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I would like to know if there are any differences in between the two not equal operators <> and != in Oracle.
Are there cases where they can give different results or different performance?
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If != and <> both are the same, which one should be used in SQL queries? Here is the answer – You can use either != or <> both in your queries as both technically same but I prefer to use <> as that is SQL-92 standard.
Both are valid, but '<>' is the SQL-92 standard.
It (<>) is a function that is used to compare values in database table. != (Not equal to) functions the same as the <> (Not equal to) comparison operator. Follow this answer to receive notifications.
!= is a binary operator that returns true if its two arguments are not equal to each other. NOT is a unary operator, which reverses its argument, a Boolean expression.
No there is no difference at all in functionality.
(The same is true for all other DBMS - most of them support both styles):
Here is the current SQL reference: https://docs.oracle.com/database/121/SQLRF/conditions002.htm#CJAGAABC
The SQL standard only defines a single operator for "not equals" and that is <>
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Actually, there are four forms of this operator:
<>
!=
^=
and even
¬= -- worked on some obscure platforms in the dark ages
which are the same, but treated differently when a verbatim match is required (stored outlines or cached queries).
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