---
title: "CompositeLongKey"
slug: "compositelongkey"
updated: 2022-02-10T13:40:36Z
published: 2022-02-10T13:40:36Z
canonical: "docs.datajet.app/compositelongkey"
---

> ## 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.

# CompositeLongKey

## General: CompositeLongKey

## Combined the specified low (L) and high(H) continuous integer fields into a continuous long integer field.

The intermediate field is defined as (L*M)+H

## Purpose

Use this function to:

- Combine two Integer keys into a single Long key.

## Return Value

| Property | Value |
| --- | --- |
| **FieldType** | LongInteger |
| **FieldSize** | Big Integer field with large unknown number of unique values |
| **DataType** | Continuous |
| **DataSize** | LongInteger |

```shell
Example Return Value:
```

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

## Parameters

| Parameter | JSON | Description |
| --- | --- | --- |
| **Table** | “targetTable”: “MyTableName” | The target table on which the new field will be created |
| **Filter** | “dataset”: {DataSet_JSON} | Optional. If a filter is applied, records not in the filter recordset will be returned as null. |
| **Function** | "function":"compositelongkey" | CompositeLongKey |
| **High Key** | “p1”: HighKeyFieldName | Required. - **Data Type:** Discrete - **Field Type:** Integer / LongInteger - **Data Size:** Integer DataSize must be INTEGER - supplying a field that is a SHORT or a LONG-INTEGER will generate an error. |
| **Low Key** | “p2”: LowKeyFieldName | Required. - **Data Type:** Discrete - **Field Type:** Integer / LongInteger - **Data Size:** Integer DataSize must be INTEGER - supplying a field that is a SHORT or a LONG-INTEGER will generate an error. |
| **Multiplier** | “p3”: MultiplierFieldName | Required. - **Data Type:** Discrete - **Field Type:** Integer / LongInteger |

## JSON Sample

```json
{
  "method": "BuildBakedField",
  "project": "D3",
  "targetTable": "transactions",
  "overwrite": true,
  "name": "CompLongKey",
  "function": "compositelongkey",
  "p1": "cid",
  "p2": "castprice",
  "p3": "Year"
}
```

**Usage Notes**

See Also:

- Engineering | Expression Field
- CombinedIndex (General Functions)

## Example

| Example | Details |
| --- | --- |
| **Description** | Combine integer fields to create key |
| **Input** | - Table: = [transactions] - Filter: = [No Filter] - **Function: = CompositeLongKey** - High Key:= cid - Low Key:= castprice - Multiplier:= Year - Name: =key-cid-price-year |
| **Sample** | ![](https://cdn.document360.io/73b6469b-c1e4-47e9-aa65-986c8ebd17ca/Images/Documentation/Gen_CompLongKey_Example.png) |