---
title: "LCAST"
slug: "lcast"
updated: 2023-07-11T18:29:20Z
published: 2023-07-11T18:29:20Z
canonical: "docs.datajet.app/lcast"
---

> ## 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.

# LCAST

## General: []

## Extract numeric data contained in a string or integer and store as a longinteger

## Purpose

Use this function to:

- Cast data from integer to longinteger (to support creation of joins)
- Cast data loaded as string to longinteger
- Filter records containing non-numeric data

## Return Value

| Property | Value |
| --- | --- |
| **FieldType** | Long(Integer) |
| **FieldSize** | Low / Med / High / Continuous |
| **DataType** | Discrete / Continuous |
| **DataSize** | Short / Integer / LongInteger / Double |

```json
Example Return Value: 321536
```

## 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":"" | String |
| String Function | “p1”: “” | LCAST(A) |
| A | “p2”: | Required. *Supports:* - **DataType:** Discrete/Continuous - **Field Type:** String, Integer - **Fixed Value:** #NNaANNuu, #NNN |
| **Treat Null as Zero** | "nullIsZero": true "nullIsZero": false | True/False. Default = False If true, then any null values in the input fields will be treated as if they have a value of 0. |

## JSON Sample

```json
{
  "method": "BuildBakedField",
  "project": "AllDataSource_03",
  "targetTable": "customer",
  "overwrite": true,
  "name": "LCAST frequency",
  "function": "string",
  "p1": "LCAST(A)",
  "p2": "frequency"
}
```

## Usage Notes

See Also:

- Engineering | Expression Field

## Example

| Example | Details |
| --- | --- |
| **Description** | Convert integer to longinteger |
| **Input** | - Table: = [transactions] - Filter: = [No Filter] - **Function: = String** - String Function:= LCAST(A) - A:=[customer].[cid] - Name: = lngCID |
| **Sample** |  |