php - MySQL: <>1 works but =0 doesn't -


when send query like

select id private_messages to_id=1 , opened=0

it doesn't return anything

select id private_messages to_id=1 , opened<>1

returns results opened=0. opened columns type enum "1" , "0" (default) values. question is, why first query doesn't return anything?

since opened enum, should write:

select id private_messages to_id=1 , opened='0'

enums set of possible strings. the documentation:

an enum string object value chosen list of permitted values enumerated explicitly in column specification @ table creation time.


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