Dirty read - Changes made during a Transaction is 'visible' 
to other parties

Non Repeatable Read -

if Transcation T1 reads a row and Transcation T2 changes 
the same row,when T1 rereads and sees the changes made by 
T2.Then this is Non - Repeatable Read

Phantom Read - If Transcation T1 retrieves a bunch of 
rows.Transcation T2 inserts a row,T1 rereads the query and 
if T1 see the additional row,it is a ghost row to T1 then 
this is called as Phantom Read