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 ==.
Related
This question already has answers here:
How to write ternary conditional operator?
(33 answers)
Closed 4 years ago.
What is the equivalent of this expression in Kotlin.
a ? b : c
This is giving error.
In Kotlin, if statements are expressions. So the following code is equivalent:
if (a) b else c
Hope it's working for you.
This question already has answers here:
T-SQL and the WHERE LIKE %Parameter% clause
(3 answers)
Closed 5 years ago.
I am trying to learn more about procedures in SQL, and so i am trying to do this:
CREATE PROCEDURE GetCarInformation
(#ModelName Varchar(256))
AS
Begin
SELECT Car.LicensePlate, CarBrand.ManufacturerName, CarModel.ModelName, CarSpecs.ModelYear, CarSpecs.Doors, CarSpecs.Seats, CarSpecs.ModelYear
FROM Car
INNER JOIN CarModel ON Car.ModelID = CarModel.ID
INNER JOIN CarBrand ON CarModel.ManufacturerID = CarBrand.ID
INNER JOIN CarSpecs ON CarModel.CarSpecsID = CarSpecs.ID
WHERE CarModel.ModelName LIKE '%#ModelName%'
END
But it doesn't seem to work, on the LIKE part of it.
It wont search correctly.
Is it because i am using it incorrectly ?
Or can't i add % with the #ModelName ? and single quotes ?
You should use
LIKE '%'+#ModelName+'%'
It's the way MSSQL use to CONCAT string . You can use CONCAT() too.
Please remember to use LIKE '%xxx%' with caution. It can have really bad effects on performances.
This question already has answers here:
Equals(=) vs. LIKE
(16 answers)
WHERE clause on SQL Server "Text" data type
(7 answers)
Closed 7 years ago.
what is the differences between = to like ?
thanks for help :)
by the way if it's help , the error i get is: the data types text and varchar are incompatible in the equal to operator [msg 402]
1:
Like
The LIKE operator is used to search for a specified pattern in a column.
Where
The WHERE clause is used to extract only those records that fulfill a specified criterion.
In your case the first query do not work is because no records match the criteria you are searching.
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.
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.