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SC.G＞＝'B' SC.G＜＝'B' SC.G＞'B' SC.G＜'B'
SC. C＞'B' SC. C＜='B' SC. G≥'B' SC. G≤'B'
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
SC.G＞='B' SC.G＜='B' SC.G＞'B' SC.G＜'B'
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
SC.G＞＝'B' SC.G＜＝'B' SC.G＞'B' SC.G＜'B'
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
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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
SC.G>='B' SC.G<='B' SC.G>'B' SC.G<'B'
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
SC.G＞='B' SC.G＜='B' SC.G＞'B' SC.G＜'B'
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