mysql - adding columns with alter table error -

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ok i'm trying add these columns table says have syntax error, please let me know whats wrong

alter table equipomulti add  marca varchar(45) null , serie varchar(45) null , modelo varchar(45) null , fechaad date null , costo double null , observacion varchar(500) null ;

i believe need wrap multiple columns in parens, try:

alter table equipomulti add  (marca varchar(45), serie varchar(45), modelo varchar(45), fechaad date, costo double, observacion varchar(500)) ;

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