mysql - Making two sql fields require each other to be updated before changing -


i'm new sql , i'm trying figure out how make can't update 1 of fields in table without updating 1 of other fields @ same time. think have expand current trigger , appreciate offered.

the database called employeeinfo , table called tblemployee

the fields in table follows:

employeeaddress | employeepostcode --------------------------------------- 15 green lane   |   s63 0no

apologies if formatting off. thanks.

you should reference new old.. not on mysql syntax like. 

create trigger <trigger> before update on <table>    each row    begin        if (new.<column> = old.<column> or new.<column2> = old.<column2>)                <raise exception>        end if;    end;

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