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Divisão não inteira SQL postgres

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Baderous

Vê este exemplo:

As an example of mathematical operators in the target list, the statement in Example 5-9 takes the retail price for each book and divides the cost with the / operator in order to determine the profit margin. This value is then typecast to a truncated numeric value with only two digits of precision. Finally, the integer constant 1 is subtracted from the division result, to yield only the percentage points over 100.

http://www.faqs.org/docs/ppbook/c7547.htm#USINGMATHEMATICALOPERATORS

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