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  • Oracle四舍五入,向上取整,向下取整

    取整(向下取整)
    select floor(5.534) from dual;
    select trunc(5.534) from dual;
    上面两种用法都可以对数字5.534向下取整,结果为5.
    
    如果要向上取整 ,得到结果为6,则应该用ceil
    select ceil(5.534) from dual;
     
    四舍五入
    SELECT round(5.534) FROM dual;
    SELECT round(5.534,0) FROM dual;
    SELECT round(5.534,1) FROM dual;
    SELECT round(5.534,2) FROM dual;
    结果分别为 6,  6,  5.5,  5.53
     
    
    保留N位小数(不四舍五入)按位数截取
    select trunc(5.534,0) from dual;
    select trunc(5.534,1) from dual;
    select trunc(5.534,2) from dual;
    结果分别是 5,5.5,5.53,其中保留0位小数就相当于直接取整了。
     
    
    数字格式化
    select to_char(12345.123,'99999999.9999') from dual;
    结果为12345.123
    
    select to_char(12345.123,'99999999.9900') from dual;
    小数后第三第四为不足补0,结果为12345.1230
    
    select to_char(0.123,'99999999.9900') from dual;
    select to_char(0.123,'99999990.9900') from dual;
    结果分别为 .123, 0.123
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  • 原文地址:https://www.cnblogs.com/nietzsche2019/p/11056813.html
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