This question already has answers here:
Should I use != or <> for not equal in T-SQL?
(14 answers)
Closed 9 years ago.
I was working in MSSQL server 2012. I wrote a query
select * from Mytable where col1 is not null and col1 != ''
and
select * from Mytable where col1 is not null and col1 <> ''
Both returns same value. I am just curious to know, what is the actual difference between <> and != operators?
My understanding is that there is no difference. The <> operator is the ANSI SQL standard inequality operator, while Microsoft included != to make it like some programming languages.
!= is not ANSI compliant.
That's all.
Use <>
UPD. Oh, here
Technically there is no difference between != and <>. Both of them work the same way and there is absolutely no difference in terms of performance or result.
Related
This question already has answers here:
How to rewrite IS DISTINCT FROM and IS NOT DISTINCT FROM in SQL Server 20008R2?
(10 answers)
Closed 2 years ago.
Does SQL Server have an operator equivalent to the Ansi SQL operators : IS DISTINCT FROM / IS NOT DISTINCT FROM ?
I know I can replace :
value1 is not distinct from value2
with :
(value1 = value2) or (value1 is null and value2 is null)
or :
coalesce(value1, -1) = coalesce(value2, -1)
But these options will prevent the engine to use an index, so does SQL Server have an specific operator to check this comparison ?.
Thank you.
No.
Unfortunately, SQL Server does not implement the null-safe operator, unlike other databases such as Postgres (wich suports the standard IS DISTINCT FROM operator), or MySQL (that has an extension operator called <=>).
So you are basically stucked with the following construct:
(value1 = value2) or (value1 is null and value2 is null)
This question already has answers here:
Should I use != or <> for not equal in T-SQL?
(14 answers)
Closed 6 years ago.
Using SQL Server 2008 I have a query which resembles this:
SELECT *
FROM myTable mt
WHERE mt.ID !=0
What is the !=0 ? It looks like it's the same as saying <> 0.
I am unable to google this, is this in fact the same? A link to some documentation would be appreciated.
It is exactly the same operator as <>.
See MSDN for reference.
This is the C convention for "not equal". There is another C convention for "equal" that looks like ==.
This question already has answers here:
Should I use != or <> for not equal in T-SQL?
(14 answers)
What is difference between operater != and <> in SQL Server? [duplicate]
(3 answers)
Closed 9 years ago.
What is difference between != and <> operators in Sql Server?
Since both are used as not operator. E.g :
select * from TableName where ColName <> value
or
select * from TableName where ColName != value
returns same values (Rows).
There is no difference. You can use both in MSSQL.
The MSSQL doc says:
!= functions the same as the <> (Not Equal To) comparison operator.
But <> is defined in the ANSI 99 SQL standard and != is not. So not all DB engines may support it and if you want to generate portable code I recommend using <>.
Most of the databases support both != and <> as not equal comparison operators. <> means either less than or greater than (i.e. not equal to) and was introduced because not all the keyboards used to have the exclamation ! key (a long time ago). Some databases like Oracle also support ^= for not equals.
I am confused and did not find in Google. Can anyone tell me What is Sql <> operator name?
<> is NOT Equal to, it's the same as !=
It's "not equal". Look in the list of operators for the database you're using, and find the appropriate section (usually "comparison operators"). For example:
SQL server
MySQL
Oracle
Postgres
It is the not equals operator.
Usage:
select *
from table
where foo <> 0
It is the Not Equal operator, but I am going to have to be verbose to get my answer posted because I haven't entered enough characters yet.
<> means not equal same as !=
Checks if the values of two operands are equal or not, if values are not equal then condition becomes true. (a <> b) or (a != b) is true.
Here is the answer – Technically there is no difference between != and <>. Both of them work the same way and there is absolutely no difference in terms of performance or result.
If != and <> both are the same, which one should be used in SQL queries?
You can use either != or <> both in your queries as both technically same but I prefer to use <> as that is SQL-92 standard.
This question already has answers here:
Closed 10 years ago.
Possible Duplicate:
Oracle <> , != , ^= operators
in sql, what is the difference between <> and !=, we can use both for "NOt Equal to".
is there any difference in between them?
ex.
select * from student where no != 2;
&
select * from student where no <> 2;
is any advantage of using one insted of another?
What are the main factors because of which != is not made as ISO standard
For SQL Server:
They are the same. Both are two Not Equal To operators. But != is not ISO standard, as quoted from Comparison Operators:
<> (Not Equal To) Not equal to
!= (Not Equal To) Not equal to (not ISO standard)