Question

我需要为下面的情况找到最好的两个算术表达式，但它仅返回第一个表达式的结果。在两个中没有得到最大的。请提出任何建议。

SELECT greatest((((Received*8) + (Received*56))/(1000*900*64000*900)),
                  (((Transmitted*8) + (Transmitted*56))/(1000*900*64000*900))) AS Greatest_value
FROM Table_name

我得到的结果：第一个表达式的算术exp结果

Answer 1

由于两个值的乘数相同，因此您可以将代码简化为：

SELECT GREATEST( Received, Transmitted ) * ( (8+56)/(1000*900*6400*900) )
         AS Greatest_value
FROM   table_name

或者只是：

SELECT GREATEST( Received, Transmitted ) / 810000000000
         AS Greatest_value
FROM   table_name

除此之外，您还需要检查数据：

SELECT COUNT( CASE WHEN Received >= Transmitted THEN 1 END ) AS received_greater,
       COUNT( CASE WHEN Received <  Transmitted THEN 1 END ) AS transmitted_greater
FROM   table_name;

oracle最大的两个算术表达式值

1 个答案: