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SQL NULL Values - IS NULL and IS NOT NULL

SQL Examples SQL Editor SQL Quiz SQL Exercises SQL Server SQL Syllabus SQL Study Plan SQL Bootcamp SQL Certificate SQL Training ... If a field in a table is optional, it is possible to insert or update a record without adding any value to this field. This way, the field will be saved with a NULL value.

w3resource.com › sql › insert-statement › insert-null.php

Sql inserting NULL values - w3resource

-- INSERT INTO statement begins INSERT INTO agents -- Specifies the table 'agents' where the data will be inserted VALUES ("A001","Jodi","London",.12,NULL); -- Specifies the values to be inserted into each column of the table: -- "A001" will be inserted into the 'agent_code' column (assuming it's a string data type) -- "Jodi" will be inserted into the 'agent_name' column -- "London" will be inserted into the 'working_area' column -- .12 will be inserted into the 'commission' column (assuming it's a numeric data type) -- NULL will be inserted into the 'salary' column, assuming it allows NULL values ... This SQL code attempts to perform an INSERT operation into the 'agents' table.

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geeksforgeeks.org › sql › how-to-insert-rows-with-null-values-in-sql

How to Insert Rows with NULL Values in SQL? - GeeksforGeeks

July 23, 2025 - In SQL, due to lack of data, we sometimes need to insert rows with NULL values in the tables. Here, the keyword NULL(without quotes) is used to represent no data.

w3schools.com › sql › sql_isnull.asp

ADD ADD CONSTRAINT ALL ALTER ALTER COLUMN ALTER TABLE AND ANY AS ASC BACKUP DATABASE BETWEEN CASE CHECK COLUMN CONSTRAINT CREATE CREATE DATABASE CREATE INDEX CREATE OR REPLACE VIEW CREATE TABLE CREATE PROCEDURE CREATE UNIQUE INDEX CREATE VIEW DATABASE DEFAULT DELETE DESC DISTINCT DROP DROP COLUMN DROP CONSTRAINT DROP DATABASE DROP DEFAULT DROP INDEX DROP TABLE DROP VIEW EXEC EXISTS FOREIGN KEY FROM FULL OUTER JOIN GROUP BY HAVING IN INDEX INNER JOIN INSERT INTO INSERT INTO SELECT IS NULL IS NOT NULL JOIN LEFT JOIN LIKE LIMIT NOT NOT NULL OR ORDER BY OUTER JOIN PRIMARY KEY PROCEDURE RIGHT JOIN ROWNUM SELECT SELECT DISTINCT SELECT INTO SELECT TOP SET TABLE TOP TRUNCATE TABLE UNION UNION ALL UNIQUE UPDATE VALUES VIEW WHERE MySQL Functions

scaler.com › home › topics › sql › null value in sql

NULL Value in SQL - Scaler Topics

March 28, 2024 - NULL can be inserted in any column by using the assignment operator "=". Also, to test whether a NULL is present or not we have to use certain operators, for example, IS NULL and IS NOT NULL.

Microsoft Learn

learn.microsoft.com › en-us › sql › t-sql › language-elements › null-and-unknown-transact-sql

NULL and UNKNOWN (Transact-SQL) - SQL Server | Microsoft Learn

To test for null values in a query, use IS NULL or IS NOT NULL in the WHERE clause. You can insert null values into a column by explicitly stating NULL in an INSERT or UPDATE statement, or by leaving a column out of an INSERT statement.

Microsoft Learn

learn.microsoft.com › en-us › answers › questions › 812578 › how-to-enter-null

How to Enter NULL - Microsoft Q&A

In Sql server2016,I was pasting data into a table, how do i enter 'null' into a cell? I try to some ways to get it, but failed.Hope to get support........ ... A Microsoft extension to the ANSI SQL language that includes procedural programming, local variables, and various support functions. ... Welcome to Microsoft T-SQL Q&A Forum! If I understand correctly, if you want to insert null on the empty column, you can try 2 ways.

stackoverflow.com › questions › 50005501 › sql-insert-from-select-with-null-values

SQL INSERT from select with NULL values - Stack Overflow

You should use Select INTO as ... TABLE2 has primary key 'X', 'Y') CREATE TABLE #TempPK (COLB int null); insert into #TempPK(COLB) values ('X'); insert into #TempPK(COLB) values ('Y');...

w3schools.com › mysql › mysql_null_values.asp

MySQL NULL Values - IS NULL and IS NOT NULL

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tutorialspoint.com › home › sql › sql null values

Understanding SQL NULL Values

November 29, 2009 - Here, NOT NULL signifies that column should always accept an explicit value of the given data type. You can insert NULL values into the columns where we did not use NOT NULL. Let us create a table with the name CUSTOMERS in the SQL database using the CREATE statement as shown in the query below −

stackoverflow.com › questions › 1149665 › how-do-you-insert-null-values-into-sql-server

how do you insert null values into sql server - Stack Overflow

INSERT INTO atable (x,y,z) VALUES ( NULL,NULL,NULL)

If you're using SSMS (or old school Enterprise Manager) to edit the table directly, press CTRL+0 to add a null.

docwiki.embarcadero.com › InterBase › 2020 › en › Inserting_Rows_with_NULL_Column_Values

Inserting Rows with NULL Column Values - InterBase

For example, the following statement stores a row into the DEPARTMENT table, assigns the values of host variables to some columns, and assigns a NULL value to other columns: EXEC SQL INSERT INTO DEPARTMENT (DEPT_NO, DEPARTMENT, HEAD_DEPT, MNGR_NO, BUDGET, LOCATION, PHONE_NO) VALUES (:dept_no, :dept_name, NULL, NULL, 1500000, NULL, NULL);

stackoverflow.com › questions › 68440600 › insert-sql-value-null-does-it-works-the-same-as-the-null-in-sql

Insert SQL value 'NULL' does it works the same as the NULL IN SQL? - Stack Overflow

They are different. When you enclose something in single quotes, it becomes a string -- this is true of all keywords in SQL, including NULL.

When you use just NULL, it is the SQL keyword, and it is compatible with all types.

So, these are quite different:

Copyinsert into t (col1, col2)
    values ('2021-05-25 11:58:41.000', NULL);

and:

Copyinsert into t (col1, col2)
    values ('2021-05-25 11:58:41.000', 'NULL');

'NULL' is a string and only compatible with a string type. You should get a type-conversion error if the column is not a string.

The one caveat is if you are storing the values in a text file for loading into the database. In such a file, strings may or may not be delimited with single quotes, depending on the structure of the file.

quora.com › How-do-you-add-null-values-in-SQL

How to add null values in SQL - Quora

Answer (1 of 3): NULL values are handled differently depending on whether they are in the context of a tuple or a set. In the case of a tuple: (e.g. 1 + NULL), the result is always NULL. This is because if any part of a tuple is missing or unknown then the entire tuple cannot be known and hence m...

Database Journal

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Working with NULL Values in SQL | DatabaseJournal.com

March 9, 2023 - The phone_number, salary, commission_pct, and manager_id columns can contain NULL values. This is achieved using the NULL keyword. ... You can insert NULL values into a table that allows NULL types by using the NULL keyword.

Vertabelo Academy

academy.vertabelo.com › course › sql-insert-update-delete › basics › insert › insert-null

How to INSERT, UPDATE, and DELETE Data in SQL - Online Course | Vertabelo Academy

INSERT INTO user (id, name, Age) VALUES (6, 'Chris', NULL);

dba.stackexchange.com › questions › 154439 › how-can-i-insert-data-into-a-null-record-in-a-column-that-allows-not-nulls

sql server 2012 - How can i insert data into a NULL record in a column that allows NOT NULLS? - Database Administrators Stack Exchange

As per the comments, I'm going to assume you're getting mixed up between update and insert.

 USE [DB_A] ;
 UPDATE dbo.address
 SET City = 'test',
     State = 'ing'
 WHERE City IS NULL ;

And

 USE [DB_A] ;
 UPDATE dbo.address
 SET City = NULL,
     State = NULL
 WHERE City = 'test' ;

I think you're there otherwise :-)

geeksforgeeks.org › sql › how-to-set-a-column-value-to-null-in-sql

How to Set a Column Value to Null in SQL? - GeeksforGeeks

NULL: It represents the NULL value in SQL. WHERE: This statement has an optional part that specifies which rows should be updated. column_name: The name of the column you want to update should be replaced here. Firstly, let's create a table using the CREATE TABLE command: -- create a table CREATE TABLE students (Sr_No integer,Name varchar(20), Gender varchar(2)); -- insert some values INSERT INTO students VALUES (1, 'Nikita', 'F'); INSERT INTO students VALUES (2, 'Akshit', 'M'); INSERT INTO students VALUES (3, 'Ritesh', 'F'); INSERT INTO students VALUES (4, 'Himani', 'F'); -- fetch some values SELECT * FROM students ;

Published July 23, 2025

sqlzap.com › blog › how-to-insert-a-null-value-in-sql

How to Insert a NULL Value in SQL

Just use the keyword NULL (without quotes) in your INSERT statement. DON’T use quotes: ‘NULL’ is a string, not a NULL value. Check for NOT NULL constraints: Some columns might not allow NULL values. Use IS NULL or IS NOT NULL to compare: = NULL won’t work!

help.hcl-software.com › hclinformix › 1410 › sqs › ids_sqs_0875.html

Inserting NULL Values

INSERT INTO orders (orders_num, order_date, customer_num) VALUES (0, NULL, 123);