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Questions about "varchar" NOT NULL default = char(1) ?

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Greetings,

If one column "col1" is defined as :

col1 varchar(1) not null default ''

Does it means that col1's definition is equal to

col1 char(1) not null default ''


Put it another way, will char '' be saved as char(1) or char '' does not use space at all?

Thanks a lot,
Emi

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