单项选择题
A.select round(v_time,’DAY’) from dual B.select round(v_time,’YEAR’) from dual C.select round(v_time,’MONTH’) from dual D.A select round(to_char(v_time,’yyyy’)) from dual
如下语句:select i.id_number, m.id_number from inventory i, ...
如下语句:select i.id_number, m.id_number from inventory i, manufacturer m where i.manufacturer_id = m.id_number order by inventory.description 执行是错误的,请问以下措施哪个能够改正这个错误? ()
A.在order by字句中使用表的别名 B.where 字句中去掉表的别名 C.where字句中用表名代替表的别名 D.order by字句中去掉表名,只要字段名称即可
用truncate和delete语句删除表中数据的区别()A.truncate 命令不记录日志B.trunca...
单项选择题用truncate和delete语句删除表中数据的区别()
A.truncate 命令不记录日志 B.truncate 命令记录日志 C.delete命令不记录日志
存在两个结构相同的数据库表T1(col1,col2,col3)、T2(col1,col2,col3),写出一S...
单项选择题存在两个结构相同的数据库表T1(col1,col2,col3)、T2(col1,col2,col3),写出一SQL语句将所有T1数据导入到T2表()
A.select col1,col2,col3 from T1 into T2(col1,col2,col3) B.insert T1 (col1,col,col3) into T2(col1,col2,col3) C.insert into T2 (col1,col2,col3) as select col1,col2,col3 from T1 D.insert into T2(col1,col2,col3) select col1,col2,col3 from T1;