Mysql數據庫基礎知識點（函數，視圖）/四

mysql常見函數總結 數值函數 絕對值 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; 查看數據庫 select database() from dual; 查

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