groupBitmapAnd
anyLast
uniqExact
Table Functions
Introduction
merge
numbers
remote
file
input
url
cluster
odbc
jdbc
mysql
generateRandom
view
hdfs
Dictionaries
Introduction
Internal Dictionaries
External Dictionaries
Sources of External Dictionaries
Configuring an External Dictionary
Hierarchical dictionaries
General Description
Dictionary Key and Fields
Dictionary Updates
Storing Dictionaries in Memory
Data Types
Introduction
Array(T)
Decimal
Tuple(T1, T2, …)
Date
Boolean
AggregateFunction
Enum
Nullable
String
DateTime
UInt8, UInt16, UInt32, UInt64, UInt256, Int8, Int16, Int32, Int64, Int128, Int256
LowCardinality
Float32, Float64
DateTime64
UUID
FixedString(N)
Nested Data Structures
Nested(Name1 Type1, Name2 Type2, …)
Special Data Types
Interval
Expression
Set
Nothing
Domains
Overview
IPv4
IPv6
SimpleAggregateFunction
Guides
Overview
Applying CatBoost Models
Operations
Introduction
ClickHouse Update
Data Backup
Configuration Files
Requirements
Troubleshooting
Monitoring
Access Control and Account Management
Quotas
Optimizing Performance
Query Profiling
System Tables
System Tables
system.licenses
system.current_roles
system.roles
system.detached_parts
system.numbers_mt
system.databases
system.role_grants
system.row_policies
system.enabled_roles
system.settings_profiles
system.replicas
system.quota_usage
system.functions
system.settings_profile_elements
system.grants
system.merge_tree_settings
system.quota_limits
system.trace_log
system.events
system.storage_policies
system.metric_log
system.contributors
system.numbers
system.mutations
system.table_engines
system.one
system.graphite_retentions
system.quotas
system.time_zones
system.processes
system.settings
system.asynchronous_metric_log
system.query_log
system.columns
system.quotas_usage
system.part_log
system.metrics
system.crash_log
system.asynchronous_metrics
system.text_log
system.disks
system.data_type_families
system.users
system.query_thread_log
system.stack_trace
system.tables
system.zookeeper
system.parts
system.merges
system.dictionaries
system.clusters
Server Configuration Parameters
Testing Hardware
Introduction
Server Settings
Settings
Introduction
Constraints on Settings
Settings
Settings Profiles
Restrictions on Query Complexity
User Settings
Permissions for Queries
Utilities
Usage Recommendations
Overview
clickhouse-copier
clickhouse-local
clickhouse-odbc-bridge
clickhouse-benchmark
ClickHouse obfuscator
ClickHouse compressor
OpenTelemetry Support
Development
Third-Party Libraries Used
Continuous Integration Checks
Build on Linux
Source Code Browser
Build on Linux for AARCH64 (ARM64)
Architecture Overview
C++ Guide
Build on Mac OS X
Testing
For Beginners
CMake in ClickHouse
Build on Linux for Mac OS X
Commercial
Introduction
Cloud
Support
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