# IFieldInTableData Interface
Namespace: [Qlik.Engine](https://help.qlik.com/en-US/sense-developer/November2025/Subsystems/NetSDKAPIref/Content/Qlik.Engine.htm)
Assembly: Qlik.Engine.dll
## Syntax
```
[ValueClass]
public interface IFieldInTableData
```
## Properties
| Name | Description |
| --- | --- |
| [Comment](https://help.qlik.com/en-US/sense-developer/November2025/Subsystems/NetSDKAPIref/Content/Qlik.Engine.IFieldInTableData.Comment.htm#Qlik_Engine_IFieldInTableData_Comment) | Comment related to the field.
JSON property name: qComment |
| [DerivedFields](https://help.qlik.com/en-US/sense-developer/November2025/Subsystems/NetSDKAPIref/Content/Qlik.Engine.IFieldInTableData.DerivedFields.htm#Qlik_Engine_IFieldInTableData_DerivedFields) | List of the derived fields.
JSON property name: qDerivedFields |
| [HasDuplicates](https://help.qlik.com/en-US/sense-developer/November2025/Subsystems/NetSDKAPIref/Content/Qlik.Engine.IFieldInTableData.HasDuplicates.htm#Qlik_Engine_IFieldInTableData_HasDuplicates) | This property is set to true if the field contains some duplicate values.
JSON property name: qHasDuplicates |
| [HasNull](https://help.qlik.com/en-US/sense-developer/November2025/Subsystems/NetSDKAPIref/Content/Qlik.Engine.IFieldInTableData.HasNull.htm#Qlik_Engine_IFieldInTableData_HasNull) | This property is set to true if the field contains some Null values.
JSON property name: qHasNull |
| [HasWild](https://help.qlik.com/en-US/sense-developer/November2025/Subsystems/NetSDKAPIref/Content/Qlik.Engine.IFieldInTableData.HasWild.htm#Qlik_Engine_IFieldInTableData_HasWild) | JSON property name: qHasWild |
| [InformationDensity](https://help.qlik.com/en-US/sense-developer/November2025/Subsystems/NetSDKAPIref/Content/Qlik.Engine.IFieldInTableData.InformationDensity.htm#Qlik_Engine_IFieldInTableData_InformationDensity) | Number of records that have values (for example, not NULL) in the field as compared to the total number of records in the table.
JSON property name: qInformationDensity |
| [IsFieldOnTheFly](https://help.qlik.com/en-US/sense-developer/November2025/Subsystems/NetSDKAPIref/Content/Qlik.Engine.IFieldInTableData.IsFieldOnTheFly.htm#Qlik_Engine_IFieldInTableData_IsFieldOnTheFly) | JSON property name: qIsFieldOnTheFly |
| [IsSynthetic](https://help.qlik.com/en-US/sense-developer/November2025/Subsystems/NetSDKAPIref/Content/Qlik.Engine.IFieldInTableData.IsSynthetic.htm#Qlik_Engine_IFieldInTableData_IsSynthetic) | This property is set to true if the field contains a synthetic key.
JSON property name: qIsSynthetic |
| [KeyType](https://help.qlik.com/en-US/sense-developer/November2025/Subsystems/NetSDKAPIref/Content/Qlik.Engine.IFieldInTableData.KeyType.htm#Qlik_Engine_IFieldInTableData_KeyType) | Tells if the field is a key field.
JSON property name: qKeyType |
| [Name](https://help.qlik.com/en-US/sense-developer/November2025/Subsystems/NetSDKAPIref/Content/Qlik.Engine.IFieldInTableData.Name.htm#Qlik_Engine_IFieldInTableData_Name) | Name of the field.
JSON property name: qName |
| [nNonNulls](https://help.qlik.com/en-US/sense-developer/November2025/Subsystems/NetSDKAPIref/Content/Qlik.Engine.IFieldInTableData.nNonNulls.htm#Qlik_Engine_IFieldInTableData_nNonNulls) | Number of values that are non Null.
JSON property name: qnNonNulls |
| [nPresentDistinctValues](https://help.qlik.com/en-US/sense-developer/November2025/Subsystems/NetSDKAPIref/Content/Qlik.Engine.IFieldInTableData.nPresentDistinctValues.htm#Qlik_Engine_IFieldInTableData_nPresentDistinctValues) | JSON property name: qnPresentDistinctValues |
| [nRows](https://help.qlik.com/en-US/sense-developer/November2025/Subsystems/NetSDKAPIref/Content/Qlik.Engine.IFieldInTableData.nRows.htm#Qlik_Engine_IFieldInTableData_nRows) | Number of rows in the field.
JSON property name: qnRows |
| [nTotalDistinctValues](https://help.qlik.com/en-US/sense-developer/November2025/Subsystems/NetSDKAPIref/Content/Qlik.Engine.IFieldInTableData.nTotalDistinctValues.htm#Qlik_Engine_IFieldInTableData_nTotalDistinctValues) | Number of distinct values in the field.
JSON property name: qnTotalDistinctValues |
| [OriginalFields](https://help.qlik.com/en-US/sense-developer/November2025/Subsystems/NetSDKAPIref/Content/Qlik.Engine.IFieldInTableData.OriginalFields.htm#Qlik_Engine_IFieldInTableData_OriginalFields) | Is shown for fixed records.
`qOriginalFieldName` and `qName` are identical if no field names are used in the file.
`qOriginalFieldName` differs from `qName` if embedded file names are used in the file.
JSON property name: qOriginalFields |
| [Present](https://help.qlik.com/en-US/sense-developer/November2025/Subsystems/NetSDKAPIref/Content/Qlik.Engine.IFieldInTableData.Present.htm#Qlik_Engine_IFieldInTableData_Present) | JSON property name: qPresent |
| [ReadableName](https://help.qlik.com/en-US/sense-developer/November2025/Subsystems/NetSDKAPIref/Content/Qlik.Engine.IFieldInTableData.ReadableName.htm#Qlik_Engine_IFieldInTableData_ReadableName) | JSON property name: qReadableName |
| [SubsetRatio](https://help.qlik.com/en-US/sense-developer/November2025/Subsystems/NetSDKAPIref/Content/Qlik.Engine.IFieldInTableData.SubsetRatio.htm#Qlik_Engine_IFieldInTableData_SubsetRatio) | Number of distinct values in the field (in the current table) as compared to the total number of distinct values of this field (in all tables).
JSON property name: qSubsetRatio |
| [Tags](https://help.qlik.com/en-US/sense-developer/November2025/Subsystems/NetSDKAPIref/Content/Qlik.Engine.IFieldInTableData.Tags.htm#Qlik_Engine_IFieldInTableData_Tags) | List of tags related to the field.
JSON property name: qTags |