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buted integer, for ` _ N  _ ` elements and characteristic
exponent ` _ s  _ ` .

##  Syntax  ¶

    
    
    ZIPF( 
 , <N> , <gen> )
    

Copy

##  Usage Notes  ¶

  * The computational cost of choosing a single random number is logarithmic in the argument ` _ N  _ ` . More importantly, the memory cost is linear for ` _ N  _ ` . Because of this, the argument ` _ N  _ ` is limited to the inclusive range ` [1,  16777215]  ` . 

  * ` _ gen  _ ` specifies the generator expression for the function. For more information, see [ Usage Notes  ](../functions-data-generation.html#label-rand-dist-functions) . 

  * The first two arguments ( ` _ s  _ ` and ` _ N  _ ` ) must be constants. 

##  Examples  ¶

    
    
    SELECT zipf(1, 10, random()) FROM table(generator(rowCount => 10));
    
    +-----------------------+
    | ZIPF(1, 10, RANDOM()) |
    |-----------------------|
    |                     9 |
    |                     7 |
    |                     1 |
    |                     8 |
    |                     8 |
    |                     2 |
    |                     3 |
    |                     8 |
    |                     2 |
    |                     5 |
    +-----------------------+
    

Copy

    
    
    SELECT zipf(1, 10, 1234) FROM table(generator(rowCount => 10));
    
    +-------------------+
    | ZIPF(1, 10, 1234) |
    |-------------------|
    |                 4 |
    |                 4 |
    |                 4 |
    |                 4 |
    |                 4 |
    |                 4 |
    |                 4 |
    |                 4 |
    |                 4 |
    |                 4 |
    +-------------------+
    

Copy

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[ Reference ](/en/reference) [ Function and Stored Procedure Reference
](/en/sql-reference-functions) [ Data Generation ](/en/sql-
reference/functions-data-generation) UUID_STRING

Categories:

    

[ String & Binary Functions  ](../functions-string) (General) , [ Data
Generation Functions  ](../functions-data-generation)

#  UUID_STRING  ¶

Generates either a version 4 (random) or version 5 (named) RFC 4122-compliant
UUID as a formatted string.

##  Syntax  ¶

    
    
    UUID_STRING()
    
    UUID_STRING( <uuid> , <name> )
    

Copy

##  Usage Notes  ¶

  * UUID_STRING returns a 128-bit value, formatted as a string. For random-number generation, the 64-bit [ Mersenne twister ](http://en.wikipedia.org/wiki/Mersenne_twister) known as MT19937-64 is used. 

  * UUID_STRING supports generating two versions of UUIDs, both compliant with RFC 4122: 

    * A version 4 (random) UUID is returned when no arguments are provided to the function. 

    * A version 5 (named) UUID can be produced by providing a ` _ uuid  _ ` string (known as the namespace) as the first argument and a ` _ name  _ ` string as the second argument. 

##  Examples  ¶

    
    
    SELECT UUID_STRING();
    
    +--------------------------------------+
    | UUID_STRING()                        |
    |--------------------------------------|
    | 3afd051d-4bd0-4b30-8376-cf062719f090 |
    +--------------------------------------+
    

Copy

    
    
    SELECT UUID_STRING('fe971b24-9572-4005-b22f-351e9c09274d','foo');
    
    +-----------------------------------------------------------+
    | UUID_STRING('FE971B24-9572-4005-B22F-351E9C09274D','FOO') |
    |-----------------------------------------------------------|
    | dc0b6f65-fca6-5b4b-9d37-ccc3fde1f3e2                      |
    +-----------------------------------------------------------+
    

Copy

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m string of specified ` _ length  _ ` .

##  Syntax  ¶

    
    
    RANDSTR( <length> , <gen> )
    

Copy

##  Usage Notes  ¶

  * Individual characters are chosen uniformly at random from the following pool of characters: 0-9, a-z, A-Z. 

  * The value for the generator expression, ` _ gen  _ ` , is used as the seed for this uniform random distribution. For more information about generator expressions, see [ Usage Notes  ](../functions-data-generation.html#label-rand-dist-functions) . 

##  Examples  ¶

    
    
    SELECT randstr(5, random()) FROM table(generator(rowCount => 5));
    
    +----------------------+
    | RANDSTR(5, RANDOM()) |
    |----------------------|
    | rM6ep                |
    | nsWJ0                |
    | IQi5H                |
    | VBNvY                |
    | wjk6y                |
    +----------------------+
    

Copy

    
    
    SELECT randstr(5, 1234) FROM table(generator(rowCount => 5));
    
    +------------------+
    | RANDSTR(5, 1234) |
    |------------------|
    | E5tav            |
    | E5tav            |
    | E5tav            |
    | E5tav            |
    | E5tav            |
    +------------------+
    

Copy

    
    
    SELECT randstr(abs(random()) % 10, random()) FROM table(generator(rowCount => 5));
    
    +---------------------------------------+
    | RANDSTR(ABS(RANDOM()) % 10, RANDOM()) |
    |---------------------------------------|
    | e                                     |
    | iR                                    |
    | qRwWl7W6                              |
    |                                       |
    | Yg                                    |
    +---------------------------------------+
    

Copy

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uffer
    Implements IDisposable

Inheritance

    

[ Object ](/en-us/dotnet/api/system.object)

CoreWebView2SharedBuffer

Implements

    

[ IDisposable ](/en-us/dotnet/api/system.idisposable)

##  Properties

[ Buffer ](microsoft.web.webview2.core.corewebview2sharedbuffer.buffer?view=webview2-dotnet-1.0.2365.46#microsoft-web-webview2-core-corewebview2sharedbuffer-buffer) |  The raw memory address of the buffer.   
---|---  
[ FileMappingHandle ](microsoft.web.webview2.core.corewebview2sharedbuffer.filemappinghandle?view=webview2-dotnet-1.0.2365.46#microsoft-web-webview2-core-corewebview2sharedbuffer-filemappinghandle) |  The file mapping handle of the shared memory of the buffer.   
[ Size ](microsoft.web.webview2.core.corewebview2sharedbuffer.size?view=webview2-dotnet-1.0.2365.46#microsoft-web-webview2-core-corewebview2sharedbuffer-size) |  The size of the shared buffer in bytes.   
  
##  Methods

[ Close() ](microsoft.web.webview2.core.corewebview2sharedbuffer.close?view=webview2-dotnet-1.0.2365.46#microsoft-web-webview2-core-corewebview2sharedbuffer-close) |  Release the backing shared memory.   
---|---  
[ Dispose() ](microsoft.web.webview2.core.corewebview2sharedbuffer.dispose?view=webview2-dotnet-1.0.2365.46#microsoft-web-webview2-core-corewebview2sharedbuffer-dispose) |  Performs application-defined tasks associated with freeing, releasing, or resetting unmanaged resources.   
[ Dispose(Boolean) ](microsoft.web.webview2.core.corewebview2sharedbuffer.dispose?view=webview2-dotnet-1.0.2365.46#microsoft-web-webview2-core-corewebview2sharedbuffer-dispose\(system-boolean\)) |  Protected implementation of Dispose pattern.   
[ OpenStream() ](microsoft.web.webview2.core.corewebview2sharedbuffer.openstream?view=webview2-dotnet-1.0.2365.46#microsoft-web-webview2-core-corewebview2sharedbuffer-openstream) |  Get an stream object that can be used to access the shared buffer.   
  
##  Applies to

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Search all packages and functions

#  CheckLuhn

[ ](https://travis-ci.org/adamjdeacon/checkLuhn) [
](https://ci.appveyor.com/project/adamjdeacon/checkLuhn) [
](https://codecov.io/gh/adamjdeacon/checkLuhn?branch=master) [
](http://www.rdocumentation.org/packages/checkLuhn)

##  Overview

checkLuhn is package to assist checking PANs (credit/debit card number) or any
other number that uses the Luhn algorithum to validte.

The algorithm is in the public domain and is in wide use today. It is
specified in ISO/IEC 7812-1. It is not intended to be a cryptographically
secure hash function; it was designed to protect against accidental errors,
not malicious attacks. Most credit cards and many government identification
numbers use the algorithm as a simple method of distinguishing valid numbers
from mistyped or otherwise incorrect numbers.

The ` issuer ` function will can return the Card Issuer/Scheme and if that
scheme is active or not

##  Installation

    
    
    # The easiest way to get checkLuhn:
    install.packages("checkLuhn")

###  Development version

To get a bug fix, or use a feature from the development version, you can
install dplyr from GitHub.

    
    
    # install.packages("devtools")
    devtools::install_github("adamjdeacon/checkLuhn")

##  Usage

    
    
    library(checkLuhn)
    
    # Invalid number
    input <- "4111 2234 2242 1234"
    checkLuhn(input)
    [1] FALSE
    
    # Valid number
    input <- "34000000 0000 009"
    checkLuhn(input)
    [1] TRUE
    
    # Check for card type
    input <- '378282246310005'
    > issuer(input)
    # A tibble: 1 x 2
      issuer           active
      <chr>            <chr> 
    1 American Express Yes  

##  Getting help

If you encounter a clear bug, please file a minimal reproducible example on [
github ](https://github.com/adamjdeacon/checkLuhn/issues) .

####  Copy Link

Copy  Link to current version

####  Version

Version

1.1.0  1.0.2  Down Chevron

####  Install

    
    
    install.packages('checkLuhn')

####  Monthly Downloads

227

####  Version

1.1.0

####  License

GPL-2

####  Issues

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####  Stars

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####  Forks

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####  Repository

[ https://github.com/adamjdeacon/checkLuhn
](https://github.com/adamjdeacon/checkLuhn)

####  Maintainer

[ Adam Deacon ](/collaborators/name/Adam%20Deacon)

####  Last Published

September 24th, 2018

##  Functions in checkLuhn (1.1.0)

Search functions

checkLuhn

Checks number is Luhn compliant

issuer

issuer

checkLuhn-package

Functions and data for working with credit and debit cards

bin_ranges

BIN ranges

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