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Oracle – update the same count of duplicates between two tables

I have two tables UPD_REF and UPD_TO There is no key and we can have duplicates in both tables UPD_TO or UPD_REF. I need to update the same count of rows on UPD_TO corresponding to UPD_REF. If I do a simple update or merge like this: I have all the matching values updated: But I need to get that: Any

Mysql SQL syntax group by [asc|desc]?

In using mysql8.0 it gives the GROUP BY syntax as the following: [GROUP BY {col_name | expr | position} [ASC | DESC], … [WITH ROLLUP]] What is the usage of the asc or desc in the group by? Every …