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Comment: Published by Scroll Versions from space DEV and version r0712

D toc

Excerpt

The IFMISMATCHED function writes out a specified value if the input expression does not match the specified data type or typing array. Otherwise, it writes the source value. Input can be a literal, a column reference, or a function.

The ISMISMATCHED function simply tests if a value is mismatched. See ISMISMATCHED Function.

D s lang vs sql

D s
snippetBasic

Basic data type:

D lang syntax
RawWrangletrue
Typeref
showNotetrue
WrangleTextderive type:single value:ifmismatched(my_ssn,'SSN', 'XXX-XX-XXXX') as:'final_SSN'

ifmismatched(my_ssn,'SSN', 'XXX-XX-XXXX')

Output: Returns the value XXX-XX-XXXX if the value in my_ssn does not match the SSN data type. 

Data type with formatting options:

For data types with formatting options, such as Datetime, you can specify the format using an array, as in the following:

D lang syntax
RawWrangletrue
Typeref
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WrangleTextset col: month_Date value: ifmismatched(month_Date, ['Datetime','mm-dd-yy','mm*dd*yy'], null())

ifmismatched(month_Date, ['Datetime','mm-dd-yy','mm*dd*yy'], null())

Output: Returns null if values in month_Date are mismatched against Datetime values in the mm-dd-yy or mm*dd*yy formats.

D s
snippetSyntax

D lang syntax
RawWrangletrue
Typesyntax
showNotetrue
WrangleTextderive type:single value:ifmismatched(column_string, data_type_literal, computed_value)

ifmismatched(column_string, data_type_literal, computed_value)


ArgumentRequired?Data TypeDescription
source_valueYstringName of column, string literal or function to be tested
datatype_literalYstringString literal or array that identifies the data type against which to validate the source values
output_valueystringString literal value to write

D s lang notes

source_value

Name of the column, string literal, or function to be tested for data type matches.

  • Missing literals or column values generate missing string results.
  • Multiple columns and wildcards are not supported.

D s
snippetusage

Required?Data TypeExample Value
YesString literal, column reference, or functionmyColumn

datatype_literal

Literal value or string array that identifies data type to which to validate the source column or string.

  • Column references are not supported.

D s
snippetusage

Required?Data TypeExample Value
YesString literal'Integer'

Valid data type strings:

Include Page
Valid Data Type Strings
Valid Data Type Strings

output_value

The output value to write if the tested value is mismatched for the specified data type.

D s
snippetusage

Required?Data TypeExample Value
YesString or numeric literal'Data type mismatch'

D s
snippetExamples

Example - IF* functions for data type validation

Include Page
EXAMPLE - IF Data Type Validation Functions
EXAMPLE - IF Data Type Validation Functions

D s also
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