sql中的trunc和round函数 [英] trunc and round function in sql

问题描述

用否定参数将trunc和round取整吗?

Is trunc and round the same with negative arguments?

       SQL> select round(123456.76,-4) from dual;

        ROUND(123456.76,-4)
         -------------------
         120000

         SQL> select trunc(123456.76,-4) from dual;

          TRUNC(123456.76,-4)
          -------------------
         120000

推荐答案

否，行为取决于有效数字的值(在您的情况下，第3个数字(3)是有效数字，因为它低于5 round和trunc相同)

No, behavior depends on the value of the significant digit (the 3rd digit (the 3) is the significant one in your case, as it is below 5 round and trunc do the same )

尝试select trunc(125456.76,-4) from dual(结果为120000)与select round(125456.76,-4) from dual(结果为130000).现在，当有效数字为5(或更高)时，trunc和round的结果将不同.

try select trunc(125456.76,-4) from dual (result is 120000) vs select round(125456.76,-4) from dual (result is 130000). Now when the significant digit is 5 (or higher) the results of trunc and round differ.

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