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)
Related
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:
SQL is null and = null [duplicate]
(4 answers)
Closed 8 years ago.
I am trying to count the number of missing postal codes using CASE to flag null values as 1, otherwise 0.
CASE WHEN ([postcode]=NULL)
THEN 1
ELSE 0 END AS pc_missing
Even though I know there are lots of missing data, none of them receive the value of 1.
What have I done wrong?
null is not a value - it's the lack of a value. null returns "unknown" (which is not true) when evaluated against any value operator - =, !=, >, <, etc. Instead, you should check it with the is [not] null operator:
CASE WHEN ([postcode] IS NULL)
THEN 1
ELSE 0 END AS pc_missing
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.
In oracle, it says to create a query that includes an employee column and a colleague column (works in the same department)
and I see part of the ff. query
WHERE e.employee_id <> c.employee_id
What does <> imply?
It means not equal to . It's the same as != in C-like languages.
<> (Not Equal To) Not equal to . also != is same
but <> is ISO Standard and
!= Not equal to (not ISO standard)
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.