full of error or little mistake ![readerID] [char] (10) COLLATE Chinese_PRC_CI_AS not NULL unique , [readerName] [char] (25) COLLATE Chinese_PRC_CI_AS not NULL , [sex] [char]why use char to decorate readerid ? why not use varchar instead of [readerName] [char]
[readerName] [char] (25) COLLATE Chinese_PRC_CI_AS not NULL ,
[sex] [char]why use char to decorate readerid ?
why not use varchar instead of [readerName] [char]