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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
PostgreSQLwhere the parser treats!=and<>yet on parsing stage, so you cannot overload!=and<>to be different operators.