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Sum MySQL float datatype


peterjc

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I have a problem here.  When i try to sum the float number,  I does not get accurate answer.

 

For example:

 

20.5 + 10.8 = 31.3 (This is correct)

 

But if i use the Mysql Sum function to sum the two number, the answer is inaccurate, just for example, you may get 31.300000054

 

What is the problem and how to solve this problem?

 

thank

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