copy data from one field to another mysql mulitple rows -

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i want copy data 1 field mysql mulitple rows.

i've tried following not working , mysql says "returns more 1 row" 

update agreement  set _date2 = (select concat(substring(_date, 7), '-', substring(_date, 4, 2),      '-', substring(_date, 1, 2)) newdd   agreementtemp);

try 

update `table_name` set  destination_field=source_field

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