---
title: "A eq B eq C eq D"
slug: "flogicfunction-2"
updated: 2021-12-16T08:21:12Z
published: 2021-12-16T08:21:12Z
canonical: "docs.datajet.app/flogicfunction-2"
---

> ## 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.

# A eq B eq C eq D

## FLogic: A=B=C=D

## Creates a flag field with value 1 where inputs A,B,C and D are all equal, and value 0 where any of the inputs do not match

## Purpose

Use this function to:

- Identify records where 4 fields have the same value
- Flag records where statement A=B=C=D is true
- Compare multiple fields or values simultaneously

## Return Value

| Property | Value |
| --- | --- |
| **FieldType** | Integer |
| **FieldSize** | Low |
| **DataType** | Discrete |
| **DataSize** | Byte |

```shell
Example Return Value: 0, 1, null
```

*![](https://cdn.document360.io/73b6469b-c1e4-47e9-aa65-986c8ebd17ca/Images/Documentation/FLog_ABCD_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”: “flogic” | FLogic |
| **Logic Function** | "p1":"A=B=C=D" | A=B=C=D |
| **A** | “p2”: “FieldName” “p2”: “#N*.N*” “p2”: “#N*” “p2”: “#MyString” “p2”: “#YYYY-MM-DD” | Required. Field or value to compare with value B *Supports:* - **DataType:** Discrete / Continuous - **Field Type:** Any - **Fixed Value:** #N* e.g. #201596, #-87 - **Fixed Value:** #N*.N* e.g. #201596.05, #-87.98 - **Fixed Value:** #MyStringValue e.g. #Product1 #-This is also a valid string - **Fixed Value:** #YYYY-DD-MM e.g. #2021-12-06 |
| **B** | “p2”: “FieldName” “p2”: “#N*.N*” “p2”: “#N*” “p2”: “#MyString” “p2”: “#YYYY-MM-DD” | Required. Field or value to compare with value C *Supports:* - **DataType:** Discrete / Continuous - **Field Type:** Any - **Fixed Value:** #N* e.g. #201596, #-87 - **Fixed Value:** #N*.N* e.g. #201596.05, #-87.98 - **Fixed Value:** #MyStringValue e.g. #Product1 #-This is also a valid string - **Fixed Value:** #YYYY-DD-MM e.g. #2021-12-06 |
| **C** | “p3”: “FieldName” “p3”: “#N*.N*” “p3”: “#N*” “p3”: “#MyString” “p3”: “#YYYY-MM-DD” | Required. Field or value to compare with value D *Supports:* - **DataType:** Discrete / Continuous - **Field Type:** Any - **Fixed Value:** #N* e.g. #201596, #-87 - **Fixed Value:** #N*.N* e.g. #201596.05, #-87.98 - **Fixed Value:** #MyStringValue e.g. #Product1 #-This is also a valid string - **Fixed Value:** #YYYY-DD-MM e.g. #2021-12-06 |
| **D** | “p4”: “FieldName” “p4”: “#N*.N*” “p4”: “#N*” “p4”: “#MyString” “p4”: “#YYYY-MM-DD” | Required. Field or value to compare with value C *Supports:* - **DataType:** Discrete / Continuous - **Field Type:** Any - **Fixed Value:** #N* e.g. #201596, #-87 - **Fixed Value:** #N*.N* e.g. #201596.05, #-87.98 - **Fixed Value:** #MyStringValue e.g. #Product1 #-This is also a valid string - **Fixed Value:** #YYYY-DD-MM e.g. #2021-12-06 |

Special test cases

- To test for null, use **#null**
- To test for an empty string, use **#**

## JSON Sample

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

## Usage Notes

See Also:

- Engineering | Expression Field
- Hotbar >> Right-click | Save | Save As Field
- A=B, A=B=C...  (FLogic Functions)

## Example

| Example | Details |
| --- | --- |
| **Description** | Flag record if all 4 fields have same value |
| **Input** | - Table: = [customer] - Filter: = [No Filter] - Function: = FLogic - **Logic** **Function** **= A=B=C=D** - A:= [customer ].[IsDevelopment] - B:= [customer ].[IsTopDecile] - C:= [customer ].[IsMarried] - D:= [customer ].[IsOver50] - Name: = AllOrNone |
| **Sample** | ![](https://cdn.document360.io/73b6469b-c1e4-47e9-aa65-986c8ebd17ca/Images/Documentation/FLog_ABCD_Example.PNG) |