单项选择题

A．ZB
B．GB
C．GB/T
D．QB
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单项选择题
A．物理层B．数据链路层C．网络层D．传输层
A．物理层
B．数据链路层
C．网络层
D．传输层
单项选择题
A．SELECT DISTINCT Sname FROMS WHERE EXISTS (SELECT* FROM SPJ WHERE S. Sno=SPJ. SnO AND SPJ.Pno=’P3’)B．SELECT DISTmCT Sname FROMS WHERE 0＜ (SEIECT COUNT (*) FROM SPJ WHERES.Sno=SPJ.Sno AND SPJ.Pno=’P3’)C．SELECT Sname FROMS WHERE EXISTS (SELECT* FROM SPJ WHERES.Sno=SPJ.Sno ANDSPJ.Pno=’P3’)D．SELECT Sname FROMS，SPJ WHERES.Sno=SPJ.Sno ANDSPJ.Pno=’P3’) GROUP BYSname
A．SELECT DISTINCT Sname
FROMS
WHERE EXISTS
(SELECT*
FROM SPJ
WHERE S. Sno=SPJ. SnO
AND SPJ.Pno=’P3’)
B．SELECT DISTmCT Sname
FROMS
WHERE 0＜
(SEIECT COUNT (*)
FROM SPJ
WHERES.Sno=SPJ.Sno
AND SPJ.Pno=’P3’)
C．SELECT Sname
FROMS
WHERE EXISTS
(SELECT*
FROM SPJ
WHERES.Sno=SPJ.Sno
ANDSPJ.Pno=’P3’)
D．SELECT Sname
FROMS，SPJ
WHERES.Sno=SPJ.Sno
ANDSPJ.Pno=’P3’)
GROUP BYSname
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