How MySQL deletes a column in a database table

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Delete a column in the database table

Mysql Delete column , Add columns sql sentence

Delete a column in the database table

Delete the value of a field

update table_name SET field_name = '';

Delete a column

ALTER TABLE table_name DROP COLUMN field_name;Mysql Delete column , Add columns sql sentence

There is a watch actor, And contains columns last_name

-- Delete column , Either way alter table actor drop  column last_name;alter table actor drop last_name;-- Add columns , You must specify the type of column alter table actor add last_name varchar(10);

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