constraints.checkUnique

If <code>TRUE</code>, then all values for that field <code>MUST</code> be unique within the data file in which it is found.

Allows to work with 'Table Schema' (<https://specs.frictionlessdata.io/table-schema/>). 'Table Schema' is well suited for use cases around handling and validating tabular data in text formats such as 'csv', but its utility extends well beyond this core usage, towards a range of applications where data benefits from a portable schema format. The 'tableschema.r' package can load and validate any table schema descriptor, allow the creation and modification of descriptors, expose methods for reading and streaming data that conforms to a 'Table Schema' via the 'Tabular Data Resource' abstraction.

Kleanthis Koupidis

tableschema.r

Table Schema 'Frictionless Data'

Lazaros Ioannidis

Charalampos Bratsas

Open Knowledge International 

constraints.checkUnique function

<dl><dt>constraint</dt>
<dd>set TRUE to check unique values</dd>
<dt>value</dt>
<dd>value to check</dd></dl>

Arguments

Check if a field is unique — constraints.checkUnique

<dl>

<dt>constraint</dt>
<dd>set TRUE to check unique values</dd>


<dt>value</dt>
<dd>value to check</dd>

</dl>

constraints.checkUnique: Check if a field is unique

Description

Usage

Value

Arguments

See Also

Examples