order by date format with union in mysql -


i have used union order by, in resultant table date format not ordering.

(     select          date_format(date_1, '%m/%d/%y')  first_date,          null second_date,         col_2,         col_3,         col_4 table1 date_1 !='' ) union (     select          null first_date ,          date_format(date_2, '%m/%d/%y') second_date,          col_2,          null col_3,          col_4     table1      date_2 !='' ) order  date_1 desc, date_2 desc;

with above able retrieve records dates not ordered. help!

excerpt mysql reference

if column sorted aliased, order clause must refer alias, not column name.

    (         select              date_format(date_1, '%m/%d/%y')  first_date,              null second_date,             col_2,             col_3,             col_4 table1 date_1 !=''     )     union     (         select              null first_date ,              date_format(date_2, '%m/%d/%y') second_date,              col_2,              null col_3,              col_4         table1          date_2 !=''     )     order  first_date  desc, second_date desc;

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