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The IFVALID function writes out a specified value if the input expression matches the specified data type. Otherwise, it writes the source value. Input can be a literal, a column reference, or a function. |
The VALID function simply tests if a value is valid. See VALID Function.
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derive type:single value:IFVALID(myZip,'ZipCode', 'ok') as:'myZipCheck' |
Output: Generates a new column called, myZipCheck, which contains the value ok if the value in myZip matches the ZipCode 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:
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set col: validDate value: IFVALID(myDate, ['Datetime','mm-dd-yy','mm*dd*yy'], 'true') |
Output: Sets the values in the validDate column to true, if the corresponding value in the myDate column is a valid Datetime value in yy-mm-dd or yy*mm*dd format.
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derive type:single value:IFVALID(column_string, data_type_literal, computed_value) |
| Argument | Required? | Data Type | Description |
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| source_value | Y | string | Name of column, string literal or function to be tested |
| datatype_literal | Y | string | String literal that identifies the data type against which to validate the source values |
| output_value | y | string | String literal value to write |
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.
| Required? | Data Type | Example Value |
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| Yes | String literal, column reference, or function | myColumn |
datatype_literal
Literal value for data type to which to validate the source column or string.
- Column references are not supported.
| Required? | Data Type | Example Value |
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| Yes | String literal | 'Integer' |
Valid data type strings:
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| Valid Data Type Strings |
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| Valid Data Type Strings |
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output_value
The output value to write if the tested value is valid for the specified data type.
| Required? | Data Type | Example Value |
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| Yes | String or numeric literal | 'Data type mismatch' |
Example - IF* functions for data type validation
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| EXAMPLE - IF Data Type Validation Functions |
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| EXAMPLE - IF Data Type Validation Functions |
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