---
title: "LongSequenceKey"
slug: "longsequencekey"
updated: 2022-02-10T19:30:49Z
published: 2022-02-10T19:30:49Z
canonical: "docs.datajet.app/longsequencekey"
---

> ## 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.

# LongSequenceKey

## General: LongSequenceKey

## Produces a field that is the record number in a table, stored as a continuous long integer

## Purpose

Use this function to:

- Create a unique primary key on an existing table where the number of records may exceed 2 billion
- Identify and select specific records by number

## Return Value

| Property | Value |
| --- | --- |
| **FieldType** | LongInteger |
| **FieldSize** | Continuous |
| **DataType** | Continuous |
| **DataSize** | LongInteger |

```shell
Example Return Value: 1.....N where N = number of records in the table.
```

FieldSize and DataSize will depend on the number of records in the table:

- LongSequenceKey will be a Continuous DataSize and FieldSize. See **FieldType and DataTypes** for more information.
- LongSequenceKey is valid for a stupidly large number of records **(+- 263 -1)**. For tables larger than this, find a quantum computer…

![](https://cdn.document360.io/73b6469b-c1e4-47e9-aa65-986c8ebd17ca/Images/Documentation/Gen_LongSeqKey_Sample.PNG)

## Parameters

| Parameter | JSON | Description |
| --- | --- | --- |
| **Table** | “targetTable”: “MyTableName” | The target table on which the new field will be created |
| **Filter** | “dataset”: {DataSet_JSON} | **NOT USED** |
| **Function** | "function":"longsequencekey" | LongSequenceKey |

## JSON Sample

```json
{
  "method": "BuildBakedField",
  "project": "D3",
  "targetTable": "transactions",
  "overwrite": true,
  "name": "LongKey",
  "function": "longsequencekey"
}
```

## Usage Notes

LongSequenceKey does not support filters.

See Also:

- Engineering | Expression Field
- IntegerSequenceKey  (General Functions)
- MakeContinuousKey (General Functions)

## Example

| Example | Details |
| --- | --- |
| **Description** | **Create Unique Key of record number** |
| **Input** | - Table: = [transactions] - *Filter: = [No Filter]* - **Function: = LongSequenceKey** - Name: = LongKey |
| **Sample** | ![](https://cdn.document360.io/73b6469b-c1e4-47e9-aa65-986c8ebd17ca/Images/Documentation/Gen_LongSeqKey_Example.png) |