Is there an md5sum for tables?

Hi all,
I need to know if multiple tables have (may have most probably) identical content.
Since I want a fast solution (which means not comparing tables row by row),
I thought it would be a good idea to have an sql function operating on a table or view
similar to md5sum on a file and only compare the generated hashes.
I did not find such a function in the documentation.

Is such a function already available?
If not, does it make no sense to use such an approach?

Regards,
Michael

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