What is null give an example to described testing for null, Ask an Expert

Programming

What is NULL? Give an example to described testing for NULL in SQL?

The NULL SQL keyword is used to represent either a missing value or a value which is not applicable in a relational table. Consider there is a relation:

Person(id, name, address, phone)
Now to search ids and names of person who do not have a phone is:
Select id, name
from Person
where phone is null

View complete question

DBMS, Programming

Category:- DBMS
Reference No.:- M9545808

Have any Question?Write your Review or question?

Related Questions in DBMS

Question 1 what isdata-manipulation language dml there are

Question: 1. What isData-Manipulation Language (DML)? There are four types of access in DML, explain each one. 2. Assume we have a Library Database consists of the following relations: author(author_id, first_name, last_ ...

Question find at least two academic sources that describe

Question: Find at least two academic sources that describe the movement of Enterprise resource planning (ERP) activities to the cloud. Discuss the types of ERP activities that can be conducted in the cloud and the pros a ...

Question 1 unified communications system eg email

Question: 1. Unified Communications System (e.g., email, conferencing, and messaging) - The local area network is slower than needed, especially for newer, cloud-based applications. The email system needs refurbishment a ...

Objectivethe objective of this lab is to be familiar with a

OBJECTIVE: The objective of this lab is to be familiar with a process in big data modeling. You're required to produce three big data models using the MS PowerPoint software. This tool is available on UMUC Virtual Deskto ...

You can work on this assignment individually or in a group

You can work on this assignment individually or in a group of 2. If you are working in a group please establish a group in Assignment 2 Group on Canvas In this assignment you are asked to explore the use of neural networ ...

Question create an erd for the following scenario once you

Question: Create an ERD for the following scenario. Once you submit you will get access to the correct way to create the ERD. Please watch the video and correct any errors in your submission and resubmit. A small company ...

You are responsible for keeping track of meal expenses for

You are responsible for keeping track of meal expenses for ten employees while at a business lunch to which your employer has invited you to attend. Write an algorithm that inputs the lunch costs for each the ten employe ...

Real time analytics - data analytics assignment -this is a

Real Time Analytics - Data Analytics Assignment - This is a business analytics project aimed at generating innovative analytics solutions for a Global Food Consulting firm working in the area of Animal agriculture and fa ...

Systems analysis project scenic routes operates a bus

Systems analysis project Scenic Routes operates a bus company that specializes in travelling on secondary roads, rather than Interstate highways. Their slogan is: "It Takes a Little Longer, But It's Scenic." The firm nee ...

Sql injection on a searchthe way search performs its task

SQL injection on a search The way Search performs its task is by executing the following query (in a php script): $var=stripslashes($_POST['search']); $query = "SELECT username from lab1_login where use ...

4,153,160 Questions Asked
13,132 Experts
2,558,936 Questions Answered

Ask Experts for help!!

Looking for Assignment Help?

Start excelling in your Courses, Get help with Assignment

Write us your full requirement for evaluation and you will receive response within 20 minutes turnaround time.

Ask Now Help with Problems, Get a Best Answer

Recent Questions

Ask DBMS Expert