postgresql - function to_char(unknown, unknown) is not unique -

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when running following query.select * surgicals to_char(dt_surgery ,'dd-mm-yyyy' ) = to_char('12-02-2012','dd-mm-yyyy');

the error coming 'sql state 42725: error: function to_char(unknown, unknown) not unique'

how run above select query?

you mean to_char('12-02-2012'::date, 'dd-mm-yyyy'). to_char cannot convert plain string string. still, not seem make sense, need 1 of these two, depending on format of date constant (which cannot determined actual example date provided):

select * surgicals to_char(dt_surgery ,'dd-mm-yyyy' ) = '12-02-2012'; select * surgicals to_char(dt_surgery ,'mm-dd-yyyy' ) = '12-02-2012';

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