【单选题】幼儿边搭积木边说:"这个太小了。”这是一种( )
【单选题】幼儿边搭积木边说:“这个太小了”这是一种
【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'
【单选题】与固溶体相比,金属间化合物的性能特点是( )
【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...
【单选题】与固溶体相比,金属间化合物的性能特点是( )。
【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