Q&A Discussions

How many null values does a unique constraint accept in sql?

12th Jun 2021, 8:35 AM

Calvin Thomas

sql

0 Votes

How to send a field of form Null into database?

28th Apr 2020, 4:42 AM

Konala Teja Sri

php#webdeveloper

0 Votes

Can do this guys. Showing null value.Plz Help me out.

10th Nov 2022, 2:03 AM

parajal12

java oop program

0 Votes

How to fix this error 'cannot set properties of null (setting 'innerhtml')'?

20th May 2020, 5:22 PM

Student 31

html javascript website

0 Votes

Can I have a Double (object) with null value in Java?

25th Jul 2022, 3:56 PM

Wage

double java objects

1 Vote

What is null time exception error how to resolve it

20th Aug 2018, 1:27 PM

Andrés Felipe Moreno Torres

java static

0 Votes

Are there any reason why using NULL in pointer ? Why not 0?

2nd Dec 2016, 2:47 PM

Neeraj Vaid

c++

2 Votes

5 Answers

14th May 2017, 2:57 AM

Setiawan Next

PHP Warning: mysqli_real_escape_string() expects parameter 1 to be mysqli, null given in

$thevalue php

1 Vote

PHP Warning: mysqli_real_escape_string() expects parameter 1 to be mysqli, null given

6th May 2018, 9:21 PM

Kelly Arnold

1 be expects given in mysqli mysqli_fetch_assoc()mysqli_query()mysqli_result null parameter php to warning:

1 Vote

Как исправить ошибку" Cannot set property 'value' of null "?

6th Nov 2018, 7:04 AM

Keaikitse Zlatan Modise

html javascript

0 Votes

Why System.out when printed gives it's address and not null ?

23rd Dec 2016, 11:01 AM

ernwest

1 Vote

What's the difference between (NOT NULL + UNIQUIE) and Primary key.?

15th Feb 2018, 5:33 PM

SDJava

database dbms mysql oracle sql

0 Votes

How can I permanently delete all my data, my existence from SoloLearn Community?

1st Dec 2018, 12:16 AM

Kishor Jena

null void

2 Votes

Why do I get an error. Can't read value of null on getContext?

29th Mar 2017, 12:32 PM

Kinshuk Vasisht

javascript

1 Vote

trying to access array offset on value of type null in php 7.4

13th Apr 2022, 2:18 PM

Nate Washburn

if-statements

2 Votes

How to define default value of a variable containing null if it's null?

26th Dec 2020, 8:27 AM

Ramavtar Rajpoot

js prompt

2 Votes

How to use inArray to check whether an array contains null value?

30th Aug 2022, 11:38 AM

Parth

#inarray #javascript #jquery #php #sololearn #validation

0 Votes

"<div class="img"></div> " won't show when scrolling. I have this error: Cannot read property 'classList' of null

8th Jun 2018, 6:30 AM

anshu

#window.onscroll functions

3 Votes

What happens when we use arrow operator on NULL structure pointer ?

21st Dec 2018, 10:49 PM

noUseForAName

arrow_operator c null structure_pointer

0 Votes

When i am using name-it is escaping and it dispalys null pointer assignment??

29th Feb 2020, 2:55 PM

Chris Jones

input output

1 Vote

why its not working? it says cannot set elements (innerHTML) of null

2nd Apr 2019, 1:42 PM

Teja

html js

0 Votes

How do I stop calling a function when it returns NULL pointer? [C]

4th Dec 2017, 7:00 AM

Ashraful Ash

c functions memory null pointers

1 Vote

Is scanf () function automatically allocate space for null terminator like fgets()? In C

1st Jan 2020, 11:23 PM

ja008

null terminator

3 Votes

What is the solution for, cannot read property 'getcontext' of null canvas

14th Oct 2020, 6:24 AM

Yogeshwaran P

canvas html javascript

0 Votes

FIXED. (HELP: getElement returns null when it worked before! Tried to fix it all day and nothing changed.)

18th Mar 2019, 8:16 PM

Lweendela Kankoloto

bug getelementbyid help html javascript js null queryselector self-learning style

0 Votes

Why am I getting uncaught type error cannot read properties of null (reading 'push')

11th Jan 2024, 12:53 AM

Bianca Clara Correia Kusunoki

arrays crud debugger javascript json local-storage

0 Votes

Is there any simple way to declare a null array of size n in python?

1st Sep 2022, 3:55 PM

steve Purpose

array null python

0 Votes

Why document.getElementById("validId ") return null even though the document is loaded and the id is valid.

23rd Jun 2018, 2:23 PM

Akshaya Rajesh

javascript web

1 Vote

7 Answers

13th Mar 2018, 5:28 PM

josh mizzi

please help

null pointers

0 Votes

Hello good afternoon. How to declare Boolean data type member as a null in default constructor ?

17th Aug 2021, 4:51 PM

Rinchin Khandu Khochhilu

3 Votes

What is the diffrence (in examples) between undefined, null, NaN ?

11th Nov 2017, 9:51 AM

raix832

difrence nan null undefined

22 Votes

10 Answers

24th Apr 2019, 6:33 PM

Sławek J.

what is the use of null in rand ? how it is work

c++

0 Votes

Can any one tell java does not support pointer then why get null pointer exception.

4th Nov 2016, 7:07 AM

KG Feignh

java operators

1 Vote

Why mostly in c program using pointer pointer is daclared in this way ? *ptr = NULL

24th Oct 2018, 4:18 AM

DEVENDRA KUMAR

c pointers

1 Vote

4 Answers

6th Mar 2020, 8:17 AM

Yash Chaudhari

Why i would need to use "Null"?

c#null

0 Votes

6 Answers

12th Jan 2017, 6:59 PM

Mohamed Ammar

Do we need to set the object to null to invoke the destructor?

c#inheritance

1 Vote

I am getting null pointer while loading audit information,but audit is array

16th Jun 2016, 5:03 AM

Michael Aries Malaca

1 Vote

Is the order of NOT NULL and AUTO_INCREMENT statements after the column name important?

18th May 2017, 11:00 AM

Hari k

sql

0 Votes

Can someone please explain why (in what situation) a pointer is initialized with NULL?

17th Aug 2020, 11:09 PM

Ali Rezaei

c++null pointers

7 Votes

Why is this element null?

26th Jun 2018, 5:00 PM

N@G3

javascript null

1 Vote

{SOLVED!} JavaScript + Html Error - Uncaught TypeError: Cannot set property 'innerHTML' of null Line: 10

22nd May 2019, 12:53 AM

Archie

help html javascript js

0 Votes

how to remove or avoid the error of "exception in thread main java.lang null pointer exception"

27th Apr 2020, 8:28 PM

DevHaz

CREATE TABLE Users ( id int NOT NULL AUTO_INCREMENT, username varchar(40) NOT NULL, password varchar(10) NOT NULL, PRIMARY

1 Vote

5 Answers

24th Jul 2016, 5:59 PM

Mohammad Bhanpurwala

sql tables

3 Votes

6 Answers

14th Jul 2017, 2:24 PM

Ramesh

How do I change the image src attribute through javascript?

javascript null src

2 Votes

19th Jun 2020, 9:42 PM

tori the crafter 💛

Java Problem I

interfaces null

1 Vote

Please tell me difference between NIL and NULL..

9th Jul 2020, 6:00 AM

James Clark I. Vinarao

nil null

2 Votes

Why console is displaying error ??

25th Sep 2017, 1:33 PM

Mithun Verma

error javascript null

4 Votes

Why do we need to store a null value in vTable for a pure virtual function?

29th Oct 2018, 8:42 PM

Arushi Singhania

c++functions overriding polymorphism virtual

1 Vote

Why when using instanceof in java to a null variable the output would be flase

18th Mar 2018, 3:12 PM

Ashish Gaur

instanceof java

0 Votes