There are two not equals operator - !=
and <>
.
What's the difference between them? I heard that !=
is more efficient than other for comparing strings. Could anyone give a qualitative comment on this statement.
They are the same (as is the third form, ^=
).
Note, though, that they are still considered different from the point of view of the parser, that is a stored outline defined for a !=
won't match <>
or ^=
.
This is unlike PostgreSQL
where the parser treats !=
and <>
yet on parsing stage, so you cannot overload !=
and <>
to be different operators.
There is no functional or performance difference between the two. Use whichever syntax appeals to you.
It's just like the use of AS and IS when declaring a function or procedure. They are completely interchangeable.
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