1.文本处理函数
Upper(): 将文本转换为大写
如:
select h_title,upper(h_title) as up_title from h_info;
结果如下:
2.时间处理函数
时间相关的两种数据类型:
- date:只包含日期, 形如2020-01-02
- datetime:包含日期和时间,形如2020-02-02 00:00:00
例子:
Date()函数 :select * from h_info where Date(date) = “2020-02-03”;
Year()函数 :select * from h_info where Year(date) between “2010” and “2020”;
Day()函数 : select * from h_info where Day(date) = 3 and Month(date) = 2;
3.数值处理函数
来源:CSDN
作者:carry_1024
链接:https://blog.csdn.net/ycarry2017/article/details/104158828