维生素B6是________衍生物，也称吡哆素，有_______，_______，_______三种形式，可以以_______，_______的形式作为氨基酸_______，_______，_______的辅酶。
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生物素可看成由_______，_______，________三部分组成，是_______的辅酶，在_______的固定中起重要作用。
查询计算机系任意学生选修过的课程号，不正确的查询语句是：
A. SELECT DISTINCT CnoFROM SCWHERE NOT EXISTS (SELECT SnoFROM StudentWHERE Sdept = 'CS'AND SC.Sno = Student.Sno);
B. SELECT DISTINCT CnoFROM SCWHERE EXISTS (SELECT SnoFROM StudentWHERE Sdept = 'CS'AND SC.Sno = Student.Sno);
C. SELECT DISTINCT CnoFROM SCWHERE Sno IN (SELECT SnoFROM StudentWHERE Sdept = 'CS');
D. SELECT DISTINCT CnoFROM SCLEFT JOIN StudentON SC.Sno = Student.SnoWHERE Sdept = 'CS';
查询学号为201215121的同学选修过的所有课程的名字，不正确的查询语句是：
A. SELECT CnameFROM CourseLEFT JOIN SCON Course.Cno = SC.CnoWHERE Sno = '201215121';
B. SELECT CnameFROM CourseWHERE Cno IN (SELECT CnoFROM SCWHERE Sno = '201215121');
C. SELECT CnameFROM CourseWHERE EXISTS (SELECT *FROM SCWHERE SC.Cno = Course.CnoAND Sno = '201215121');
D. SELECT CnameFROM CourseWHERE NOT EXISTS (SELECT *FROM SCWHERE SC.Cno = Course.CnoAND Sno = '201215121');
查询非计算机系中比计算机系中年龄最小者年龄大或相等的学生姓名，不正确的查询语句是：
A. SELECT SnameFROM Student S1WHERE NOT EXISTS (SELECT *FROM Student S2WHERE S2.Sdept = 'CS'AND S1.Sage < S2.Sage)AND Sdept != 'CS';
B. SELECT SnameFROM Student S1WHERE EXISTS (SELECT *FROM Student S2WHERE S2.Sdept = 'CS'AND S1.Sage >= S2.Sage)AND Sdept != 'CS';
C. SELECT SnameFROM StudentWHERE Sage >= (SELECT MIN(Sage) FROMStudentWHERE Sdept = 'CS')AND Sdept != 'CS';
D. SELECT SnameFROM StudentWHERE Sage >= ANY (SELECT SageFROM StudentWHERE Sdept = 'CS')AND Sdept != 'CS';
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