Mysql数据库基础知识点（函数，视图）/四

mysql常见函数总结 数值函数 绝对值 select abs(-3) from dual; 向下取整 select floor(3.456) from dual; 向上取整 select ceil(3.1) from dual; 拼接字符串 select concat('hello','world') from dual; 查看数据库 select database() from dual; 查

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