Friday, June 26, 2020

PostgreSQL: Losing decimal digits when divide two numbers

In Postgresql

      select 4/100;

returns 0 instead of 0.04

There is more than one way to solve this problem.

A. select 4/100.0; 

It will return 0.04000000000000000000.

If you want to keep only x digits after the decimal points, use

     select round(4/100.0, x);

For example, select round(4/100.0, 2) will return 0.04.

B. select cast(4 as decimal)/100;

It will also return 0.04000000000000000000.

C. select cast(4 as float)/100;

This will return 0.04.

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