delect from score where 学号=2009 and 课程名=政治delect from score where 学号=2009 and 课程名=政治 意思是什么?
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delect from score where 学号=2009 and 课程名=政治delect from score where 学号=2009 and 课程名=政治 意思是什么?
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indirect quesitons from wh-question怎么翻译?
sql语句:去掉最大值,去掉最小值,算平均值SELECT AVG(Scores.Score)FROM ScoresWHERE ( ( (Scores.[ID]) = @id)AND (Score < (SELECT MAX(Score) From Scores WHERE Scores.[ID] = @id) )AND (Score > (SELECT MIN(Score) From Scores WHERE Scores.[I
why you delect your message什么意思
这段文字的意思update student set grade = ( select grade from ( select id, case when score> 90 then 'a' when score > 80 then 'b' when score > 70 then 'c' else 'd' end grade from student ) a
关于SQL语句里面的A.XX,和B.select B.kecheng,B.score,B.xuehaofrom(select kecheng ,max(score) AS score from jiaScore group by kecheng) A,jiaScore Bwhere A.kecheng = B.kechengand A.score = B.score例如我这段数据库语句,A.kecheng和B.keche
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