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搜题
【单选题】
设矩阵 ． 已知矩阵A相似于矩阵B，则秩(A-2E)与秩(A-E)之和等于A.
2
B.
3
C.
4
D.
5
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举一反三
【单选题】删除计算机系学生(在student表中)的修课记录(在SC表中)的语句，正确的是( )。
A.
DELETE FROM SC JOIN Student b ON S.Sno=b.Sno a) WHERE Sdept = '计算机系'
C.
DELETE FROM SC FROM SC JOIN Student b ON SC.Sno=b.Sno a) WHERE Sdept = '计算机系' C.DELETE FROM Student WHERE Sdept = ' 计算机系'
D.
DELETE FROM SC WHERE Sdept = '计算机系'
【单选题】删除计算机系学生(在student表中)的修课记录(在sc表中)的正确的SQL语句是_____。
A.
delete from sc join student b on sc.sno=b.sno where sdept = '计算机系'
B.
delete from sc where sno in (select sno from student where sdept = '计算机系')
C.
delete from sc where sno = (select sno from student where sdept = '计算机系')
D.
delete from sc where sdept = '计算机系'
【简答题】删除计算机系学生(在student表中)的修课记录(在SC表中)的语句,正确的是( )。A. DELETE FROM SC JOIN Student b ON S.Sno = b.Sno WHERE Sdept = '计算机系' 不正确 B. DELETE FROM SC FROM SC JOIN Student b ON SC.Sno = b.Sno WHERE Sdept = '计算机系...
【多选题】删除计算机系学生(在 student 表中)的修课记录(在 SC 表中)的正确的语句是( )
A.
DELETE FROM SC JOIN Student b ON S.Sno = b.Sno WHERE Sdept = ' 计算机系 '
B.
DELETE FROM SC FROM SC JOIN Student b ON S
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