ERROR: value out of range: underflow in numeric log calculation

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От Gallacher Neil
Тема ERROR: value out of range: underflow in numeric log calculation
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Msg-id CWLP265MB5906D3545378C97AADA62BE3DEBBA@CWLP265MB5906.GBRP265.PROD.OUTLOOK.COM
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Ответы Re: ERROR: value out of range: underflow in numeric log calculation  (Tom Lane <tgl@sss.pgh.pa.us>)
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Hi,

 

When executing log calculations (example below):

 

SELECT 1.0 * exp(-1.0 *(ln(2) * (1695993520/86400.0)) / 0.04) AS result_test;

 

The following error occurs.

 

ERROR: value out of range: underflow

 

I can find no way around this other than to wrap the calculation in a function with

 

exception when numeric_value_out_of_range then return 0;

 

However performance is impacted when performing calculations on multiple rows with a function call.

 

I can however understand that an individual might wish to know that the result of a calculation cannot be represented by the system due to its small value however I don’t believe it should be the default behaviour.

 

Thank you,

 

Neil Gallacher

 

Analyst/Programmer

 

 

 

 

 

 

 

 

 


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