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stackoverflow.com › questions › 5658457 › not-equal-operator-on-null

<> is Standard SQL-92; != is its equivalent. Both evaluate for values, which NULL is not -- NULL is a placeholder to say there is the absence of a value.

Which is why you can only use IS NULL/IS NOT NULL as predicates for such situations.

This behavior is not specific to SQL Server. All standards-compliant SQL dialects work the same way.

Note: To compare if your value is not null, you use IS NOT NULL, while to compare with not null value, you use <> 'YOUR_VALUE'. I can't say if my value equals or not equals to NULL, but I can say if my value is NULL or NOT NULL. I can compare if my value is something other than NULL.

Answer from OMG Ponies on Stack Overflow

W3Schools

w3schools.com › sql › sql_null_values.asp

SQL NULL Values - IS NULL and IS NOT NULL

SELECT column_names FROM table_name WHERE column_name IS NOT NULL; Below is a selection from the Customers table used in the examples: The IS NULL operator is used to test for empty values (NULL values). The following SQL lists all customers with a NULL value in the "Address" field:

Stack Overflow

stackoverflow.com › questions › 5658457 › not-equal-operator-on-null

sql - Not equal != operator on NULL - Stack Overflow

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Working with SQL NULL values | Null Handling Functions - YouTube

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Solving SQL Issues with Select Where Not Exists with Nulls - YouTube

SQL: Handle Case When Null Issues FAST - YouTube

dba.stackexchange.com › questions › 333948 › not-equal-to-operator-is-not-returning-null-values-in-sql-server

query - Not equal to operator is not returning NULL values in SQL Server - Database Administrators Stack Exchange

Top answer

1 of 6

Consider checking documentation:

NULL indicates that the value is unknown. A null value is different from an empty or zero value. No two null values are equal. Comparisons between two null values, or between a null value and any other value, return unknown because the value of each NULL is unknown.

2 of 6

If you consider that the value of istrue is unknown in the NULL case then it might or might not equal 1.

The expression istrue != 1 then evaluates to unknown

SQL only returns rows where the WHERE clause evaluates to true.

If you are on SQL Server 2022+ you can use

WHERE istrue IS DISTINCT FROM 1

To give the inequality semantics that you want (Fiddle).

DB Vis

dbvis.com › thetable › sql-not-equal-operator-definitive-guide-with-examples

SQL Not Equal Operator: Definitive Guide with Examples

October 14, 2024 - In other words, the non-standard syntax for the SQL not equal comparison operator is: ... Note that if any of the two expressions is NULL, the result of the not equal comparison is NULL.

MSSQLTips

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SQL NOT EQUAL Examples

December 31, 2024 - These operators can be used interchangeably in SQL Server. The ANSI standard operand is <> (greater than – less than) and may be preferred by some organizations as it is more likely to work on other platforms and thus increases the likelihood of cross-platform code reusability. The “NOT Value =” is quite unpopular and none of the code examples in this tip will use it. WHERE SalespersonPersonID != 2 WHERE NOT SalespersonPersonID = 2 · Working with NULL values can yield unexpected results.

Quora

quora.com › How-do-you-write-not-equal-to-null-in-an-SQL-query

How to write not equal to null in an SQL query - Quora

Answer: A comparison with NULL using the normal comparison operators will always return false, i.e. [code ]NULL = NULL[/code] is false in SQL. To account for this we use the special [code ]IS[/code] and [code ]IS NOT[/code] operators to check ...

Andycarter

andycarter.dev › blog › mysqls-not-equal-operator-doesnt-match-null-values

MySQL's not equal operator doesn't match null values – Andy Carter

The 'About' and 'Support' pages have null values for the template_id which means MySQL doesn't know if they could be 1 or not. To get the correct result, we need to include a condition for the null values: SELECT * FROM pages WHERE template_id != 1 OR template_id IS NULL; This will give us all pages except for the 'Home' page. There's another way of writing this, which is even simpler. We can use the null-safe equals operator (<=>):

DataCamp

datacamp.com › tutorial › sql-not-equal

SQL NOT EQUAL Operator: A Beginner's Guide | DataCamp

December 10, 2024 - Yes, <> and != serve the same purpose in SQL, representing inequality. However, <> is preferred as it aligns with ISO standards, making queries more universally interpretable. No, the NOT EQUAL operator does not handle NULL values directly.

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Simplilearn

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SQL Not Equal To Operator - Syntax & Examples

September 9, 2025 - Learn about the

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Microsoft Learn

learn.microsoft.com › en-us › sql › t-sql › language-elements › not-equal-to-transact-sql-exclamation

!= (Not Equal To) (Transact-SQL) - SQL Server | Microsoft Learn

Applies to: SQL Server Azure SQL ... is not equal to another expression (a comparison operator). If either or both operands are NULL, NULL is returned....

Oracle

forums.oracle.com › ords › apexds › post › sql-if-value-is-null-not-equal-does-not-work-4157

sql if value is null not equal does not work - Oracle Forums

August 18, 2020 - I have the below query, but the AND pd.FROMLOC 'DMS' does not work if the column has {null} is there a workaround? SELECT pd.wavekey, pd.orderkey, o.externorderkey, pd.pickdetailkey...

Microsoft Learn

learn.microsoft.com › en-us › answers › questions › 69728 › sql-if-value-is-null-not-equal-does-not-work

sql if value is null not equal does not work - Microsoft Q&A

I have the below query, but the AND pd.FROMLOC <> 'DMS' does not work if the column has {null} is there a workaround? SELECT pd.wavekey, pd.orderkey, o.externorderkey, pd.pickdetailkey, pd.status, pd.fromloc, pd.loc, pd.sku, pd.qty,…

Microsoft

social.msdn.microsoft.com › Forums › en-US › d811dc74-daba-4942-91eb-2f1fadaa9f3d › sql-not-equal-clause-ignores-null-value

SQL Not Equal clause ignores NULL value | Microsoft Learn

... select * from ( select 'A' ... returns only 'B' and not returning NULL values. ... This is by design. NULL is not equal (or unequal) to anything....

Coginiti

coginiti.co › home › analysis › compare values when one is null

How to Compare Two Values in SQL When One Is Null - Coginiti

February 1, 2024 - When one value is null in SQL, you cannot directly compare it to any other value using comparison operators such as “=”. Instead, you need to use the IS NULL or IS NOT NULL operator to check whether a value is null.

Microsoft Learn

learn.microsoft.com › en-us › sql › t-sql › queries › is-null-transact-sql

IS NULL (Transact-SQL) - SQL Server | Microsoft Learn

... If the value of expression is NULL, IS NULL returns TRUE; otherwise, it returns FALSE. If the value of expression is NULL, IS NOT NULL returns FALSE; otherwise, it returns TRUE.

Upscale Analytics

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SQL Server IS NULL Operator - Upscale Analytics

September 9, 2020 - In SQL Server, to handle comparison with NULL values, you need to use the following SQL Server operators: IS NULL – equals the operation ‘= NULL’ (records with NULL values) IS NOT NULL – equals the operation ‘<> NULL’ (records without NULL values)

Enterprise DNA

blog.enterprisedna.co › sql-not-equal-operator

SQL Not Equal Operator: A Detailed Guide for Beginners – Master Data Skills + AI

Both can be used interchangeably, but <> is aligned with the ANSI SQL standard, making it more portable and compatible across different database systems. To use NOT NULL with NOT EQUAL operators in a query, combine the NOT NULL and NOT EQUAL conditions in your WHERE clause with the AND keyword as ...

W3Schools

w3schools.com › mysql › mysql_null_values.asp

MySQL NULL Values - IS NULL and IS NOT NULL

SELECT column_names FROM table_name WHERE column_name IS NOT NULL; Below is a selection from the "Customers" table in the Northwind sample database: The IS NULL operator is used to test for empty values (NULL values). The following SQL lists all customers with a NULL value in the "Address" field:

Valuedrivenanalytics

valuedrivenanalytics.com › home › where not equal in sql

WHERE Not EQUAL in SQL - Value Driven Analytics

January 26, 2024 - The basic syntax of the “WHERE NOT EQUAL” clause involves specifying a column or expression followed by the NOT EQUAL operator (!= or <>), and then providing a value or another expression to compare against.

SQL Server Tutorial

sqlservertutorial.net › home › sql server basics › sql server null

SQL Server NULL, Three-valued Logic, and IS NULL Opeartor

September 24, 2024 - NULL = 0 NULL <> 0 NULL > 0 NULL = NULLCode language: SQL (Structured Query Language) (sql) The NULL does not equal anything, not even itself.