考试
1970-01-01 08:00:00

关系代数练习-学生选课(题干).docx 根据附件内容,查询

题目描述

关系代数练习-学生选课(题干).docx 根据附件内容,查询年龄在19到20岁之间的学生的姓名以及年龄/js/editor20150812/dialogs/attachment_new/fileTypeImages/icon_doc.gif

答案解析

select sName, sAge from student where sAge=19 or sAge=20; --- select sName, sAge from student where sAge between 19 and 20; --- select sName, sAge from student where sAge in (19, 20); --- select sName, sAge from student where sAge >=19 and sAge<=20;

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