---
title: "AddNullField"
slug: "addnullfield"
updated: 2026-05-11T14:15:00Z
published: 2026-05-11T14:15:00Z
canonical: "docs.datajet.app/addnullfield"
---

> ## Documentation Index
> Fetch the complete documentation index at: https://docs.datajet.app/llms.txt
> Use this file to discover all available pages before exploring further.

# AddNullField

Add a null field of specified field and datatype

| Key | Value(s) | Description |
| --- | --- | --- |
| method | "AddNullField" | Add a null field of specified field and datatype |
| datatype | "string" "double" "integer" "longinteger" "date" "datetime" | Data type of field |
| length |  | Optional Field length for fixed length strings |
| name | "FieldName" | Name of field to create |
| overwrite | true/false | Default = false Determines whether existing field will be overwritten |
| size | "byte" "short" "integer" "longinteger" | data storage type |
| table | "TableName" | Table to create field on |
| type | "discrete" "continuous" | Continuous or discrete |

```json
  {
    "method": "AddNullField",
    "overwrite": true,
    "name": "discrete-double-integer",
    "table": "sales",
    "type": "discrete",
    "dataType": "double",
    "size": "integer",
    "length": 0,
    "project": "Rg2-Demo"
  },
```

See Also:

- [Data Types](/v1/docs/getting-started-data-types)
- [AddNullFieldLike](/v1/docs/addnullfieldlike)