This should be familiar to people who make a habit of watching the election returns roll in… you get the first substantial votes at 7, a big chunk at 8, and they trickle in over the rest of the night. (In presidential years the 11:00 chunk isn’t as interesting as you’d expect ...
2. 处理NULL NVL函数可把NULL转换成其它类型的符号 编程技巧: NVL函数在多条件模糊查询的时候比较有用 NVL函数可返回多种数据类型: 返回日期 NVL(start_date,'2002-02-01') 返回字符串 NVL(title,'no title') 返回数字 NVL(salary,1000) 3. 使用SQL*PLUS SQL> desc table; 显示表结构 SQL> select * fr...