MYSQL设置数学函数的最小/最大返回值的限制？

I have been searching, but all I find are answers on how to Find, not SET the maximum return value of a function.

我一直在寻找,但我找到的只是如何查找的答案,而不是设置函数的最大返回值。

What I am looking for is simple.. If I want to update the entries in a column in proportion to themselves.. say.. SET TheColumValue=(TheColumnValue+(TheColumnValue*0.5));

我正在寻找的是简单的..如果我想按照自己的比例更新列中的条目..说.. SET TheColumValue =(TheColumnValue +(TheColumnValue * 0.5));

Is there no MYSQL function to limit the resulting value?

是否没有MYSQL函数来限制结果值?

SET TheColumValue=FUNCTIONNAME(TheColumnValue+(TheColumnValue*0.5), MAXIMUMVALUE);

SET TheColumValue = FUNCTIONNAME(TheColumnValue +(TheColumnValue * 0.5),MAXIMUMVALUE);

I have written my own function to handle the need for now, but it seems to me such a simple, and obvious need that it would be part of the language. Am I just not finding it in the Ref. manual or does such a function actually not exist in MYSQL?

我已经编写了自己的函数来处理现在的需求,但在我看来,这是一个简单而明显的需求,它将成为语言的一部分。我只是在参考文献中找不到它。手动还是MYSQL中实际上不存在这样的功能?

1 个解决方案

#1

Of course there is. It is called LEAST():

当然有。它被称为LEAST():

SET TheColumValue = LEAST(TheColumnValue+(TheColumnValue*0.5), MAXIMUMVALUE)

More succinctly written as:

更简洁地写成:

SET TheColumValue = LEAST(TheColumnValue * 1.5, MAXIMUMVALUE)

#1