MariaDB 10.5

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create table t (x int, y int)
insert into t values (1, 1)
update t set x = 1 where y = 1;

select row_count()

Rows matched: 1  Changed: 0  Warnings: 0

row_count()

0

update t set x = 2 where y = 1;

select row_count()

Rows matched: 1  Changed: 1  Warnings: 0

row_count()

1