---
title: "DB2: How to create user-defined data type"
description: "User-defined data types are like user-defined functions to create customized data types . https://srinimf.com/2015/11/06/how-concat-operator-and-concat-function-are-identical/. UDD Type Example. For e..."
url: https://srinimf.com/2012/05/27/db2-user-defined-data-type/
date: 2012-05-27
modified: 2026-10-10
author: "Srini"
categories: ["DB2"]
tags: ["db2", "UDT"]
type: post
lang: en
---

# DB2: How to create user-defined data type

[User-defined data types](https://srinimf.com/2022/12/24/these-are-user-defined-data-types-in-db2/) are like user-defined functions [to create](https://srinimf.com/2020/07/25/db2-user-defined-function-syntax-to-create-drop/) customized [data types](https://srinimf.com/2015/10/13/db2-large-object-data-types-advantage-of-lobs/).

Related[CONCAT Operator ‘||’ Vs. CONCAT Function – Are They Identical?](https://srinimf.com/2015/11/06/how-concat-operator-and-concat-function-are-identical/)

## UDD Type Example

For example, [CREATE DISTINCT TYPE](https://srinimf.com/2012/04/24/db2-why-cast-function-needed-2-of-2/) AUDIO AS BLOB(1M);

So now the “audio” becomes a new data-type. If we talk about user defined data types, there are 2 types.

### Distinct Type

In this case, the only user-defined type is customized based on an existing type

### Structured Type

```
CREATE TYPE PERSON_DET AS (NAME CHAR(20),
AGE INT,
ADDRESS ADDRESS_T,
INSTANTIABLE
REF USING VARCAHR(13) FOR BIT DATA
MODE [DB2 SQL](https://srinimf.com/2015/09/24/db2-sql-procedure-basics-for-mainframe-programmers-1-of-2/);
```

The basic difference is , we can create a structure with mix [of db2](https://srinimf.com/2015/06/05/sweet-spots-of-db2-v11-with-hadoop/) existing types and UDTs.

The usage for UDTs we can see in the Banking domain.  

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