How to drop function if it already exist in mysql -

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i have defined custom function in mysql (using rails 3 btw), beginning of definition that

create function source_name(source int(10))

this function works fine need drop mysql drop function statement.

this list of i've tried already, none works, raise exceptions:

drop function if exists source_name; drop function if exists source_name drop function if exists source_name(); drop function if exists source_name() drop function if exists 'source_name' drop function if exists 'source_name';

and have no idea next, every example find online looks different...


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