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删除sc中的全部记录  删除基本表sc  删除基本表sc中的列数据  删除基本表sc中的部分行  
SELECT S SNAME,SC.C#,GRADE FROM S WHERE S S#=SC.S#  SELECT S.SNAME,SC.C#,GRADE FROM SC WHRES S==SC.S#  SELECT S SNAME,SC.C#,GRADE FROM S.SC WHERE S.S#=SC.S#  SELECT S.SNAME.SC.C#,GRADE FROM S.SC WHERE SS#=SC.C#  
GRANT SELECT, UPDATE(gradON TABLE sc TO user1  GRANT SELECT sc, UPDATE sc, grade TO user1  GRANT SELECT, UPDATE ON TABLE s grade TO user1  GRANT SELECT ON TABLE sc, UPDATE ON TABLE sc(grad TO user1  
SELECT SNAME,AGE FROM S WHERE S.S#=(SELECT SC.S#}FROM SC WHERE C.C#='MATHS')  SELECT SNAME,AGEFROM SWHERE S.S#=(SELECT SC.S#}FROM SC WHERE SC.C#='MATHS')  SELECT SNAME,AGE FROM S, SC WHERE S.S#=SC.S# AND SC.C#='MATHS' ORDER BY S.S#  SELECT SNAME,AGE FROM S, SC WHERE S.S#=SC.S# AND SC.C#='MATHS'  
线路输入的信号、送往线路的信号  送往线路的信号、合波放大后信号  送往SC1或SC2的信号、由SC1或SC2来的信号  由SC1或SC2来的信号、送往SC1或SC2的信号  
SC-APC的光纤端面是呈8°斜角的,而SC-UPC的光纤端面是平面  SC-APC与SC-UPC直接对接会增加3dB的衰减,且容易损坏光纤端面  SC-APC型光纤跳线主要用于广播电视领域(光纤CATV),因为其可有效回波损耗小  都是SC型,所以SC-APC插头的光纤跳线可以用于SC-UPC光接口的ONU连接;  
SELECT S.SN,SC.C#,SC.GRADE
FROMS
WHERE S.S#=SC.S#  
SELCECT S.SN,SC.C#,SC.GRADE
FROM SC
WHERE S.S#=SC.GRADE  
SELECT S.SN,SC.C#,SC,GRADE
FROM S,SC
WHERE S.S#:SC.S#  
SELSECT S.SN,SC.C#,SC.GRADE
FROM S,SC  
SC/APC接头的断面有8°的斜面,SC/UPC接头的断面为直角  SC/APC接头的断面为直角,SC/UPC接头的断面为8°斜面  SC/APC接头的断面有15°的斜面,SC/UPC接头的断面为直角  SC/APC接头的断面有8°的斜面,SC/UPC接头的断面为15°斜面  
GRANT SELECT sc.UPDATE sc.grade TO user  GRANT SELECT,UPDATE(grade)ON TABLE sc TO user  GRANT SELECT,UPDATE ON TABLE sc.grade TO user  GRANT SELECT ON TABLE sc,UPDATE ON TABLE sc(grade)TO user  
GRANT SELECT,UPDATE(grade)ON TABLE sc TO user1  GRANT SELECT sc,UPDATE sc,grade TO user1  GRANT SELECT,UPDATE ON TABLE sc.grade TO user1  GRANT SELECT ON TABLE sc,UPDATE ON TABLE sc(grade)TO user1  
SELECT S.姓名,SC.课程号,SC.成绩FROM S WHERES.学号=SC.学号  SELECT S.姓名,SC.课程号,SC.成绩FROM SC WHERES.学号=SC.成绩  SELECT S.姓名,SC.课程号,SC.成绩FROM S,SC WHERE S.学号=SC.学号  SELECT S.姓名,SC.课程号,SC.成绩FROM S,SC  
GRANT GRADE ON SC TO ZHAO  GRANT UPDATE ON SC TO ZHAO  GRANT UPDATE (GRADE) ON SC TO ZHAO  GRANT UPDATE ON SC (GRADE) TO ZHAO  
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