---
title: "Here are Top Questions – Useful for DB2 Certification"
description: "Mostly asked certification questions in DB2. You need more focus on these areas before you take the test."
url: https://srinimf.com/2018/04/19/db2-certification-questions/
date: 2018-04-19
modified: 2026-10-10
author: "Srini"
image: https://i0.wp.com/srinimf.com/wp-content/uploads/2018/04/pexels-photo-7775459.jpeg?fit=1880%2C1253&ssl=1
categories: ["Categories", "Mainframe DB2"]
tags: ["DB2 certification questions", "DB2 constraints", "DB2 Tips and Solutions"]
type: post
lang: en
---

# Here are Top Questions – Useful for DB2 Certification

The point what I want to share with you is in DB2 certification what kind of questions you need to put more focus. These are DB2 constraints.

> According to IBM, A constraint is a rule that is used for optimization purposes

Related[DB2 v10- Exam Questions for Certification Use](https://srinimf.com/2014/02/01/db2-10-certification/)

There are many constraints in DB2. NOT NULL constraints, default constraints, CHECK constraints, UNIQUE constraints, and referential integrity constraints.

**I don’t have to be smarter than anybody else. I’ve just plain worked harder and longer than anybody else. *Graham Hawkes***

**NOT NULL constraint**–* constraint* is a rule that prevents null values from being entered into one or more columns within a table

**Default constants-**DEFAULT constraint provides a default value to a column

**Check Constraints-**sets restrictions on data added to a specific table. For example, a table check constraint can ensure that the salary level for an employee is at least Rs:10,000 whenever salary data is added or updated in a table containing personnel information.

**UNIQUE constraints**-Avoids duplicates. It is a rule that forbids duplicate values in one or more columns within a table.

**Referential Integrity constraints-**You can define primary key and foreign key constraints to define relationships between tables.

**Also read**

- [How to Understand Triggers in DB2 SQL Context](https://srinimf.com/2015/09/17/4-types-of-triggers-in-db2/)DateSeptember 17, 2015
- [DB2 Check Vs. Default Constraint Top Differences](https://srinimf.com/2021/10/30/db2-check-vs-default-constraint-top-differences/)DateOctober 30, 2021
- [Here is The Permissible Length of DB2-Object-Names](https://srinimf.com/2014/09/01/maximum-limits-on-db2/)DateSeptember 1, 2014

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