获取当前登录服务器的主机地址及用户名使用（）函数。 A: USER() B: SYSTEM_USER() C: SESSION_USER() D: CURRENT_USER()

β is the ratio of _____. A: collector current to emitter current B: base current to collector current C: collector current to base current D: emitter current to collector current

The current ratio is measured as: A: current assets minus current liabilities. B: current assets divided by current liabilities. C: current liabilities minus inventory, divided by current assets. D: cash on hand divided by current liabilities. E: current liabilities divided by current assets.

将字段User改为user需要编写| rename User user

函数CURRENT_USER()可获取与当前通过MySQL服务器验证的用户与主机名。

The quick ratio is measured as: A: current assets divided by current liabilities. B: cash on hand plus current liabilities, divided by current assets. C: current liabilities divided by current assets, plus inventory. D: current assets minus inventory, divided by current liabilities. E: current assets minus inventory minus current liabilities.

已知,存在 QueryRunner对象 runner , SQL语句: String sql = "select * from user where id=?"; 下面操作中,能实现查询指定记录的选项是() A: User user=(User)runner.query(sql, new BeanListHandler(User.class), new Object[]{id}); B: User user=(User)runner.query(sql, new BeanHandler(User.class)); C: User user=(User)runner.query(sql, new BeanListHandler(User.class), id); D: User user=(User)runner.query(sql, new BeanHandler(User.class), new Object[]{id});

Current liabilities are ______ from current assets to give net current assets.

request.setAttribute("user","svse");session.setAttribute("user","bob");使用{user}则显示( )

下面哪个系统函数可以返回返回系统用户名?() A: HOST_ID B: HOST_NAME C: SYSTEM_USER D: CURRENT_USER