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ClickHouse v20.10 Documentation
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Functions

 来源:ClickHouse 浏览 266 扫码 分享 2020-10-28 07:59:34
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  • Introduction
    • Overview
    • Distinctive Features
    • Performance
    • History
    • Adopters
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  • Getting Started
    • Installation
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    • Example Datasets
      • Introduction
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        • New York Taxi Data
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      • Playground
  • Interfaces
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  • Engines
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      • Introduction
      • MergeTree Family
        • Introduction
          • MergeTree
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      • Log Family
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    • Database Engines
      • Introduction
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        • Overview
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          • DATABASE
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      • Syntax
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    • Functions
      • Introduction
        • Arithmetic
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        • Comparison
        • Logical
        • Type Conversion
        • Dates and Times
        • Strings
        • For Searching in Strings
        • For Replacing in Strings
        • Conditional
        • Mathematical
        • Rounding
        • Working with maps
        • Splitting and Merging Strings and Arrays
        • Bit
        • Bitmap
        • Hash
        • Pseudo-Random Numbers
        • Encoding
        • UUID
        • URLs
        • IP Addresses
        • JSON
        • External Dictionaries
        • Yandex.Metrica Dictionaries
        • IN Operator
        • arrayJoin
        • Geo
          • Geographical Coordinates
          • Geohash
          • H3 Indexes
        • Nullable
        • Machine Learning
        • Introspection
        • Other
    • Aggregate Functions
      • Introduction
        • Reference
          • count
          • min
          • max
          • sum
          • avg
          • any
          • stddevPop
          • stddevSamp
          • varPop(x)
          • varSamp
          • covarPop
          • covarSamp
          • anyHeavy
          • anyLast
          • argMin
          • argMax
          • avgWeighted
          • corr
          • topK
          • topKWeighted
          • groupArray
          • groupUniqArray
          • groupArrayInsertAt
          • groupArrayMovingSum
          • groupArrayMovingAvg
          • groupArraySample
          • groupBitAnd
          • groupBitOr
          • groupBitXor
          • groupBitmap
          • groupBitmapAnd
          • groupBitmapOr
          • groupBitmapXor
          • sumWithOverflow
          • sumMap
          • minMap
          • maxMap
          • skewPop
          • skewSamp
          • kurtPop
          • kurtSamp
          • timeSeriesGroupSum
          • timeSeriesGroupRateSum
          • uniq
          • uniqExact
          • uniqCombined
          • uniqCombined64
          • uniqHLL12
          • quantile
          • quantiles
          • quantileExact
          • quantileExactWeighted
          • quantileTiming
          • quantileTimingWeighted
          • quantileDeterministic
          • quantileTDigest
          • quantileTDigestWeighted
          • simpleLinearRegression
          • stochasticLinearRegression
          • stochasticLogisticRegression
          • categoricalInformationValue
          • median
        • Combinators
        • Parametric
    • Table Functions
      • Introduction
        • file
        • merge
        • numbers
        • remote
        • url
        • mysql
        • jdbc
        • odbc
        • hdfs
        • input
        • generateRandom
        • cluster
        • view
    • Dictionaries
      • Introduction
        • External Dictionaries
          • General Description
          • Configuring an External Dictionary
          • Storing Dictionaries in Memory
          • Dictionary Updates
          • Sources of External Dictionaries
          • Dictionary Key and Fields
          • Hierarchical dictionaries
        • Internal Dictionaries
    • Data Types
      • Introduction
        • UInt8, UInt16, UInt32, UInt64, UInt256, Int8, Int16, Int32, Int64, Int128, Int256
        • Float32, Float64
        • Decimal
        • Boolean
        • String
        • FixedString(N)
        • UUID
        • Date
        • DateTime
        • DateTime64
        • Enum
        • LowCardinality
        • Array(T)
        • AggregateFunction
        • Nested Data Structures
          • Nested(Name1 Type1, Name2 Type2, …)
        • Tuple(T1, T2, …)
        • Nullable
        • Special Data Types
          • Expression
          • Set
          • Nothing
          • Interval
      • Domains
        • Overview
          • IPv4
          • IPv6
        • SimpleAggregateFunction
    • Operators
      • Operators
        • IN Operators
      • ANSI Compatibility
  • Guides
    • Overview
      • Applying CatBoost Models
  • Operations
    • Introduction
      • Requirements
      • Monitoring
      • Troubleshooting
      • ClickHouse Update
      • Access Control and Account Management
      • Data Backup
      • Configuration Files
      • Quotas
      • Optimizing Performance
        • Query Profiling
    • System Tables
      • System Tables
        • system.asynchronous_metric_log
        • system.asynchronous_metrics
        • system.clusters
        • system.columns
        • system.contributors
        • system.crash_log
        • system.current_roles
        • system.data_type_families
        • system.databases
        • system.detached_parts
        • system.dictionaries
        • system.disks
        • system.enabled_roles
        • system.events
        • system.functions
        • system.grants
        • system.graphite_retentions
        • system.licenses
        • system.merge_tree_settings
        • system.merges
        • system.metric_log
        • system.metrics
        • system.mutations
        • system.numbers
        • system.numbers_mt
        • system.one
        • system.part_log
        • system.parts
        • system.processes
        • system.query_log
        • system.query_thread_log
        • system.quota_limits
        • system.quota_usage
        • system.quotas
        • system.quotas_usage
        • system.replicas
        • system.role_grants
        • system.roles
        • system.row_policies
        • system.settings
        • system.settings_profile_elements
        • system.settings_profiles
        • system.stack_trace
        • system.storage_policies
        • system.table_engines
        • system.tables
        • system.text_log
        • system.time_zones
        • system.trace_log
        • system.users
        • system.zookeeper
    • Server Configuration Parameters
      • Introduction
        • Server Settings
      • Testing Hardware
    • Settings
      • Introduction
        • Permissions for Queries
        • Restrictions on Query Complexity
        • Settings Profiles
        • Constraints on Settings
        • User Settings
        • Settings
    • Utilities
      • Overview
        • clickhouse-copier
        • clickhouse-local
        • clickhouse-benchmark
        • ClickHouse compressor
        • ClickHouse obfuscator
        • clickhouse-odbc-bridge
      • Usage Recommendations
      • OpenTelemetry Support
  • Development
    • For Beginners
    • Architecture Overview
    • Continuous Integration Checks
    • Build on Linux
    • Build on Mac OS X
    • Build on Linux for Mac OS X
    • Build on Linux for AARCH64 (ARM64)
    • C++ Guide
    • Testing
    • Third-Party Libraries Used
    • Source Code Browser
    • CMake in ClickHouse
  • Commercial
    • Introduction
      • Cloud
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  • F.A.Q.
    • General
    • Use Cases
    • Operations
    • Integration
  • What’s New
    • Changelog
      • 2020
        • 2019
        • 2018
        • 2017
      • Roadmap
      • Security Changelog
    • What’s New in ClickHouse?
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