运维工做平常积累

#截取数字数据库 SELECT  TRUNC(15.79,1) "Truncate" FROM DUAL;  //15.79取一位小数，得15.7 SELECT ROUND(15.75, 1) rounded , ROUND(15.71,1) truncated from dual  //四舍五入 SELECT FLOOR(ROUND(15.79, 0)), FLOOR(ROUND(15.79,

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