Which of the following is not a valid sql command? (points : 2) update acctmanager set amedate = sysdate where amid = 'j500';
update acctmanager set amname = upper(amname);
update acctmanager set amname = upper(amname) where amid = 'j500';
update acctmanager where amid = 'j500';

UPDATE acctmanager WHERE amid = 'J500';

Explanation:

The statement written above is not valid SQL statement because there is no SET after UPDATE. Update is always used with SET.If you are updating something then you need to specify the value with which that value should be replaced.

UPDATE acctmanager SET amname = UPPER(amname);

This statement does not contains WHERE clause but it will run all the values of amname column will get updated in the table acctmanager.

the answer will be d