What is the difference between null values in oracle and mysql

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In oracle and mysql, null means empty, but there are differences between them. In oracle, null and''are equivalent, but in mysql, null and' 'are not equivalent. We can do a simple experiment.

Oracle Test:

Mysql Test:

Thus it can be seen that''is different from null in different databases. In oracle,''is equivalent to null, but we can't use''= null 'when writing sql, only''is null. In mysql,''is equivalent to not null, just like we can't use''null' when writing sql, we can only use''is not null.

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