runoob_tbl(
???runoob_id?INT?NOT?NULL?AUTO_INCREMENT,
???runoob_title?VARCHAR(100)?NOT?NULL,
???runoob_author?VARCHAR(40)?NOT?NULL,
???submission_date?DATE,
???PRIMARY?KEY?(?runoob_id?));這樣只是字段不能為null，但是可以是空白，怎么設(shè)置必須有值
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