do database transactions prevent other users from interfering with it

Question

Suppose I do (note: the syntax below is probably not correct, but don\'t worry about it...it\'s just there to make a point)

Start Transaction
INSERT INTO tab         


        

Answer 1

As other user is updating the same row, row level lock will be applied. So he is able to make change only after your transaction ends. So you will be seeing the result set that you inserted. Hope this helps.