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MySQL(基础篇)之MySQL函数(数学函数)

Jun 07, 2016 pm 03:03 PM
absmysqlInstructions for usefunctionBasemath

一、数学函数 函数ABS(X) 函数使用说明:返回X的绝对 函数ACOS(X) 函数使用说明:返回X反余弦,即,余弦是X的。若X不在-1到1的范围之内,则返回NULL。 函数ASIN(X) 函数使用说明:返回X的反正弦,即,正弦为X的。若X若X不在-1到1的范围之内,则返回NULL 函数

一、数学函数

       函数ABS(X)

       函数使用说明:返回X 的绝对值
MySQL(基础篇)之MySQL函数(数学函数)

             函数ACOS(X )

             函数使用说明:返回X 反余弦, 即, 余弦是X 的值。若X 不在-1 到1 的范围之内,则返回NULL 。

 

               函数ASIN (X )

              函数使用说明:返回X 的反正弦,即,正弦为X 的值。若X   若X 不在-1 到1 的范围之内,则返回NULL 

MySQL(基础篇)之MySQL函数(数学函数)

                函数ATAN(X )
               函数使用说明:返回X 的反正切,即,正切为X 的值。

  MySQL(基础篇)之MySQL函数(数学函数)
                函数ATAN(Y ,X ) , ATAN2(Y ,X )
                函数使用说明:返回两个变量X 及Y 的反正切。它类似于Y 或X 的反正切计 算, 除非两个参数的符号均用于确定结果所在象限。


                函数CEILING(X ) CEIL(X )
               函数使用说明:返回不小于X 的最小整数值。

MySQL(基础篇)之MySQL函数(数学函数)
 

                    函数COS(X )
                   函数使用说明:返回X 的余弦,其中X 在弧度上已知。

MySQL(基础篇)之MySQL函数(数学函数)

  
               函数COT(X )
               函数使用说明:返回X 的余切

               函数CRC32(expr )

               函数使用说明:计算循环冗余码校验值并返回一个32 比特无符号值。若参数为NULL ,则结果为NULL 。该参数应为一个字符串,而且在不是字符串的情况下会被      作为字符串处理(若有可能)

MySQL(基础篇)之MySQL函数(数学函数)


函数DEGREES(X )

函数使用说明:返回参数X , 该参数由弧度被转化为度。


函数EXP(X )
函数使用说明:返回e 的X 乘方后的值( 自然对数的底) 。

MySQL(基础篇)之MySQL函数(数学函数)
 函数FLOOR(X )
函数使用说明:返回不大于X 的最大整数值。
MySQL(基础篇)之MySQL函数(数学函数)

 函数FORMAT(X ,D )
函数使用说明:将数字X 的格式写成'#,###,###.##' 格式, 即保留小数点后D 位,而第D 位的保留方式为四舍五入,然后将结果以字符串的形式返回

MySQL(基础篇)之MySQL函数(数学函数)
   函数LN(X )
   函数使用说明:返回X 的自然对数, 即, X 相对于基数e 的对数

MySQL(基础篇)之MySQL函数(数学函数)


 函数LOG(X ) LOG(B ,X )
函数使用说明:若用一个参数调用,这个函数就会返回X 的自然对数。

 函数LOG2(X )
函数使用说明:返回X 的基数为2 的对数。


MySQL(基础篇)之MySQL函数(数学函数)


  函数LOG10(X )
函数使用说明:返回X 的基数为10 的对数。


 函数MOD(N ,M ) , N % M N MOD M
函数使用说明:模操作。返回N 被M 除后的余数。
MySQL(基础篇)之MySQL函数(数学函数)


 函数PI()
函数使用说明:返回?(pi) 的值。默认的显示小数位数是7 位, 然而MySQL 内部会使用完全双精度值。
MySQL(基础篇)之MySQL函数(数学函数)



    函数POW(X ,Y ) , POWER(X ,Y )
    函数使用说明:返回X 的Y 乘方的结果值。


     函数RADIANS(X )

     函数使用说明:返回由度转化为弧度的参数X , ( 注意?弧度等于180 度)。

MySQL(基础篇)之MySQL函数(数学函数)

     函数RAND() RAND(N )

     函数使用说明:返回一个随机浮点值v ,范围在0 到1 之间( 即, 其范围为0 ≤v ≤1.0) 。若已指定一个整数参数N ,则它被用作种子值,用来产生重复序列。


      函数ROUND(X ) ROUND(X ,D )

      函数使用说明:返回参数X , 其值接近于最近似的整数。在有两个参数的情况下,返回X ,其值保留到小数点后D 位,而第D 位的保留方式为四舍五入。若要接保留X 值小数点左边的D 位,可将D 设为负值

       函数SIGN(X )

       函数使用说明:返回参数作为-1 、0 或1 的符号,该符号取决于X 的值为负、零或正。

MySQL(基础篇)之MySQL函数(数学函数)


        函数SQRT(X )

        函数使用说明:返回非负数X 的二次方根。

MySQL(基础篇)之MySQL函数(数学函数)


       函数TAN(X )

      函数使用说明:返回X 的正切,其中X 在弧度中被给定。


      函数TRUNCATE(X ,D )

      函数使用说明:返回被舍去至小数点后D 位的数字X 。若D 的值为0, 则结果不带有小数点或不带有小数部分。可以将D 设为负数, 若要截去( 归零) X 小数点左起第D 位开始后面所有低位的值


      



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