mysql : check the content change or not

[lomalove]

i want to know how to find the column value change or notExample :table name = exam \[code\] a b c 12a 32 sdf 23s df fds\[/code\]if i can search the row which c column have "fds".Query:\[code\] select * from exam where c='fds';\[/code\]but the same time,i have to check the all the field value is change or not.thanks in advance