Skip to content

Kdb+ and q documentation

or – Reference – kdb+ and q documentation

Initializing search

Home
kdb+ and q
kdb Insights
kdb Insights Enterprise
KDB.AI
PyKX
APIs
Learn
Language
Database
Developing
Architecture
Help

Kdb+ and q documentation

Home
kdb+ and q
kdb+ and q
- About
- Reference card
- Developer tools
- Interfaces
  Interfaces
  - KX libraries
  - Bloomberg
  - C/C++
    C/C++
    
    Quick guide
    
    API reference
    
    C API for kdb+ (WP)
    
    Using C/C++ functions
  - Excel
  - FIX messaging (WP)
  - GPUs
  - Lightning tickerplants (WP)
  - Matlab
  - ODBC
  - ODBC3
  - R
  - Scala
- Open source
- Machine learning
- Using kdb+ in the cloud
  Using kdb+ in the cloud
  - About
  - Amazon Web Services
    Amazon Web Services
    
    Reference architecture
    
    Amazon EC2 & Storage Services
    Amazon EC2 & Storage Services
    
    Migrating a kdb+ HDB to Amazon EC2
    
    Elastic Block Store (EBS)
    
    EFS (NFS)
    
    Amazon Storage Gateway
    
    FSx for Lustre
    
    AWS Lambda
  - Microsoft Azure
    Microsoft Azure
    
    Reference architecture
  - Google Cloud
    Google Cloud
    
    Reference architecture
  - Auto Scaling (WP)
    Auto Scaling (WP)
    
    About
    
    Amazon Web Services
    
    Realtime data cluster
    
    Costs and risks
  - Surveillance in the Cloud (WP)
  - Other file systems
    Other file systems
    
    MapR-FS
    
    Goofys
    
    S3FS
    
    S3QL
    
    ObjectiveFS
    
    WekaIO Matrix
    
    Quobyte
  - DigitalOcean
- Community
- kdb+ and q forum
- White papers
- About this site
kdb Insights
kdb Insights Enterprise
KDB.AI
PyKX
APIs
Learn
Learn
- Get started
- Install
- Licenses
- Mountain tour
  Mountain tour
  - Overview
  - Begin here
  - The q session
  - Tables
  - CSVs
  - Datatypes
  - Scripts
  - IDE
- Q for quants
- Q by Examples
- Q for All
- Examples from Python
  Examples from Python
  - Basic
  - Array
  - List
  - Strings
  - Dictionaries
- Q for Mortals 3
- Q by Puzzles
  Q by Puzzles
- Reading room
  Reading room
  - Information desk
  - Boggle
  - Cats cradle
  - Fizz buzz
  - Klondike
  - Phrasebook
  - Scrabble
- Application examples
  Application examples
- Advanced q
  Advanced q
- Starting kdb+
  Starting kdb+
Language
Language
- Reference card
- By topic
- Iteration
  Iteration
- Keywords
  Keywords
  - abs
  - aj, aj0, ajf, ajf0
  - all, any
  - and
  - asc, iasc, xasc
  - asof
  - attr
  - avg, avgs, mavg, wavg
  - bin, binr
  - ceiling
  - count, mcount
  - cols, xcol, xcols
  - cor
  - cos, acos
  - cov, scov
  - cross
  - csv
  - cut
  - delete
  - deltas
  - desc, idesc, xdesc
  - dev, mdev, sdev
  - differ
  - distinct
  - div
  - dsave
  - each, peach
  - ej
  - ema
  - enlist
  - eval, reval
  - except
  - exec
  - exit
  - exp, xexp
  - fby
  - fills
  - first, last
  - fkeys
  - flip
  - floor
  - get, set
  - getenv, setenv
  - group
  - gtime, ltime
  - hcount
  - hdel
  - hopen, hclose
  - hsym
  - ij, ijf
  - in
  - insert
  - inter
  - inv
  - key
  - keys, xkey
  - like
  - lj, ljf
  - load, rload
  - log, xlog
  - lower
  - lsq
  - max, maxs, mmax
  - md5
  - med
  - meta
  - min, mins, mmin
  - mmu
  - mod
  - neg
  - next, prev, xprev
  - not
  - null
  - or
  - over, scan
  - parse
  - pj
  - prd, prds
  - prior
  - rand
  - rank
  - ratios
  - raze
  - read0
  - read1
  - reciprocal
  - reverse
  - rotate
  - save, rsave
  - select
  - show
  - signum
  - sin, asin
  - sqrt
  - ss, ssr
  - string
  - sublist
  - sum, sums, msum, wsum
  - sv
  - system
  - tables
  - tan, atan
  - til
  - trim, ltrim, rtrim
  - type
  - uj, ujf
  - union
  - ungroup
  - update
  - upsert
  - value
  - var, svar
  - view, views
  - vs
  - where
  - within
  - wj, wj1
  - xbar
  - xgroup
  - xrank
- Overloaded glyphs
- Operators
  Operators
  - Add
  - Amend
  - Apply, Index, Trap
  - Assign
  - Cast
  - Coalesce
  - Compose
  - Cut
  - Deal, Roll, Permute
  - Delete
  - Display
  - Dict
  - Divide
  - Dynamic Load
  - Drop
  - Enkey, Unkey
  - Enumerate
  - Enumeration
  - Enum Extend
  - Equal
  - Exec
  - File Binary
  - File Text
  - Fill
  - Find
  - Flip Splayed
  - Greater
  - Greater Than
  - Identity, Null
  - Join
  - Less Than
  - Lesser
  - Match
  - Matrix Multiply
  - Multiply
  - Not Equal
  - Pad
  - Select
  - Set Attribute
  - Simple Exec
  - Signal
  - Subtract
  - Take
  - Tok
  - Update
  - Vector Conditional
- Control constructs
  Control constructs
  - Cond
  - do
  - if
  - while
- Namespaces
  Namespaces
  - .h
  - .j
  - .m
  - .Q
  - .z
- Application
- Atomic functions
- Comparison
- Conformability
- Connection handles
- Datatypes
- Dictionaries
- Enumerations
- Evaluation control
- Exposed infrastructure
- File system
- Function notation
- Functional qSQL
- Glossary
- Internal functions
- Joins
- Mathematics
- Metadata
- Namespaces
- Parse trees
- Parse trees, functional SQL (WP)
- QSQL queries
- Regular Expressions
- Syntax
- Tables
- Variadic syntax
Database
Database
- Tables in the filesystem
- Populating tables
  Populating tables
- Persisting tables
  Persisting tables
- Maintenance
  Maintenance
Developing
Developing
- IPC
  IPC
- Tools
  Tools
  - Code profiler
  - Debugging
  - Errors
  - man.q
  - System commands
  - Unit tests
  - Using .z
- Coding
  Coding
- DevOps
  DevOps
- Release notes
  Release notes
- FAQ
Architecture
Architecture
- About
- Examples
- Alternative in-memory layouts
- Chained tickerplant
- Client-server
- Corporate actions
- Data recovery for kdb+tick (WP)
- Disaster recovery (WP)
- Gateway design (WP)
- Kdb+tick configuration
- Kdb+tick profiling (WP)
- Kubernetes
- Load balancing
- Memory backed by files
- Optane Memory
  Optane Memory
  - Optane Memory and kdb+
  - Performance tests
- Order Book (WP)
- Publish and subscribe
- Pub/sub with Solace (WP)
- Query Routing (WP)
- Real-time tick subscribers (WP)
- WebSockets (WP)
- Write-only RDB
- Advanced
  Advanced
  - Distributed systems (WP)
  - Intraday writedown (WP)
Help

`or`¶

Greater of two values, logical OR

This work is licensed under a Creative Commons Attribution 4.0 International License.
Kx and kdb+ are registered trademarks of Kx Systems, Inc., a subsidiary of FD Technologies plc.

Made with Material for MkDocs