(46)A long-held view of the history of the English colonies that became the United States has bee...

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以下九道小题使用的数据表如下当前盘当前目录下有数据库大奖赛dbc其中有数据库表歌手dbf评分db

DELETE myview VIEW DELETE myview DROP myview VIEW DROP VIEW myview

为视图重命名的命令是

MODIEY VIEW CREATE VIEW DELETE VIEW RENAME VIEW

建立一个视图salary该视图包括了系号和该系的平均工资两个字段正确的SQL语句是【】

CREATE VIEW salary AS系号,AVG(工资)AS平均工资 FROM 教师；GROUP BY系号 CREATE VIEW salary AS SELECT系号,AVG(工资)AS平均工资FROM教师；GROUP BY系号 CREATE VIEW salary SELECT系号,AVG(工资)AS平均工资FROM教师；GROUP BY系号 CREATE VIEW salary AS SELECT系号,AVG(工资)AS平均工资FROM教师；GROUP BY系号

为视图重命名的命令是

MODIFY VIEW CREATE VIEW DELETE VIEW RENAME VIEW

将amolNa和amolAl一同投入mg足量水中所得溶液密度为dg·㎝－3该溶液的质量分数为

82a /（46a + m）% 82a /（69a + 2m）% 8200a /（46a + m）% 8200a /（69a +2 m）%

Manager:MayIhelpyouMadam?Customer:YesI’msorrytotro

杂交水稻亲本冈46A是

不育系保持系恢复系自交系

Directions: Writeanessayof160—200wordsbasedonthef

修改本地视图的命令是

OPEN VIEW CREATE VIEW USE VIEW MODIFY VIEW

Java语言的类间的继承关系是

MODIFY VIEW CREATE VIEW DELETE VIEW RENAME VIEW