How can i now the number of rows afected by the last query?

how can i now the number of rows afected by the last query?
For example:
i made this update :
update trl_trial set status = 1 /* Validation */
where trial_id = cobject_id
and status = 0; /* Initial */
if NUMBERS_OF_ROWS = 0 then
end if;
how can i do this?
thank u!!!! Do the following :
update trl_trial set status = 1 /* Validation */
where trial_id = cobject_id
and status = 0; /* Initial */
if(SQL%ROWCOUNT = 0 ) then
else
end if;
you can also declare a variable and do
myvar := SQL%ROWCOUNT;
SQL%ROWCOUNT returna the # of rows afected by any sql
statement, like DELETE, UPDATE

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