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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).
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Difference between SQL Not Equal Operator <> and != to do inequality test between two expressions. Both operators give the same output. The only difference is that '<>' is in line with the ISO standard while '!= ' does not follow ISO standard.
Both are valid, but '<>' is the SQL-92 standard.
Not Equal Operator: != Evaluates both SQL expressions and returns 1 if they are not equal and 0 if they are equal, or NULL if either expression is NULL. If the expressions return different data types, (for instance, a number and a string), performs type conversion.
More Detail. The symbol <> in MySQL is same as not equal to operator (!=). Both gives the result in boolean or tinyint(1). If the condition becomes true, then the result will be 1 otherwise 0.
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 <>.
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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.
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