ClickHouse v21.2 Documentation
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来源 1 浏览 341 扫码 打印 2021-03-09 00:08:08
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    • Introduction
      • Adopters
      • Information support
      • Overview
      • Distinctive Features
      • Performance
      • History
    • F.A.Q.
      • General
        • Why ClickHouse is so fast?
        • What does “Не тормозит” mean?
        • What is OLAP?
        • Why not use something like MapReduce?
        • What does “ClickHouse” mean?
        • Who is using ClickHouse?
        • What is a columnar database?
      • Integration
        • How do I export data from ClickHouse to a file?
        • What if I have a problem with encodings when connecting to Oracle via ODBC?
        • How to import JSON into ClickHouse?
      • Use Cases
        • Can I use ClickHouse as a key-value storage?
        • Can I use ClickHouse as a time-series database?
      • Operations
        • Which ClickHouse version to use in production?
        • Is it possible to delete old records from a ClickHouse table?
    • What’s New
      • Security Changelog
        • What’s New in ClickHouse?
      • Roadmap
      • Changelog
        • 2017
        • 2018
        • 2019
        • 2020
        • 2021
    • Getting Started
      • Playground
      • Tutorial
      • Installation
      • Example Datasets
        • Star Schema Benchmark
        • Yandex.Metrica Data
        • Terabyte Click Logs from Criteo
        • New York Taxi Data
        • Introduction
        • OnTime
        • Brown University Benchmark
        • AMPLab Big Data Benchmark
        • GitHub Events
        • WikiStat
        • Cell Towers
        • Recipes Dataset
    • Interfaces
      • Input and Output Formats
      • Command-Line Client
      • HTTP Interface
      • Introduction
      • C++ Client Library
      • Native Interface (TCP)
      • JDBC Driver
      • ODBC Driver
      • MySQL Interface
      • Third-Party
        • Client Libraries
        • Integrations
        • Visual Interfaces
        • Proxies
        • Third-Party Interfaces
    • Engines
      • Table Engines
        • Introduction
        • MergeTree Family
          • VersionedCollapsingMergeTree
          • Custom Partitioning Key
          • AggregatingMergeTree
          • Data Replication
          • SummingMergeTree
          • MergeTree
          • CollapsingMergeTree
          • GraphiteMergeTree
          • ReplacingMergeTree
          • Introduction
        • Log Family
          • TinyLog
          • StripeLog
          • Introduction
          • Log
        • Integrations
          • JDBC
          • MongoDB
          • HDFS
          • MySQL
          • RabbitMQ
          • S3
          • Kafka
          • EmbeddedRocksDB
          • ODBC
          • Table Engines for Integrations
        • Special
          • Merge
          • Dictionary
          • External Data
          • Special Table Engines
          • Buffer
          • Memory
          • MaterializedView
          • URL
          • View
          • Set
          • Join
          • File
          • Distributed
          • GenerateRandom
          • Null
      • Database Engines
        • Lazy
        • MySQL
        • Atomic
        • Introduction
        • MaterializeMySQL
    • SQL Reference
      • Operators
        • IN Operators
        • Operators
        • ANSI Compatibility
      • Window Functions
        • Window Functions
      • Statements
        • SELECT
          • WHERE
          • LIMIT
          • PREWHERE
          • GROUP BY
          • UNION
          • WITH
          • Overview
          • FROM
          • ALL
          • INTO OUTFILE
          • LIMIT BY
          • SAMPLE
          • JOIN
          • ORDER BY
          • INSERT INTO
          • FORMAT
          • DISTINCT
          • HAVING
          • ARRAY JOIN
        • CREATE
          • DATABASE
          • Overview
          • VIEW
          • USER
          • DICTIONARY
          • ROLE
          • TABLE
          • ROW POLICY
          • SETTINGS PROFILE
          • QUOTA
        • ALTER
          • INDEX
          • Syntax
          • SETTINGS PROFILE
          • TTL
          • Distributed DDL
          • CHECK
          • COLUMN
          • SHOW
          • USE
          • OPTIMIZE
          • WATCH
          • REVOKE
          • TRUNCATE
          • DETACH
          • ALTER
          • SAMPLE BY
          • QUOTA
          • ROW POLICY
          • ROLE
          • GRANT
          • SET ROLE
          • PARTITION
          • DELETE
          • UPDATE
          • EXPLAIN
          • DROP
          • USER
          • EXISTS
          • DESCRIBE
          • ATTACH
          • CONSTRAINT
          • SET
          • ORDER BY
          • RENAME
          • KILL
          • SYSTEM
      • Functions
        • Splitting and Merging Strings and Arrays
        • Encoding
        • URLs
        • Hash
        • arrayJoin
        • JSON
        • Arrays
        • Dates and Times
        • Type Conversion
        • Pseudo-Random Numbers
        • Bit
        • Array
        • Strings
        • For Searching in Strings
        • Comparison
        • Introduction
        • Logical
        • Bitmap
        • Working with maps
        • Mathematical
        • External Dictionaries
        • Conditional
        • UUID
        • Arithmetic
        • Yandex.Metrica Dictionaries
        • IP Addresses
        • For Replacing in Strings
        • Rounding
        • IN Operator
        • Geo
          • Nullable
          • Tuples
          • Encryption
          • Other
          • Machine Learning
          • H3 Indexes
          • Geohash
          • Introspection
          • Geographical Coordinates
      • Aggregate Functions
        • Introduction
        • Reference
          • categoricalInformationValue
          • any
          • kurtPop
          • argMax
          • count
          • groupArrayInsertAt
          • sumWithOverflow
          • uniqCombined64
          • quantileTDigestWeighted
          • sum
          • simpleLinearRegression
          • avgWeighted
          • groupArrayMovingAvg
          • groupBitAnd
          • argMin
          • groupArraySample
          • stochasticLogisticRegression
          • varPop(x)
          • uniq
          • corr
          • stddevSamp
          • groupBitXor
          • quantileDeterministic
          • studentTTest
          • groupArray
          • min
          • quantileExact
          • uniqHLL12
          • stochasticLinearRegression
          • Parametric
          • quantileExactWeighted
          • quantile
          • quantileTDigest
          • groupArrayMovingSum
          • kurtSamp
          • median
          • initializeAggregation
          • minMap
          • covarSamp
          • rankCorr
          • avg
          • groupBitmapOr
          • covarPop
          • uniqCombined
          • skewPop
          • groupUniqArray
          • Combinators
          • varSamp
          • maxMap
          • groupBitmap
          • sumMap
          • groupBitmapXor
          • groupBitOr
          • max
          • quantileTimingWeighted
          • stddevPop
          • quantileTiming
          • deltaSum
          • topK
          • anyHeavy
          • mannWhitneyUTest
          • topKWeighted
          • skewSamp
          • quantiles
          • groupBitmapAnd
          • anyLast
          • welchTTest
          • uniqExact
      • Table Functions
        • merge
        • Introduction
        • null function
        • numbers
        • remote
        • file
        • input
        • url
        • cluster
        • odbc
        • jdbc
        • mysql
        • generateRandom
        • s3
        • view
        • hdfs
      • Dictionaries
        • Introduction
        • External Dictionaries
          • Sources of External Dictionaries
          • Polygon Dictionaries With Grids
          • Internal Dictionaries
          • Configuring an External Dictionary
          • Hierarchical dictionaries
          • General Description
          • Dictionary Key and Fields
          • Dictionary Updates
          • Storing Dictionaries in Memory
      • Data Types
        • Decimal
        • Date
        • Boolean
        • Array(T)
        • FixedString(N)
        • AggregateFunction
        • Introduction
        • Enum
        • String
        • DateTime
        • UInt8, UInt16, UInt32, UInt64, UInt256, Int8, Int16, Int32, Int64, Int128, Int256
        • LowCardinality
        • Float32, Float64
        • DateTime64
        • UUID
        • Nested Data Structures
          • Tuple(T1, T2, …)
          • Nullable
          • Nested(Name1 Type1, Name2 Type2, …)
        • Special Data Types
          • Interval
          • Expression
          • Set
          • Nothing
        • Domains
          • Multiword Type Names
          • IPv4
          • Geo
          • Overview
          • SimpleAggregateFunction
          • IPv6
          • Map(key, value)
    • Guides
      • Overview
        • Applying CatBoost Models
    • Operations
      • Introduction
        • ClickHouse Upgrade
        • Requirements
        • Troubleshooting
        • Monitoring
        • Access Control and Account Management
      • Testing Hardware
      • Optimizing Performance
        • Query Profiling
      • System Tables
        • system.licenses
        • system.current_roles
        • system.roles
        • System Tables
        • system.detached_parts
        • system.numbers_mt
        • system.databases
        • system.role_grants
        • system.row_policies
        • system.enabled_roles
        • system.opentelemetry_span_log
        • system.settings_profiles
        • system.replicas
        • system.quota_usage
        • system.functions
        • system.settings_profile_elements
        • system.errors
        • system.grants
        • system.merge_tree_settings
        • system.quota_limits
        • system.trace_log
        • system.events
        • system.distributed_ddl_queue
        • 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.replication_queue
        • system.asynchronous_metric_log
        • system.distribution_queue
        • system.query_log
        • system.columns
        • system.quotas_usage
        • system.replicated_fetches
        • system.part_log
        • system.parts_columns
        • 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
        • Server Settings
        • Introduction
      • Settings
        • Constraints on Settings
        • Settings
        • Settings Profiles
        • Introduction
        • Restrictions on Query Complexity
        • MergeTree tables settings
        • User Settings
        • Permissions for Queries
      • Utilities
        • clickhouse-copier
        • Usage Recommendations
        • Caches
        • Overview
        • OpenTelemetry Support
        • clickhouse-local
        • clickhouse-odbc-bridge
        • clickhouse-benchmark
        • ClickHouse obfuscator
        • ClickHouse compressor
      • External User Authenticators and Directories
        • LDAP
        • Data Backup
        • Configuration Files
        • Introduction
        • Quotas
    • Development
      • Build on Linux for AARCH64 (ARM64)
      • Third-Party Libraries Used
      • Continuous Integration Checks
      • Build on Linux
      • Source Code Browser
      • Architecture Overview
      • C++ Guide
      • Build on Mac OS X
      • Testing
      • How to add test queries to ClickHouse CI
      • For Beginners
      • CMake in ClickHouse
      • Build on Linux for Mac OS X
    • Commercial
      • Cloud
      • Support
      • Introduction
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